PATENT DOCUMENT

Abstract:
A basic cell comprises a memory cell capable of retaining data having at least a binary value, a first selecting transistor connected between a first terminal of the memory cell and the Mth bit line, and a second selecting transistor connected between the first terminal of the memory cell and the M+1th bit line. Agate of the first selecting transistor is connected to the 2·N−1th selecting line, and a gate of the second selecting transistor is connected to the 2·Nth selecting line.

Full Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a semiconductor memory device, more specifically to a semiconductor memory device for reading memorized data by setting a voltage of a bit line to a predetermined voltage. 
     2. Description of the Related Art 
     In a memory cell array constituted in a conventional manner, it is necessary to pre-charge a voltage of a bit line selected in accordance with an inputted address to a predetermined voltage when data in the memory cell is read. In addition, it is necessary to reset the voltage of the bit line to an initial voltage after the data in the memory cell is judged with a sense amplifier. In order to do treatment described above, it is further necessary to wait for a predetermined length of time (in other words, pre-charge the voltage of the bit line) until the data in the memory cell is decided with the sense amplifier after the address is inputted, and also to wait for a predetermined length of time until the data in the next memory cell is read after the data in the current memory cell is decided with the sense amplifier (in other words, reset the voltage of the bit line after reading the data to the initial voltage). Further, it is necessary to wait for a predetermined length of time (in other words, pre-charge the voltage of the bit line) even if it is not after the address is inputted but, for example, it is a reading sequence like pre-charging the voltage of the bit line due to a falling edge of a clock signal. Because of the reason described above, it is not possible to randomly read the data at a high speed. 
     The problem is generated regardless of the constitution and format of the memory cell. A similar problem is also generated in memory cells in which it is necessary to set the voltage of the bit line before and after the reading operation (including NAND type, AND type, Pch type, Depression type, resistance-variable nonvolatile memory (RRAM) and capacitor) other than an NOR memory cell and a VGA memory cell. 
     The constitution recited in No. 2003-529880 of the Japanese Patent Applications Laid-Open was proposed in order to solve the problem. According to the cited document, the memory array comprises at least two banks provided with a sense amplifier independently operating, wherein data is alternately read from the respective banks. Accordingly, the bit-line voltage of the memory cell in one of the banks can be reset and pre-charged while the data is being read from the memory cell in the other bank. As a result, it becomes unnecessary to wait until the voltage of the bit line is set before the data can be read from the next memory cell, which enables to read at high speed. 
     The foregoing constitution is effective when the data is serially read, however, after the data in the memory cell in one of the banks is read, it is necessary to read the data from the memory cell in the other bank. Due to the disadvantage, it is still not possible to start to read the data in the next memory cell until the pre-charge and reset of the bit-line voltage are completed in the case where the data in the memory cells in the same bank is randomly read in succession, in particular, in the case where the data in the memory cells present on the same bit line in the same bank. As described, even in the conventional constitution which was improved, it still requires the time for setting the bit-line voltage when the data is read from the memory cell, thereby it is difficult to randomly read the data at a high speed. 
     SUMMARY OF THE INVENTION 
     Therefore, a main object of the present invention is to provide a semiconductor memory device capable of randomly reading data at a high speed without waiting until a voltage of a bit line is set. 
     In order to achieve the foregoing object, a semiconductor memory device according to the present invention comprises a memory cell array comprising a single or a plurality of basic cells, and selecting lines, bit lines and word lines provided respectively for designating the basic cells, wherein
         the basic cell includes:   a memory cell capable of retaining data having at least a binary value, provided that N and M are respectively integers of at least one;   a first selecting transistor connected to between a first terminal of the memory cell and the Mth bit line; and   a second selecting transistor connected to between the first terminal of the memory cell and the M+1th bit line, wherein   a gate of the first selecting transistor is connected to the 2·N−1th selecting line, and a gate of the second selecting transistor is connected to the 2·Nth selecting line.       

       FIGS. 7 and 8  in preferred embodiments described later can be referenced with respect to the foregoing constitution. 
     According to the foregoing constitution, first and second memory cells are provided as the memory cell. In the case where the first selecting transistor of the first memory cell is turned on, data of the first memory cell is read from the first bit line connected to the first selecting transistor, and when the second memory cell whose data is subsequently read is connected to the first bit line which is the same as the before-mentioned bit line, the first selecting transistor of the first memory cell can be turned off immediately after the data in the first memory cell is read, the second selecting transistor of the second memory cell can be turned on while a voltage of the first bit line is being set, and data of the second memory cell can be read from the second bit line connected to second selecting transistor. 
     As a result of the foregoing constitution, when the data in the memory cells connected to the same bit line is continuously read in at least one Pch non-volatile memory, depression non-volatile memory and a memory cell in which it is unnecessary to pre-charge the bit-line voltage to a predetermined voltage before the reading operation, the data in the next memory cell can be read while the bit-line voltage is being reset after the reading operation. As a result, the data can be randomly read at a high speed. 
     It is preferable that the memory cell array is configured in such a manner that a common line is used as the 2·Nth selecting line and the 2·N+1th selecting line, and controllable by only the selected word line. It shows that the common selecting line can be used in the constitution according to the present invention within such a range that the foregoing operation effect is inhibited.  FIGS. 10 and 11  in the preferred embodiments described later can be referenced with respect to the foregoing constitution. 
     According to the foregoing constitution, for example, in the case where the first selecting transistor of the first memory cell is turned on, the data of the first memory cell is read from the first bit line connected to the first selecting transistor, and the second memory cell whose data is subsequently read is connected to the first bit line which is the same as the before-mentioned bit line, the data of the second memory cell can be read from the second bit line immediately after the data of the first memory cell is read by means of a fewer number of selecting transistor control lines. 
     As a result of the foregoing constitution, when the data in the memory cells connected to the same bit line is continuously read in the memory cells in which it is unnecessary to pre-charge the bit-line voltage to a predetermined voltage before the reading operation, the effect of the present invention can be exerted by means of a fewer number of selecting transistor control lines. 
     A semiconductor memory device according to the present invention comprises a memory cell array comprising a single or a plurality of basic cells, and selecting lines, bit lines and word lines provided respectively for designating the basic cells, wherein
         the basic cell includes:   first and second memory cells capable of retaining data having at least a binary value, provided that N and M are respectively integers of at least one;   a first selecting transistor connected to between a first terminal of the first memory cell and the Mth bit line;   a second selecting transistor connected to between the first terminal of the first memory cell and the M+1th bit line,   a third selecting transistor connected between a first terminal of the second memory cell and the M+1th bit line; and   a fourth selecting transistor connected to between the first terminal of the second memory cell and the M+2th bit line, and, wherein   a gate of the first selecting transistor is connected to the 2·N−1th selecting line,   a gate of the second selecting transistor is connected to the 2·Nth selecting line,   a gate of the third selecting transistor is connected to the 2·N+1th selecting line,   a gate of the fourth selecting transistor is connected to the 2·N+2th selecting line, and   only the selected word line is controllable.       

       FIGS. 13 and 14  in the preferred embodiments described later can be referenced with respect to the foregoing constitution. 
     According to the foregoing constitution, for example, in the case where the first selecting transistor of the first memory cell is turned on, the data of the first memory cell is read from the first bit line connected to the first selecting transistor, and the second memory cell whose data is subsequently read shares the same bit line with the first memory cell, the data of the second memory cell can be read from the second bit line connected to the second selecting transistor through the steps described below, during a period when the data of the first memory cell is read:
         the bit line connected to the second selecting transistor of the second memory cell is pre-charged to a predetermined voltage.   the first selecting transistor of the first memory cell is turned off immediately after data of the first memory cell is read.   the second selecting transistor of the second memory cell is turned on while the voltage of the first bit line is being reset.       

     As a result of the foregoing constitution, even in the case where the data of the memory cells connected on the same bit line is continuously read in the memory cells capable of controlling only the selected word line (including at least one Nch non-volatile memory and Pch non-volatile memory capable of controlling only the selected word line), the voltage of the bit line in the next memory cell can be pre-charged while the data of the current memory cell is being read, or the data of the next memory cell can be read while the voltage of the bit line is being reset after the data of the current memory cell is read when the data of the memory cells connected on the same bit line is continuously read. As a result, the data can be randomly read at a high speed. 
     A semiconductor memory device according to the present invention comprises a memory cell array comprising a single or a plurality of basic cells, and selecting lines, bit lines and word lines provided respectively for designating the basic cells, wherein
         the basic cell includes:   a first through fourth memory cells capable of retaining data having at least a binary value, provided that N and M are respectively integers of at least one;   a first selecting transistor connected to between a first terminal of the first memory cell and the 2·M−1th bit line;   a second selecting transistor connected between the first terminal of the first memory cell and the 2·Mth bit line,   a third selecting transistor connected between a first terminal of the second memory cell and a first terminal of the fourth memory cell, and the 2·Mth bit line;   a fourth selecting transistor connected between the first terminal of the second memory cell and the first terminal of the fourth memory cell, and the 2·M+1th bit line;   a fifth selecting transistor connected between a first terminal of the third memory cell and the 2·M−1th bit line; and   a sixth selecting transistor connected to the first terminal of the third memory cell and the 2·Mth bit line, and wherein   a gate of the first selecting transistor is connected to the 4·N−3th selecting line,   a gate of the second selecting transistor is connected to the 4·N−2th selecting line,   a gate of the third selecting transistor is connected to the 4·N−1th selecting line,   a gate of the fourth selecting transistor is connected to the 4·Nth selecting line,   a gate of the fifth selecting transistor is connected to the 4·N+1th selecting line, and   a gate of the sixth selecting transistor is connected to the 4·N+2th selecting line.       

       FIGS. 16 and 17  in the preferred embodiments described later can be referenced with respect to the foregoing constitution. 
     As a result of the foregoing constitution, in the case where the data of the memory cells connected to the same bit line is continuously read in the memory cells capable of controlling only the selected word line (including at least one Nch non-volatile memory and Pch non-volatile memory controllable by only the selected word line), the voltage of the bit line in the next memory cell can be pre-charged while the data of the current memory cell is being read by means of less load of control line. In addition, the data of the next memory cell can be read while the voltage of the bit line is being reset after the data of the memory cell is read. As a result, the data can be randomly read at a high speed. 
     It is preferable that the memory cell array is configured in such a manner that a common line is used as the 4·N−2th selecting line and the 4·N+1th selecting line, a common line is used as the 4·Nth selecting line and the 4·N+3th selecting line, and only the selected word line is controllable. 
     This shows that the common selecting line can be used in the constitution according to the present invention in such a range that the foregoing effect is not disturbed to be exerted.  FIGS. 19 and 20  in the preferred embodiments described later can be referenced with respect to the foregoing constitution. 
     According to this, even in the case where the data of the memory cells connected to the same bit line is continuously read in the memory cells capable of controlling only the selected word line, the bit line in the next memory cell can be pre-charged while the data of the current memory cell is being read by means of a fewer number of control lines. In addition, the data of the next memory cell can be read while the voltage of the bit line is being reset after the data of the memory cell is read. As a result, the data can be randomly read at a high speed. 
     A semiconductor memory device according to the present invention comprises a memory cell array comprising a single or a plurality of basic cells, and selecting lines, bit lines and word lines provided respectively for designating the basic cells, wherein
         the basic cell includes:   first and second VGA memory cells capable of retaining data having at least a binary value, provided that N and M are respectively integers of at least one;   a first selecting transistor connected between a first terminal of the first VGA memory cell and the 2·M−1th bit line;   a second selecting transistor connected to between the first terminal of the first VGA memory cell and the 2·Mth bit line,   a third selecting transistor connected between a second terminal of the first VGA memory cell and the 2·M+1th bit line;   a fourth selecting transistor connected between the second terminal of the first. VGA memory cell and the 2·M+2th bit line;   a fifth selecting transistor connected between a first terminal of the second VGA memory cell and the 2·Mth bit line;   a sixth selecting transistor connected the first terminal of the second VGA memory cell and the 2·M+1th bit line,   a seventh selecting transistor connected a second terminal of the second VGA memory cell and the 2·M+2 bit line; and   an eighth selecting transistor connected to the second terminal of the second VGA memory cell and the 2·M+3 bit line; and, wherein   a gate of the first selecting transistor is connected to the 2·N−1th selecting line,   a gate of the second selecting transistor is connected to the 2·Nth selecting line,   a gate of the third selecting transistor is connected to the 2·N−1th selecting line,   a gate of the fourth selecting transistor is connected to the 2·Nth selecting line,   a gate of the fifth selecting transistor is connected to the 2·N+1th selecting line,   a gate of the sixth selecting transistor is connected to the 2·N+2th selecting line,   a gate of the seventh selecting transistor is connected to the 2·N+1th selecting line, and   a gate of the eighth selecting transistor is connected to the 2·N+2th selecting line.       

       FIGS. 22 and 23  in the preferred embodiments described later can be referenced with respect to the foregoing constitution. 
     According to the foregoing constitution, even in the case where the data of the memory cells connected to the same bit line is continuously read in the memory cells capable of controlling only the selected word line, the voltage of the bit line in the next memory cell can be pre-charged while the data of the current memory cell is being read. In addition, the data of the next memory cell can be read while the voltage of the bit line is being reset after the data of the memory cell is read. As a result, the data can be randomly read at a high speed. 
     According to the present invention, even in the case where the data in the memory cells connected to the same bit line is read, the data in the next memory cell can be read while the bit-line voltage is being reset after the reading operation. As a result, the data can be randomly read at a high speed. 
     The semiconductor memory device according to the present invention can randomly read data at a high speed in various semiconductor memory cells irrespective of types and structures thereof. The semiconductor memory device is, therefore, effective in any field in which the data is necessary to read randomly and speedily. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and other objects as well as advantages of the invention will become clear by the following description of preferred embodiments of the invention. A number of benefits not recited in this specification will come to the attention of the skilled in the art upon the implementation of the present invention. 
         FIG. 1  is a block diagram showing a constitution of a main part of a semiconductor memory device according to preferred embodiments of the present invention. 
         FIG. 2  shows a first constitutional example of an address determination circuit and peripheral circuits thereof used in the preferred embodiments. 
         FIG. 3  is a time chart of the address determination circuit shown in  FIG. 2 . 
         FIG. 4  shows a constitutional example of a charging/discharging bit line selecting circuit in a column decoder according to the preferred embodiments. 
         FIG. 5  is a time chart in a reading operation in the circuit shown in  FIG. 4 . 
         FIG. 6  shows a second constitutional example of the address determination circuit and the peripheral circuits thereof used in the preferred embodiments. 
         FIG. 7  shows a schematic circuit configuration of a memory cell array according to a preferred embodiment 1 of the present invention. 
         FIG. 8  shows a frame format of the circuit configuration according to the preferred embodiment 1. 
         FIG. 9  is a time chart in a reading operation in the circuit shown in  FIG. 8 . 
         FIG. 10  shows a schematic circuit configuration of a memory cell array according to a preferred embodiment 2 of the present invention. 
         FIG. 11  shows a frame format of the circuit configuration according to the preferred embodiment 2. 
         FIG. 12  is a time chart in a reading operation in the circuit shown in  FIG. 11 . 
         FIG. 13  shows a schematic circuit configuration of a memory cell array according to a preferred embodiment 3 of the present invention. 
         FIG. 14  shows a frame format of the circuit configuration according to the preferred embodiment 3. 
         FIG. 15  is a time chart in a reading operation in the circuit shown in  FIG. 14 . 
         FIG. 16  shows a schematic circuit configuration of a memory cell array according to a preferred embodiment 4 of the present invention. 
         FIG. 17  shows a frame format of the circuit configuration according to the preferred embodiment 4. 
         FIG. 18  is a time chart in a reading operation in the circuit shown in  FIG. 17 . 
         FIG. 19  shows a schematic circuit configuration of a memory cell array according to a preferred embodiment 5 of the present invention. 
         FIG. 20  shows a frame format of the circuit configuration according to the preferred embodiment 5. 
         FIG. 21  is a time chart in a reading operation in the circuit shown in  FIG. 20 . 
         FIG. 22  shows a schematic circuit configuration of a memory cell array according to a preferred embodiment 6 of the present invention. 
         FIG. 23  shows a frame format of the circuit configuration according to the preferred embodiment 6. 
         FIG. 24  is a time chart in a reading operation in the circuit shown in  FIG. 23 . 
         FIG. 25  is a first basic circuit configuration of a semiconductor memory device. 
         FIG. 26  is a time chart in a reading operation in the device shown in  FIG. 25 . 
         FIG. 27  is a second basic circuit configuration of the semiconductor memory device. 
         FIG. 28  is a time chart in a reading operation in the device shown in  FIG. 27 . 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     First, a basic constitution of a semiconductor memory device is described.  FIG. 25  shows a basic constitution diagram of a semiconductor memory device comprising NOR memory cells. A memory cell array  1   g  comprises at least one of an Nch memory-cell  11   n . Memory cells MC 00 -MC 03  are controlled with a word line WL 0  shared in a horizontal direction. Memory cells MC 10 -MC 13  are controlled with a wordline WL 1  shared in the horizontal direction. One ends of the memory cells  11   n  are respectively connected to bit lines BL 0 -BL 3 , while another ends thereof are connected to a common source line SL. The bit lines BL 0 -BL 3  are connected to one end of a sense amplifier  16  thereby shared via bit line selecting transistors  13   n . The bit line selecting transistors  13   n  are respectively controlled by bit line selecting transistor control lines (hereinafter, referred to as bit line selecting lines) YG 0 -YG 3 . Another end of the sense amplifier  16  is connected to a reference  17 . The sense amplifier  16  outputs a compared result between contents of the memory cells  11   n  and the reference  17  from a data output terminal Dout. 
     The bit lines BL 0 -BL 3  are connected respectively to a charging/discharging circuit  10  via charging bit line selecting transistors  14   a  and reset bit line selecting transistors  14   b . The charging bit line selecting transistors  14   a  are controlled respectively by charging bit line selecting transistor control lines (hereinafter, referred to as charging bit line selecting lines) CH 0 -CH 3 . The reset bit line selecting transistors  14   b  are controlled respectively by reset bit line selecting transistor control lines (hereinafter, referred to as reset bit line selecting lines) RS 0 -RS 3 . When voltages of the bit lines BL 0 -BL 3  are set to a predetermined voltage, the charging bit line selecting transistors  14   a  are selected. When the bit lines BL 0 -BL 3  are reset, the reset bit line selecting transistors  14   b  are selected. The charging/discharging circuit  10  has a function of pre-charging and resetting the voltages of the bit lines to a predetermined voltage. 
     A reading operation like this with respect to the memory cells is executed as follows. First, when an operation shifts to a reading mode, a voltage of the source line SL is set to a ground voltage. When an address is inputted and a selected memory cell is determined, the voltage of the bit line executing the reading operation is set to a predetermined voltage (for example, 3V) by the charging bit line selecting transistor  14   a  selected at the inputted address. 
     Next, a predetermined voltage (for example, 3V) is applied to the word line connected to the selected memory cell, and the bite line selecting transistor  13   n  in accordance with the inputted address is selected. At the time, the selected bit line is connected to the source line SL via the selected memory cell  11   n . Therefore, a cell current in accordance with data stored in the selected memory cell flows in the selected bit line, and the voltage of the selected bit line thereby changes. The cell current or the voltage of the selected bit line is compared to the reference  17  in the sense amplifier  16  so that the data is judged to be “0” or “1”. 
       FIG. 26  shows timings of voltage variations in the respective wirings in the case where the data is serially read from the memory cells MC 00 , MC 01  and MC 12  as an example of a random reading operation, in the semiconductor memory device shown in  FIG. 25 . 
     First, the operation is shifted to the reading mode by a mode signal, and the voltage of the source line SL is set to the ground potential (0V) before the address which selects the memory cell MC 00  is inputted. The reset bit line selecting lines RS 0 -RS 3  are selected, and the voltages of all of the bit lines BL 0 -BL 3  are set to the ground potential (period T 1 ). 
     When the address which selects the memory cell MC 00  is inputted, the reset bit line selecting line RS 0  becomes nonselective, and the charging bit line selecting line CH 0  is selected. As a result, the voltage of the bit line BL 0  is pre-charged to a predetermined voltage (for example, 1V) (period T 2 ). When the pre-charge of the voltage of the bit line BL 0  is completed, the charging bit line selecting line CH 0  becomes nonselective. When a clock signal falls, the word line WL 0  and the bit line selecting line YG 0  are selected so that the bit line BL 0  is connected to the source line SL via the memory cell MC 00 . As a result, the cell current in accordance with the data stored in the memory cell MC 00  flows in the bit line BL 0 , and the voltage of the bit line BL 0  thereby changes. Then, the cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is judged to be “0” or “1”. The read data that is a result of the judgment is outputted from the data output terminal Dout (period T 3 ). 
     When the clock signal rises, the word line WL 0  and the bit line selecting line YG 0  shift to the nonselective state, and the reset bit line selecting line RS 0  is selected. As a result, the voltage of the bit line BL 0  is reset to 0V (period T 4 ). 
     After the reset of the voltage of the bit line BL 0  is completed, the address which selects the memory cell MC 01  is inputted and the charging bit line selecting line CH 1  is selected. As a result, the voltage of the bit line BL 1  is pre-charged from 0V to a predetermined voltage. 
     And below in the same way, the word line WL 0  and the bit line selecting line YG 1  are selected at a falling edge of the clock signal, and the data of the selected memory cell MC 01  is read. After that, the word line WL 0  and the bit line selecting line YG 1  shift to the nonselective state at a rising edge of the clock signal, and the reset bit line selecting line RS 1  is selected. As a result, the voltage of the bit line BL 1  is reset to 0V. 
     In the same way when the data in the memory cell MC 12  is read, after the voltage of the bit line BL 2  is pre-charged to a predetermined voltage by selecting the charging bit line selecting line CH 2  when the select address of the memory cell MC 12  is inputted, the data in the memory cell MC 12  is read by selecting the word line BL 1  and the bit line selecting line YG 2  at the falling edge of the clock signal. After the data in the memory cell MC 12  is read, the word line WL 1  and the bit line selecting line YG 2  become nonselective, and the reset bit line selecting line RS 2  is selected concurrently at the rising edge of the clock signal. As a result, the voltage of the bit line BL 2  is reset. 
     As described above, when the data is read from the NOR memory cell, the pre-charging of the bit line voltage, the determination of data in the memory cell through the sense amplifier, and the resetting of the bit line voltage, are carried out. 
       FIG. 27  shows a basic structure diagram of a semiconductor memory device having virtual ground array (VGA) memory cells. A memory cell array  1   h  comprises a plurality of memory cells  11   n . Memory cells MC 00 -MC 02  are controlled through a single wordline WL 0  in a horizontal direction. Memory cells MC 10 -MC 12  are controlled through a single word line WL 1  in the horizontal direction. One ends of the memory cells  11   n  are respectively connected to bit lines BL 0 -BL 2 , while another ends thereof are respectively connected to adjacent bit lines BL 1 -BL 3 . The bit lines BL 0 -BL 3  are connected to one end of a common sense amplifier  16  respectively via bit line selecting transistors  13   n . The bit line selecting transistors  13   n  are controlled respectively by bit line selecting lines YG 0 -YG 3 . Another end of the sense amplifier  16  is connected to a reference  17 . The sense amplifier  16  outputs a result of comparison of contents of the memory cells  11   n  to the reference  17  from a data output terminal Dout. 
     The bit lines BL 0 -BL 3  are connected to a charging/discharging circuit  10  respectively via source line selecting transistors  14   c  and drain line selecting transistors  14   d . The source line selecting transistors  14   c  are respectively controlled by source line selecting transistor control lines (hereinafter, referred to as source line selecting lines) SS 0 -SS 3 . The drain line selecting transistors  14   d  are respectively controlled by drain line selecting transistor control lines (hereinafter, referred to as drain line selecting lines) DS 0 -DS 3 . The bit lines selected by the source line selecting lines SS 0 -SS 3  serve as the source lines of the memory cells  11   n . The bit lines selected by the drain line selecting lines DS 0 -DS 3  serve as the drain lines of the memory cells  11   n . The charging/discharging circuit  10  has a function of applying a source voltage and a drain voltage to the bit lines BL 0 -BL 3 . 
     A reading operation with respect to the VGA memory cell thus configured, for example, in the case of source sensing, is executed as follows. The drain line and the source line of the memory cell are determined in accordance with the inputted address. The voltage of the bit line serving as the drain line is pre-charged to a predetermined voltage through selecting the drain line selecting transistor  14   d  by the drain line selecting line (any of DS 0 -DS 3 ). The bit line serving as the source line is set to the ground voltage (0V) through selecting the source line selecting transistor  14   c  by the source line selecting line (any of SS 0 -SS 3 ), and serves as the bit line for the data reading operation with respect to the memory cell. 
     Next, the bit line selecting line  13   n  is selected in accordance with the inputted address so that the source line and the sense amplifier  16  are connected to each other. A predetermined voltage is applied to the selected word line so that the drain line is connected to the source line via the selected memory cell  11   n , and the cell current in accordance with the data stored in the selected memory cell flows in the source line, which changes the voltage of the source line. The cell current or the voltage of the source line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. 
       FIG. 28  shows timings of voltage variations in the respective wirings in the case where the data is serially read from the memory cells MC 00 , MC 01  and MC 11 , which is an example of the random reading operation in the semiconductor memory device shown in  FIG. 27 . First, the operation is shifted to the reading mode by the mode signal, and the voltages of all of the bit lines BL 0 -BL 3  are set to the ground potential (period T 1 ) through selection of the source line selecting lines SS 0 -SS 3  before the address which selects the memory cell MC 00  is inputted. 
     Next, when the address which selects the memory cell MC 00  is inputted, for example, in the case where the bit line BL 0  serves as the source line and the bit line BL 1  serves as the drain line, the source line selecting line SS 1  becomes nonselective and the drain line selecting line DS 1  is selected so that a predetermined drain voltage (for example, 1.1V) is pre-charged to the bit line BL 1  (period T 2 ). When the clock signal falls after the pre-charge of the voltage of the bit line BL 1  is completed, the source line selecting line SS 0  becomes nonselective, and the word line WL 0  and the bit line selecting line YG 0  are selected. As a result, the drain line is connected to the source line via the memory cell MC 00 . According to this, the cell current in accordance with the data stored in the memory cell MC 00  flows in the bit line BL 0 , which changes the voltage of the bit line BL 0 . The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”, and the read data showing the determination result is outputted from the data output terminal Dout (period T 3 ). 
     Next, when the clock signal rises, the word line WL 0 , the bit line selecting line YG 0  and the drain line selecting line DS 1  shift to the nonselective state, and the source line selecting lines SS 0  and SS 1  are selected. The voltages of the bit lines BL 0  and BL 1  are thereby reset to the ground voltage (period T 4 ). In the case where the address which selects the memory cell MC 01  is inputted after the reset of the voltages of the bit lines BL 0  and BL 1  is completed, and the bit line BL 1  serves as the source line and the bit line BL 2  serves as the drain line, the source line selecting line SS 2  becomes nonselective and the drain line selecting line DS 2  is selected. As a result, the bit line BL 2  is pre-charged from the ground potential to a predetermined voltage. 
     Hereinafter in the same way, the source line selecting line SS 1  becomes nonselective, and the word line WL 0  and the bit line selecting line YG 1  are selected at the falling edge of the clock signal, and the data in the selected memory cell MC 01  is read. When the clock signal rises, the word line WL 0 , bit line selecting line YG 1  and drain line selecting line DS 2  shift to the non-selective state, and the source line selecting lines SS 1  and SS 2  are selected. As a result, the voltages of the bit lines BL 1  and BL 2  are reset to the ground potential. 
     In the same way when the data in the next memory cell MC 11  is read, in the case where the bit line BL 1  serves as the source line and the bit line BL 2  serves as the drain line, the source line selecting line SS 2  becomes nonselective and the drain line selecting line DS 2  is selected when the select address of the memory cell MC 11  is inputted so that the voltage of the bit line BL 2  is pre-charged to a predetermined voltage. Thereafter, the source line selecting line SS 1  becomes nonselective, and the wordline WL 1  and the bit line selecting line YG 1  are selected at the falling edge of the clock signal so that the data in the selected memory cell MC 11  is read. Further, the word line WL 1 , bit line selecting line YG 1  and drain line selecting line DS 2  shift to the nonselective state and the source line selecting lines SS 1  and SS 2  are selected at the rising edge of the clock signal, and the voltages of the bit lines BL 1  and BL 2  are thereby reset to the ground potential. 
     As described above, when the data is read from the VGA memory cell, the voltage pre-charging of the bit line, the determination of the data in the memory cell in the sense amplifier, and the voltage reset of the bit line, are carried out. 
     Irrespective of the NOR or VGA type of the mentioned-above memory cell, in the case where the data is read from the memory cell by stockpiling the data in the memory cell and comparing the current or the voltage changed depending on the stored data to the reference, the voltage pre-charging of the bit line, the determination of the data in the memory cell in the sense amplifier, and the voltage reset of the bit line, are carried out. 
     Hereinafter, preferred embodiments of a semiconductor memory device according to the present invention are described in detail referring to the drawings. First, a description of a basic constitution according to the present invention based on the constitution of the aforementioned semiconductor memory device is given below. 
     Explanation on Basic Constitution According to the Present Invention 
       FIG. 1  is a block diagram illustrating a constitution of a main part of a semiconductor memory device according to the preferred embodiments of the present invention. The semiconductor memory device comprises a memory cell array  1 , a row decoder  2 , word lines WL and selecting transistor control lines GL, GR and SG drawn from the row decoder  2 , a column decoder  3 , bit lines BL drawn from the column decoder  3 , a charging /discharging bit line selecting transistor  4 , a data input /output circuit  5 , a control circuit  6 , a data determination circuit  7 , an address determination circuit  8 , an address determination signal line  8   a  drawn from the address determination circuit  8 , an address latch circuit  9 , and a charging/discharging circuit  10 . In the drawing, a power-supply circuit, an address buffer and the like are omitted. The column decoder  3  includes a bit line selecting transistor control line (hereinafter, referred to as bit line selecting line) YG. 
     An address signal AD is inputted to the address latch circuit  9  and the address determination circuit  8 . The address latch circuit  9  retains the address signal AD inputted at a timing of an address latch signal from the control circuit  6  and transmits the retained address signal AD to the row decoder  2 , column decoder  3  and address determination circuit  8 . When the address signal is invalid, the address signal AD is not retained in the address latch circuit  9  and transmitted to the row decoder  2 , column decoder  3  and address determination circuit  8 . In the case where, for example, an address signal AD 2  is inputted after an inputted address signal AD 1  is latched in the address latch circuit  9 , the address determination circuit  8  is the one for outputting an address determination signal AJ when the address signal AD 1  retained in the address latch circuit  9  and the address signal AD 2  inputted after the address signal AD 1  is latched is compared to each other and the two address signals are coincident with each other. For example, when the addresses of the address signals AD 1  and AD 2  that select the bit line are coincident with each other, the address determination signal AJ outputs a determination showing the coincidence. The output of the address determination signal AJ counter changes every time the addresses are coincident with each other. For example, if the address signals are coincident in a state where the first address determination signal Aj is in the “L” state, the address determination signal AJ shifts to the “H” state at the time. 
     The address determination signal AJ maintains the “H” state until the address signals are coincident with each other next time, and shifts to the “L” state when the address signals are coincident with each other again. The address determination signal AJ is inputted to the row decoder  2  and the column decoder  3 . It is desirable that the addresses are compared in the address determination circuit  8  when the address latch control signal becomes valid and the next address is inputted. 
     The row decoder  2  receives the address signal AD via the address latch circuit  9  and the address determination signal AJ outputted from the address determination circuit  8 , and selects switching control of the selecting transistor control lines GL and GR (or SG), and any or all of a plurality of word lines WL arranged in the memory cell array  1 . The selected word lines WL and the selected transistor control lines GL and GR (or SG), whose voltages are changed to such voltages that are suitable for the reading, writing and erasing operations, are activated. 
     The column decoder  3  receives the address signal AD via the address latch circuit  9  and the address determination signal AJ outputted from the address determination circuit  8 , and controls the bit line selecting lines YG present in the column decoder  3  and the charging/discharging bit line selecting transistor  4 , and selects any of the plurality of bit lines BL arranged in the memory cell array  1  or one of them at every predetermined number. 
     When the data is read, the bit line BL selected by the column decoder  3  is connected to the sense amplifier in the data determination circuit  7 , and the data in the memory cell is read. The memory cell data read by the data determination circuit  7  is outputted from the data output terminal Dout of the data input/output circuit  5 . When the data is written, the data to be written is inputted to the data input/output circuit  5 . The charging/discharging circuit  10  pre-charges the bitline BL selected by the column decoder  3  to a predetermined voltage or resets it. 
       FIG. 2  shows a frame format of a constitutional example of the address determination circuit  8 , address latch circuit  9 , address decoding circuit  2   a  included in the row decoder  2  and address decoding circuit  3   a  included in the column decoder  3 . The address determination circuit  8  comprises EX-OR circuits e 1 , an NOR circuit n 1 , an AND circuit a 1 , a T-flopflop t 1  and a D-flipflop d 1 . The address latch circuit  9  comprises D-flipflops d 1 , wherein one of the D-flipflops d 1  is connected to one address. A 0 -A 3  composes the address signal AD. In the present example, A 0 -A 1  are allocated to the addresses that select the bit lines, and A 2 -A 3  are allocated to the addresses that select the word lines. AL denotes an address latch control signal that activates the address latch of the address latch circuit  9 . CAJ denotes an address determination signal control signal for controlling the output of the result on address comparison obtained in the address determination circuit  8  in the AND circuit a 1 . RAJ denotes an address determination signal reset signal for initializing the address determination signal AJ of the address determination circuit  8  in the T-flipflop t 1 . In the address decoding circuit  2   a  included in the row decoder  2 , any of the selecting transistor control lines GL 0 -GL 3  and GR 0 -GR 3  is selected by the address determination signal AJ and the addresses A 2  and A 3  through the address latch circuit  9 . 
     In the address decoding circuit  3   a  included in the column decoder  3 , any of the bit line selecting lines YG 0 -YG 3  is selected by the address determination signal AJ and the addresses A 0  and A 1  through the address latch circuit  9 . Further, any of next bit line selecting transistor control lines (hereinafter, referred to as next bit line selecting lines) NYG 0 -NYG 3  is selected by a non-latched output o 3  of the address determination signal and non-latched addresses A 0  and A 1 . The next bit line selecting lines NYG are in charge of controlling selection or non-selection of any or all of the charging bit line selecting lines CH, reset bit line selecting lines RS, drain line selecting lines DS and source line selecting lines SS. 
       FIG. 3  shows timings of variations of the respective wiring signals when 0h, 8h, 1h and 9h are inputted as the address signal in the address determination circuit  8  shown in  FIG. 2 . First, the address determination signal control signal CAJ is in the “L” state, and the address latch control signal AL and the address determination signal reset signal RAJ are in the “H” state. When the address determination signal reset signal RAJ in the “H” state, the address determination signal AJ is in the “L” state. When the address determination signal RAJ is reset and released after the address determination signal reset signal RAJ shifts to the “L” state. And then, when 0h is inputted to the address signal AD, the address is not latched to the address latch circuit  9  because the address latch control signal AL is in the “H” state, and an output o 1  is thereby in the “H” state. 
     Meanwhile, because the address determination signal control signal CAJ is in the “L” state, an output o 2  maintains the “L” state, and the output o 3  is in the “L” state, and the address determination signal AJ is in the “L” state. At the time, the selecting transistor control line GL 0  is selected in the address decoding circuit  2   a  and the bit line selecting line YG 0  and the next bit line selecting line NYG 0  are selected in the address decoding circuit  3   a  because the address determination signal AJ is in the “L” state. 
     Next, when the address latch control signal AL shifts to the “L” state, the address (0h) is latched in the address latch circuit  9 . When 8h is inputted to the address signal AD during a period when the address latch control signal AL is in the “L” state, the address (8h) and the address (0h) latched in the address latch circuit  9  are compared to each other in the address determination circuit  8 . In relation to both of the address (0h=0000) and the address (8h=1000), the signal (00) of the bit line selecting addresses A 0 -A 1  is not changed and remains the same. Therefore, the output o 1  maintains the “H” state. 
     When the address determination signal control signal CAJ shifts to the “H” state and the output o 2  shifts to the “H” state, the T-flipflop t 1  detects a rising edge of the output o 2 , and the output o 3  shifts to the “H” state (inverted state). At the time, the next bit line selecting line NYG 1  is selected by the non-latched inputted address (8h) and the output o 3 . The next bit line selecting line NYG 1  is selected until the next address is inputted. When the address determination signal control signal CAJ shifts to the “L” state, the output o 2  shifts to the “L” state. The output o 3  maintains the “H” state until the rising edge of the output o 2  is detected again. When the address latch control signal AL shifts to the “H” state, the address latch becomes invalid, and the selecting transistor control line GR 2  and the bit line selecting line YG 1  are selected in accordance with the inputted address (8h) and the address determination signal AJ (“H” state). In a similar manner, when the address (1h=1000) is inputted after the address latch control signal AL shifts to the “L” state and the address (8h=1000) is latched, the output o 1  is in the “L” state because the bit line selecting addresses A 0 -A 1  (00 and 01) are not coincident with each other. When the address determination signal control signal CAJ is in the “H” state, the output o 2  maintains the “L” state, and the output o 3  is not inverted. At the time, the next bit line selecting line NYG 2  is selected by the non-latched inputted address (1h) and the output  03 , and the next bit line selecting line NYG 2  is selected until the next address is inputted. Because the address determination signal AJ maintains the “H” state, the selecting transistor control line GR 0  and the bit line selecting line YG 2  are selected in accordance with the inputted address (1h) and the address signal AJ (“H” state) when the address latch control signal AL shifts to the “H” state. 
     Next, when the address (9h=1001) is inputted after the address latch control signal AL shifts to the “L” state and the address (1h=0001) is latched, the bit line selecting addresses A 0 -A 1  (01) are coincident with each other, and then, the output o 1  shifts to the “H” state. The address determination signal control signal CAJ is in the “H” state, the output o 2  is in the “H” state, and the output o 3  is inverted (“L” state). At the time, the next bit line selecting line NYG 1  is selected by the non-latched inputted address (9h) and the output o 3 , and the next bit line selecting line NYG 1  is selected until the next address is inputted. Because the address determination signal AJ is in the “L” state, the selecting transistor control line GL 2  and the bit line selecting line YG 1  are selected in accordance with the inputted address (9h) and the address determination signal AJ (“L” state) when the address latch control signal AL is in the “H” state. 
     Summarizing the foregoing description, the address determination signal AJ is inverted every time when the latched address signal is coincident with the address signal that is subsequently inputted, which is shown in  FIG. 3 . 
       FIG. 4  shows a schematic constitutional example of a circuit included in the column decoder  3 , wherein the charging bit line selecting lines CH 0 -CH 3  and the reset bit line selecting lines RS 0 -RS 3  are selected based on the bit line selecting lines YG 0 -YG 3 , next bit line selecting lines NYG 0 -NYG 3 , address determination signal control signal CAJ and clock signal, or the drain line selecting lines DS 0 -DS 3  and the source line selecting lines SS 0 -SS 3  are selected based on the aforementioned group of signals. 
       FIG. 5  shows timings of variations of the respective wiring signals when YG 0 , YG 2 , YG 2  and YG 2  are sequentially inputted to the inputted address in the circuit shown in  FIG. 4 . In the drawing, the address latch control signal SL is regarded as the clock signal. Though the charging bit line selecting lines CH and the reset bit line selecting lines RS are described below, it is possible that the charging bit line selecting lines are replaced with the drain line selecting lines DS, and the reset bit line selecting lines RS are replaced with the source line selecting lines SS. 
     When the operation shifts to the reading mode by the mode signal at first, the reset bit line selecting lines RS 0 -RS 3  are all selected. 
     Next, when the address that selects the bit line selecting line YG 0  is inputted, the next bit line selecting line NYG 0  is selected. However, the selection/non-selection of the charging bit line selecting line CH 0  and the reset bit line selecting line RS 0  is not thereby affected because the address determination signal control signal CAJ is in the “L” state. Further, the address is not latched because the clock signal is in the “H” state, and the bit line selecting line YG 0  is selected. Based on that, the charging bit line selecting line CH 0  is selected, while the reset bit line selecting line RS 0  becomes nonselective. When the clock signal falls, the charging bit line selecting line CH 0  becomes nonselective, and the address that selects the bit line selecting line YG 0  is latched. As a result, the bit line selecting line YG 0  is continuously selected until the clock signal rises. As the bit line selecting line YG 0  is in a selective state at the time, the reset bit line selecting line RS 0  retains its nonselective state. When the address that selects the bit line selecting line YG 2  is inputted during a period when the clock signal is in the “L” state, the next bit line selecting line NYG 2  is selected. When the address determination signal control signal CAJ shifts to the “H” state, the charging bit line selecting line CH 2  is selected, while the reset bit line selecting line RS 2  becomes nonselective because the next bit line selecting line NYG 2  is selected. The reset bit line selecting lines RS 0  and RS 2  are both in the nonselective state because the bit line selecting line YG 0  is continuously selected with the address latch. 
     Next, as the address latch is released when the clock signal rises, the reset bit line selecting line RS 0  is selected, and the bit line selecting line YG 2  is selected. After that, when the address determination signal control signal CAJ shifts to the “L” state, though the next bit line selecting line NYG 2  is irrelevant to the selection/non-selection of the charging bit line selecting line CH 2  and the reset bit line selecting line RS 2 , the bit line selecting line YG 2  is selected at the time. Therefore, the selection of the charging bit line selecting line CH 2  and the non-selection of the reset bit line selecting line RS 2  are maintained. When the clock signal (address latch control signal AL) falls, the charging bit line selecting line CH 2  becomes nonselective. When the address that selects the bit line selecting line YG 2  is inputted during a period of the “L” state where the clock signal falls, the determination on the consistency of the addresses is outputted from the address determination circuit  8 . Accordingly, the next bit line selecting line NYG 3  is selected, the charging bit line selecting line CH 3  is selected, and the reset bit line selecting line RS 3  is in a non-selective state. After that, when the clock signal rises, the reset bit line selecting line RS 2  is selected. However, the selection of the charging bit line selecting line CH 3  and the non-selection of the reset bit line selecting line RS 3  are maintained. After that, when the clock signal falls, the charging bit line selecting line CH 3  becomes nonselective. When the address that selects the bit line selecting line YG 2  is inputted during the period of “L” state where the clock signal falls, the determination on the consistency of the addresses is outputted from the address determination circuit  8 . Therefore, the next bit line selecting line NYG 2  is selected, the charging bit line selecting line CH 2  is in a selective state, and the reset bit line selecting line RS 2  is in non-selective state. Though the reset bit line selecting line RS 3  is selected when the clock signal rises, the selective state of the charging bit line selecting line CH 2  and the non-selective state of the reset bit line selecting line RS 2  are maintained. When the clock signal falls, the charging bit line selecting line CH 2  becomes non selective. The reset bit line selecting line RS 2  is selected when the clock signal rises. 
     When the circuit shown in  FIG. 4  is used, the bit line, which is different to the bit line for reading the data from the memory cell, can be charged/discharged while the data is being read from the memory cell. 
     The address determination circuit  8  shown in  FIG. 2  is configured in such a manner that the address determination signal AJ is inverted only when the bit line selecting addresses A 0 -A 1  are all consistent. However, the function expected in the present invention can be exerted even in an address determination circuit  8 ′ wherein the address determination signal AJ is inverted only when lowest-order addresses of the bit line selecting addresses A 0 -A 1  are consistent as shown in the circuit configuration of  FIG. 6 . 
     Preferred Embodiment 1 
       FIG. 7  shows a schematic plan structure of a memory cell array according to a preferred embodiment 1 of the present invention. As shown in  FIG. 7 , a semiconductor memory device according to the present preferred embodiment comprises a memory cell array  1   a  comprising memory cells  11  with source terminals s 1 . Two selecting transistors TL [n, m] and TR [n, m] (n≧0, m≧0) are connected to a first terminal of a memory cell MR [n, m]. The selecting transistors TL [n, m] are connected to first bit lines BL [m], and the selecting transistors TR [n, m] are connected to second bit lines BL [m+1]. An end of a sense amplifier  16  is connected to the respective bit lines BL [m] via bit line selecting transistors  13  controlled by bit line selecting lines YG [m]. The respective bit lines BL [m] are connected to a charging/discharging circuit  10  via charging bit line selecting transistors  14  controlled by charging bit line selecting transistor control lines (hereinafter, referred to as charging bit line selecting lines) CH [m]. The selecting transistors TL [n, m] and TR [n, m] are controlled through selecting transistor control lines GL [n] and GR [n]. A reference  17  is connected to another end of the sense amplifier  16 . The charging/discharging circuit  10  pre-charges voltages of the bit lines BL 0 -BL 3 . 
     Though there is no particular limitation to the present preferred embodiment, at least one of Pch non-volatile memory or depression non-volatile memory can be applied to the memory cell array  1   a  shown in  FIG. 7 . More specifically, a memory cell in which it is unnecessary to pre-charge the voltage of the bit line to a predetermined voltage before the reading operation can be adopted as the memory cell  11 . Further, as there is no particular limitation to a structure of the memory cell  11 , any of NOR, NAND and AND memory cells is applicable. It is good enough that the memory cell array  1   a  has a structure that the memory cells are connected to the source lines and bit lines. 
     In  FIG. 8 , the constitution shown in  FIG. 7  is developed in such a manner that Pch non-volatile memory cells  11   p  are adopted as the memory cells  11  wherein a Pch transistor constitutes a selecting transistor  12   p , a bit line selecting transistor  13   p  and a charging bit line selecting transistor  14   p . The memory cell array  1   a  consists of at least one Pch memory cell  11   p . Memory cells MC 00 -MC 02  are controlled through a single word line WL 0  in a lateral direction. Memory cells MC 10 -MC 12  are controlled through a single word line WL 1  in a lateral direction. Memory cells MC 20 -MC 22  are controlled through a single word line WL 3  in a lateral direction. One ends of the memory cells  11   p  are respectively connected to the bit lines BL 0 -BL 3  via the two selecting transistors TL and TR. Another ends of the memory cells  11   p  are connected to a single source line SL. The bit lines Bl 0 -BL 3  are connected respectively to one end of the common sense amplifier  16  via the bit line selecting transistors  13   p . The bit line selecting transistors  13   p  are respectively controlled through the bit line selecting lines YG 0 -YG 3 . The sense amplifier  16  comprises a circuit for discharging the voltage of the bit line. Another end of the sense amplifier  16  is connected to the reference  17 . A result of comparison of the contents of the memory cells  11   p  to the reference  17  in the sense amplifier  16  is outputted from a data output terminal Dout which is an output terminal of the sense amplifier  16 . 
     In addition, the reference  17  may be any of a current source such as a memory cell and a transistor capable of outputting an intermediate current between a cell current of the memory cell  11   p  which retains “1” data and a cell current of the memory cell  11   p  which retains “0” data. Furthermore, the reference  17  may be a voltage source having an intermediate voltage between the bit-line voltage in the reading operation with respect to the memory cell  11   p  retaining the “1” data and the bit-line voltage in the reading operation with respect to the memory cell  11   p  retaining the “0” data. Further, the reference  17  may be configured in such a manner that two selecting transistors are connected to one end of the reference cell or memory cell and the two selecting transistors are alternately switched every time when the data is read from the memory cell so that they can be connected to the different bit lines in the same manner as the configuration of the memory cells described earlier. Like this, there is no special limitation to a structure of the reference  17  as far as it serves as a comparison reference when the data of the memory cell  11   p  is discriminated by the sense amplifier  16 . 
     The bit lines BL 0 -BL 3  are connected respectively to the charging/discharging circuit  10  via the charging bit line selecting transistors  14   p . The charging bit line selecting transistors  14   p  are controlled respectively through the charging bit line selecting lines CH 0 -CH 3 . When the voltages of the bit lines BL 0 -BL 3  are set to a predetermined voltage, the charging bit line selecting transistors  14   p  are selected. The charging/discharging circuit  10  has a function of pre-charging the bit-line voltage to the predetermined voltage. 
     A reading operation with respect to the Pch memory cell  11   p  is carried out as follows. In a reading mode, the voltage of the source line SL and the voltages of all of the bit lines are set to a power-supply voltage, and a predetermined voltage (for example, 1V) is applied to all of the word lines. When the clock signal falls, the charging bit line selecting transistor  14   p  in accordance with the inputted address becomes nonselective, and the selecting transistor  12   p  and the bit line selecting transistor  13   p  are selected. Accordingly, the voltage of the selected bit line drops from the power-supply voltage through a discharging circuit provided in the sense amplifier  16 . At the time, the cell current in accordance with the data stored in the selected memory cell  11   p  flows in the selected bit line, and the voltage of the selected bit line thereby changes. The cell current or the voltage of the selected bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. 
       FIG. 9  shows timings of voltage variations in the respective wirings when the data in the memory cells MC 00 , MC 01 , MC 11  and MC 22  is sequentially read as an example of the random reading operation in the circuit configuration shown in  FIG. 8 . A description is given below provided that the address latch control signal AL is regarded as the clock signal and the address determination signal reset signal RAJ is regarded as the mode signal by using the address determination circuit  8  shown in  FIG. 2 . The description is further given based on the assumption that the address determination signal control signal CAJ shifts to the “H” state and the address determination signal AJ becomes valid by releasing the address latch after the address signals are compared as shown in the signal timings of  FIG. 3 . In  FIG. 9 , the variation timing of the address determination signal control signal CAJ is omitted. 
     When the operation shifts to the reading mode based on the mode signal (address determination signal reset signal RAJ), the output of the address determination circuit  8  is reset so as to be the “L” state. Further, the voltage of the source line SL is set to the power-supply voltage and the charging bit line selecting lines CH 0 -CH 3  are all selected not later than the address that selects the memory cell MC 00  is inputted. As a result, the voltages of all of the bit lines BL 0 -BL 3  are charged to the power-supply voltage. 
     Meanwhile, a predetermined voltage is applied to the word lines WL 0 -WL 2  (period T 1 ). The address that selects the memory cell MC 00  inputted during the period T 1  is transmitted to the row decoder  2  and the column decoder  3  via the address latch circuit  9 , and the word and bit lines are decoded in accordance with the inputted address. During the period, the address is not latched in the address latch circuit  9  because the clock signal is in the “H” state. 
     Next, when the clock signal falls, the address latch becomes valid, and the address that selects the memory cell MC 00  is latched in the address latch circuit  9 . Further, the charging bit line selecting line CH 0  becomes nonselective, and the bit line selecting line YG 0  is selected. Then, the voltage of the bit line BL 0  further drops from the power-supply voltage by the function of the discharging circuit in the sense amplifier  16 . 
     Next, the selecting transistor control line GL 0  is selected and the selecting transistors TL 0 -TL 2  are turned on, and the bit line BL 0  and the source line SL are thereby connected to each other via the memory cell MC 00 . At the time, the cell current in accordance with the data stored in the memory cell MC 00  flows in the bit line BL 0 , which changes the voltage of the bit line BL 0 . The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. Then, the read data showing the determination result is outputted from the data output terminal Dout (period T 2 ). 
     As the bit line selecting lines YG 1 -YG 3  are in the nonselective state during the period T 2 , the bit lines BL 1 -BL 3  are not discharged through the discharging circuit in the sense amplifier  16 . Further, at the time, the selecting transistor control line GL 0  is selected so that the selecting transistors TL 01  and TL 02  are also turned on. However, the voltages of the bit lines BL 1  and BL 2  are maintained to be the power-supply voltage because the voltage of the source line SL is the power-supply voltage. Further, the charging bit line selecting lines CH 1 -CH 3  are selected at the time. In other words, the voltages of the bit lines BL 1 -BL 3  are maintained to be the power-supply voltage during the period T 2 . 
     Further, the address that selects the memory cell MC 01  is inputted while the data in the memory cell MC 00  is being read during the period T 2 . During the period T 2 , the address retained in the address latch circuit  9  (address that selects the memory cell MC 00 ) is valid because the clock signal is in the “L” state. Therefore, the selection of the word lines and bit lines is not immediately switched by the address that selects the memory cell MC 01  inputted from the address signal AD. The address that selects the memory cell MC 01  is transmitted to the address determination circuit  8  and compared to the select address of the memory cell MC 00  retained in the address latch circuit  9 . The comparison is carried out based on the determination whether or not the bit line used in the current reading operation and the bit line used in the next reading operation are the same. The bit line BL 1  is used for reading the data in the memory cell MC 01  in the case where the selecting transistor TL 01  is selected. Because the used bit line BL 1  is different from the bit line BL 0  used in the reading operation with respect to the memory cell MC 00 , the determination result by the address determination circuit  8  shows the inconsistency. When the address determination signal AJ shows the inconsistency, the selecting transistor control line and the bit line selecting line are not counterchanged, and the selecting transistor control line GL 0  and the bit line selecting line YG 1  are used in the reading operation with respect to the memory cell MC 01 . 
     Next, when the reading operation with respect to the memory cell MC 00  is completed and the clock signal rises, the address latch is released and the word lines and bit lines are decoded in the row decoder  2  and the column decoder  3  in accordance with the address that selects the memory cell MC 01  and the address determination signal AJ. Further, the selecting transistor control line GL 0  becomes nonselective so that the selecting transistors TL 00 -TL 02  are turned off and the charging bit line selecting line CH 0  is selected. As a result, the voltage of the bit line BL 0  is reset to the power-supply voltage (period T 3 ). 
     During the period T 3 , after the address decoding in the row decoder  2  and the column decoder  3  is completed, the data in the memory cell MC 01  is read before the reset of the voltage of the bit line BL 0  is completed. When the data in the memory cell MC 01  is read, first, the clock signal falls, and then, the address that selects the memory cell MC 01  is latched in the address latch circuit  9  and the charging bit line selecting line CH 1  becomes nonselective. Accordingly, the selecting transistors GL 00 -TL 02  are turned on by selecting the selecting transistor control line GL 0 . 
     Further, during the period T 3 , the bit line selecting line YG 1  is selected, and the voltage of the bit line BL 1  further drops from the power-supply voltage by the discharging circuit in the sense amplifier  16 . At the time, the cell current in accordance with the data stored in the memory cell MC 01  flows in the bit line BL 1 , and the voltage of the bit line BL 1  thereby changes. The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. The read data showing the determination result is outputted from the data output terminal Dout. 
     Meanwhile, while the data in the memory cell MC 01  is being read, the reset of the voltage of the bit line BL 0  is completed, and the voltage of the bit line BL 0  is set to the power-supply voltage. Further, while the data in the memory cell MC 01  is being read, the address that selects the memory cell MC 11  is inputted. In a manner similar to the reading operation with respect to the memory cell MC 00 , the address that selects the memory cell MC 11  is compared to the select address of the memory cell MC 01  retained in the address latch circuit  9 . The bit line BL 1  is used for reading the data in the memory cell MC 11  in the state where the selecting transistor TL 11  is selected, and the bit line is the same as the bit line BL 1  used in the reading operation with respect to the memory cell MC 01 . Therefore, the determination result by the address determination circuit  8  shows the consistency. At the time, the selecting transistor control line and the bit line selecting line are counterchanged, and consequently, the selecting transistor control line GR 1  and the bit line selecting line YG 2  are used when the data in the memory cell MC 11  is read. 
     When the reading operation with respect to the memory cell MC 01  is completed and the clock signal rises, the address latch is released, and the word lines and bit lines are decoded in the row decoder  2  and the column decoder  3  in accordance with the select address of the memory cell MC 11  and the address determination signal AJ. Further, the selecting transistor control line GL 0  becomes nonselective, the selecting transistors TL 00 -TS 02  are turned off, and the charging bit line selecting line CH 1  is selected. As a result, the voltage of the bit line BL 1  is reset to the power-supply voltage. 
     Next, while the voltage of the bit line BL 1  is being reset, the data in the memory cell MC 11  is read. In the reading operation with respect to the memory cell MC 11 , first, the clock signal falls, and the select address of the memory cell MC 11  is latched in the address latch circuit  9 . Then, the charging bit line selecting line CH 2  becomes nonselective and the selecting transistor control line GR 1  is selected so that the selecting transistors TR 10 -TR 12  are turned on. Further, the bit line selecting line YG 2  is selected, and the voltage of the bit line BL 2  further drops from the power-supply voltage by the function of the discharging circuit in the sense amplifier  16 . At the time, the cell current in accordance with the data stored in the memory cell MC 11  flows in the bit line BL 2 , and the voltage of the bit line BL 2  thereby changes. The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. Then, the read data showing the determination result is outputted from the data output terminal Dout. Because the bit line BL 2  is used in the reading operation with respect to the memory cell MC 11 , the data in the memory cell MC 11  can be read even during resetting the voltage of the bit line BL 1 . 
     Next, while the data is being read from the memory cell MC 11 , the address that selects the memory cell MC 22  is inputted. In a manner similar to the foregoing description, the select address of the memory cell MC 22  is compared to the select address of the memory cell MC 11  retained in the address latch circuit  9 . In the state where the selecting transistor TR 22  is selected, the bit line BL 3  is used in the reading operation with respect to the memory cell MC 22 . The bit line BL 3  is different from the bit line BL 2  used in the reading operation with respect to the memory cell MC 11 , and the determination result by the address determination circuit  8  shows the inconsistency. Therefore, the selecting transistor control line and the bit line selecting line are not switched, and the selecting transistor control line GR 2  and the bit line selecting line YG 3  are used in the reading operation of the memory cell MC 22 . 
     When the reading operation with respect to the memory cell MC 11  is completed and the clock signal rises, the address latch is released, and the word lines and bit lines are decoded in the row decoder  2  and the column decoder  3  in accordance with the address that selects the memory cell MC 11  and the address determination signal AJ. Further, the selecting transistor control line GR 1  becomes nonselective so that the selecting transistors TL 10 -TL 12  are turned off, the charging bit line selecting line CH 2  is selected and the voltage of the bit line BL 2  is reset to the power-supply voltage. As a result, while the voltage of the bit line BL 2  is resetting, the data in the memory cell MC 22  is read via the bit line BL 3  while the voltage of the bit line BL 2  is being reset. 
     And then, when the clock signal falls, the select address of the memory cell MC 22  is latched in the address latch circuit  9 , the charging bit line selecting line CH 3  becomes nonselective, and the selecting transistor control line GR 2  is selected. As a result, the selecting transistors TR 20 -TR 22  are turned on. Further, the bit line selecting line YG 3  is selected, and the voltage of the bit line BL 3  further drops from the power-supply voltage by the function of the discharging circuit in the sense amplifier  16 . At the time, the cell current in accordance with the data stored in the memory cell MC 22  flows in the bit line BL 3 , and the voltage of the bit line BL 3  thereby changes. The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. Then, the read data showing the determination result is outputted from the data output terminal Dout. 
     As described above, the selecting transistor control lines GL and GR and the bit line selecting line YG are switched over by the determination signal of the address determination circuit  8  so that the bit line used in the reading operations is switched. Thereby, the data in the next cell can be read while the voltage of the bit line is being reset after the reading operation. As a result, the data can be randomly read at a high speed. 
     In the aforementioned description of the preferred embodiment 1, though the Pch transistor constitutes the selecting transistor  12 , bit line selecting transistor  13  and charging bit line selecting transistor  14  shown in  FIG. 7 , and one Pch non-volatile memory cell constitutes the memory cell array  1   a , at least two of Pch non-volatile memory cells may constitute the memory cell array  1   a . The structure of the memory cell is not particularly limited, and an NOR structure may be adopted. Furthermore, the present preferred embodiment is not limited to the Pch non-volatile memory cell and at least one of depression non-volatile memory can be applied. More specifically, the present preferred embodiment can be applied to a semiconductor memory device comprising memory cells in which it is unnecessary to pre-charge the voltage of the bit line to a predetermined voltage before the reading operation. Such a semiconductor memory device can also randomly read data at a high speed in a similar operation. 
     Preferred Embodiment 2 
     An object of a preferred embodiment 2 of the present invention is to reduce the number of the control lines by sharing the selecting transistor control lines.  FIG. 10  shows a schematic plan structure of a memory cell array according to the preferred embodiment 2. As shown in  FIG. 10 , a semiconductor memory device according to the present preferred embodiment comprises a memory cell array  1   b  comprising memory cells with source terminals s 1 . Two selecting transistors TL [n, m] and TR [n, m] (n≧0, m≧0) are connected to a first terminal of a memory cell MR [n, m]. The selecting transistors TL [n, m] are connected to first bit lines BL [m], and the selecting transistors TR [n, m] are connected to second bit lines BL [m+1]. The respective bit lines BL [m] are connected to an end of a sense amplifier  16  via bit line selecting transistors  13  controlled by bit line selecting lines YG [m]. The respective bit lines BL [m] are connected to a charging/discharging circuit  10  via charging bit line selecting transistors  14  controlled by charging bit line selecting lines CH [m]. The selecting transistors TL [n, m] and TR [n, m] are controlled through selecting transistor control lines SG [n] and SG [n+1]. A reference  17  is connected to another end of the sense amplifier  16 . The charging/discharging circuit  10  pre-charges and resets voltages of the bit lines BL 0 -BL 3 . 
     There is no particular limitation to the present preferred embodiment, however, at least one of Pch non-volatile memory or depression non-volatile memory capable of controlling only the selected word line can be applied to the memory cell  11  shown in  FIG. 10 . More specifically, a memory cell in which it is unnecessary to pre-charge the voltage of the bit line to a predetermined voltage before the reading operation can be adopted as the memory cell  11 . Further, there is no particular limitation to a type of the memory cell  11 , to which any of NOR, NAND and AND memory cells is applicable. The memory cell array  1   b  may have a structure wherein the memory cells are connected to the source and bit lines. 
     In  FIG. 11 , the constitution shown in  FIG. 10  is developed in such a manner that Pch non-volatile memory cells  11   p  are applied to the memory cells  11 . In the drawing, a Pch transistor constitutes a selecting transistor  12   p , a bit line selecting transistor  13   p  and a charging bit line selecting transistor  14   p . The memory cell array  1   b  comprises at least one of Pch memory cell  11   p . Memory cells MC 00 -MC 02  are controlled through a single word line WL 0  in a lateral direction. Memory cells MC 10 -MC 12  are controlled through a single word line WL 1  in a lateral direction. Memory cells MC 20 -MC 22  are controlled through a single word line WL 2  in a lateral direction. One ends of the memory cells  11   p  are respectively connected to the bit lines BL 0 -BL 3  via the two selecting transistors TL and TR. Another ends of the memory cells  11   p  are connected to a common source line SL. The bit lines Bl 0 -BL 3  are connected to one end of the common sense amplifier  16  via the bit line selecting transistors  13   p . The bit line selecting transistors  13   p  are respectively controlled through the bit line selecting lines YG 0 -YG 3 . The sense amplifier  16  comprises a circuit for discharging the voltage of the bit line. Another end of the sense amplifier  16  is connected to the reference  17 . A result of comparison of the contents of the memory cells  11   p  to the reference  17  in the sense amplifier  16  is outputted from a data output terminal Dout which is an output terminal of the sense amplifier  16 . 
     Furthermore, the reference  17  may be any of a current source, a memory cell and a transistor capable of outputting an intermediate current between a cell current of the memory cell which retains “1” data and a cell current of the memory cell  11   p  which retains “0” data. The reference  17  may be a voltage source having an intermediate voltage between the bit-line voltage in the reading operation with respect to the memory cell  11   p  retaining the “1” data and the bit-line voltage in the reading operation with respect to the memory cell  11   p  retaining the “0” data. Further, the reference  17  may be configured in such a manner that two selecting transistors are connected to one end of the reference cell or memory cell and the two selecting transistors are alternately switched over every time when the data is read from the memory cell so that they can be connected to the different bit lines in the same manner as the configuration of the memory cells described earlier. Like this, there is no special limitation to the reference  17  as far as it serves as a comparison reference for deciding the data of the memory cells  11   p  by the sense amplifier  16 . 
     The bit lines BL 0 -BL 3  are connected respectively to the charging/discharging circuit  10  via the charging bit line selecting transistors  14   p . The charging bit line selecting transistors  14   p  are respectively controlled through the charging bit line selecting lines CH 0 -CH 3 . When the voltages of the bit lines BL 0 -BL 3  are set to a predetermined voltage, the charging bit line selecting transistors  14   p  are selected. The charging/discharging circuit  10  has a function of pre-charging the bit-line voltage to the predetermined voltage. 
     A reading operation with respect to the Pch memory cell  11   p  is carried out as below. In a reading mode, the voltage of the source line SL and the voltages of all of the bit lines are set to a power-supply voltage, a predetermined voltage (for example, 1V) is applied to the selected word line, and the power-supply voltage is applied to the nonselective word line. When the clock signal falls, the selecting transistor  12   p , bit line selecting transistor  13   p  and word line in accordance with the inputted address are selected. Accordingly, the voltage of the selected bit line further drops from the power-supply voltage by function of a discharging circuit provided in the sense amplifier  16 . At the time, the cell current in accordance with the data stored in the selected memory cell  11   p  flows in the selected bit line, and the voltage of the selected bit line thereby changes. The cell current or the voltage of the selected bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. 
       FIG. 12  shows timings of voltage variations in the respective wirings when the data in the memory cells MC 00 , MC 01 , MC 11  and MC 22  is sequentially read as an example of the random reading operation in the circuit configuration shown in  FIG. 11 . A description is given below provided that the address latch control signal AL is regarded as the clock signal and the address determination signal reset signal RAJ is regarded as the mode signal in the address determination circuit  8  shown in  FIG. 2 . The description is further given based on the assumption that the address determination signal control signal CAJ shifts to the “H” state and the address determination signal AJ becomes valid before the address latch is released after the comparison of the address signals is carried out as shown in the signal timings of  FIG. 3 . In  FIG. 12 , the variation timing of the address determination signal control signal CAJ is omitted. 
     When the operation shifts to the reading mode based on the mode signal (address determination signal reset signal RAJ), the output of the address determination circuit  8  is reset and shifts to the “L” state. Further, the voltage of the source line SL is set to the power-supply voltage and the charging bit line selecting lines CH 0 -CH 3  are all selected by the time when the address that selects the memory cell MC 00  is inputted. As a result, the voltages of all of the bit lines BL 0 -BL 3  are charged to the power-supply voltage. 
     Meanwhile, the power-supply voltage is applied to the word lines WL 0 -WL 2  (period T 1 ). The address that selects the memory cell MC 00  inputted during the period T 1  is transmitted to the row decoder  2  and the column decoder  3  via the address latch circuit  9 , and the word lines and bit lines in accordance with the inputted address are decoded. During the period, the address is not latched in the address latch circuit  9  because the clock signal is in the “H” state. 
     Next, when the clock signal falls, the address latch becomes valid, and the address that selects the memory cell MC 00  is latched in the address latch circuit  9 . A predetermined voltage is applied to the word line WL 0 , the charging bit line selecting line CH 0  becomes nonselective, and the bit line selecting line YG 0  is selected. Then, the voltage of the bit line BL 0  further drops from the power-supply voltage by the function of the discharging circuit in the sense amplifier  16 . 
     Next, the selecting transistor control line SG 0  is selected and the selecting transistors TL 0 -TL 2  are turned on, and the bit line BL 0  and the source line SL are thereby connected to each other via the memory cell MC 00 . At the time, the cell current in accordance with the data stored in the memory cell MC 00  flows in the bit line BL 0 , which changes the voltage of the bit line BL 0 . The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. Then, the read data showing the determination result is outputted from the data output terminal Dout (period T 2 ). 
     During the period T 2 , the bit line selecting lines YG 1 -YG 3  are in the nonselective state. Therefore, the bit lines BL 1 -BL 3  are not discharged through the discharging circuit in the sense amplifier  16 . Further, at the time, the selecting transistor control line SG 0  is selected so that the selecting transistors TL 01  and TL 02  are also turned on. However, the voltages of the bit lines BL 1  and BL 2  are maintained to be the power-supply voltage because the voltage of the source line SL is the power-supply voltage. Further, the charging bit line selecting lines CH 1 -CH 3  are selected at the time. In other words, the bit lines BL 1 -BL 3  maintain the power-supply voltage during the period T 2 . 
     Further, the address that selects the memory cell MC 01  is inputted while the data in the memory cell MC 00  is being read during the period T 2 . The address retained in the address latch circuit  9  (select address of the memory cell MC 00 ) is valid because the clock signal is in the “L” state during the period T 2 . Therefore, the selection of the word lines and bit lines is not immediately switched over by the select address of the memory cell MC 01  inputted from the address signal AD. The select address of the memory cell MC 01  is transmitted to the address determination circuit  8  and compared to the select address of the memory cell MC 00  retained in the address latch circuit  9 . The comparison is carried out based on the determination whether or not the bit line used in the current reading operation and the bit line used in the next reading operation are the same. When the data in the memory cell MC 01  is read, the bit line BL 1  is used in the case where the selecting transistor TL 01  is selected. Because the bit line BL 1  is different from the bit line BL 0  used in the reading operation with respect to the memory cell MC 00 , the determination result by the address determination circuit  8  shows the inconsistency. When the address determination signal AJ shows the inconsistency, the selecting transistor control line and the bit line selecting line are not switched over, and the selecting transistor control line SG 0  and the bit line selecting line YG 1  are used in the reading operation with respect to the memory cell MC 01 . 
     Next, when the reading operation with respect to the memory cell MC 00  is completed and the clock signal rises, the address latch is released, and the word lines and bit lines are decoded in the row decoder  2  and the column decoder  3  in accordance with the address that selects the memory cell MC 01  and the address determination signal AJ. Further, the selecting transistor control line SG 0  becomes nonselective since the word line WL 0  becomes nonselective. Then, the selecting transistors TL 00 -TL 02  are turned off, and the charging bit line selecting line CH 0  is selected. As a result, the voltage of the bit line BL 0  is reset to the power-supply voltage (period T 3 ). 
     During the period T 3 , after the address decoding in the row decoder  2  and the column decoder  3  is completed, the data in the memory cell MC 01  is read before the reset of the voltage of the bit line BL 0  is completed. When the data in the memory cell MC 01  is read, first, the clock signal falls, and the select address of the memory cell MC 01  is latched in the address latch circuit  9 . Then, the word lien WL 0  is selected, and the charging bit line selecting line CH 1  becomes nonselective. As a result, the bit line selecting line YG 1  is selected. 
     Further, when the selecting transistor control line SG 0  is selected and the selecting transistors TL 0 -TL 2  are turned on, the voltage of the bit line BL 1  further drops from the power-supply voltage by the function of the discharging circuit in the sense amplifier  16 . At the time, the cell current in accordance with the data stored in the memory cell MC 01  flows in the bit line BL 1 , and the voltage of the bit line BL 1  thereby changes. The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. The read data showing the determination result is outputted from the data output terminal Dout. 
     Meanwhile, while the data in the memory cell MC 01  is being read, the reset of the voltage of the bit line BL 0  is completed, and the voltage of the bit line BL 0  is set to the power-supply voltage. Further, while the data in the memory cell MC 01  is being read, the address that selects the memory cell MC 11  is inputted. In a manner similar to the reading operation with respect to the memory cell MC 00 , the select address of the memory cell MC 11  is compared to the select address of the memory cell MC 01  retained in the address latch circuit  9 . When the data in the memory cell MC 11  is read in the state where the selecting transistor TL 11  is selected, the bit line BL 1  is used, which is the same as the bit line BL 1  used in the reading operation with respect to the memory cell MC 01 . Therefore, the determination result by the address determination circuit  8  shows the consistency. At the time, the selecting transistor control line and the bit line selecting line are changed over, and as a result, the selecting transistor control line SG 2  and the bit line selecting line YG 2  are used in the reading operation of the memory cell MC 11 . 
     When the reading operation with respect to the memory cell MC 01  is completed and the clock signal rises, the address latch is released, and the word lines and bit lines are decoded in the row decoder  2  and the column decoder  3  in accordance with the address that selects the memory cell MC 11  and the address determination signal AJ. Further, the selecting transistor control line SG 0  becomes nonselective, the selecting transistors TL 00 -TS 02  are turned off, and the charging bit line selecting line CH 1  is selected. As a result, the voltage of the bit line BL 1  is reset to the power-supply voltage. 
     Next, while the voltage of the bit line BL 1  is being reset, the data in the memory cell MC 11  is read. In the reading operation with respect to the memory cell MC 11 , first, the clock signal falls, and the select address of the memory cell MC 11  is latched in the address latch circuit  9 . Then, the word line WL 1  is selected, the charging bit line selecting line CH 2  becomes nonselective, and the selecting transistor control line SG 2  is selected. As a result, the selecting transistors TL 20 -TL 22  and TR 10 -TR 12  are turned on. Further, the bit line selecting line YG 2  is selected, and the voltage of the bit line BL 2  further drops from the power-supply voltage by the function of the discharging circuit in the sense amplifier  16 . At the time, the cell current in accordance with the data stored in the memory cell MC 11  flows in the bit line BL 2 , and the voltage of the bit line BL 2  thereby changes. The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. Then, the read data showing the determination result is outputted from the data output terminal Dout. Because the bit line BL 2  is used in the reading operation with respect to the memory cell MC 11 , the data in the memory cell MC 11  can be read even during the period when the voltage of the bit line BL 1  is being reset. 
     During the period when the data is read from the memory cell MC 11  as described above, as the bit line selecting lines YG 0 , YG 1  and YG 3  are in the nonselective state, the bit lines BL 0 , BL 1  and BL 3  are not discharged by the function of the discharging circuit in the sense amplifier  16 . Further, the selecting transistor control line SG 2  is selected so that the selecting transistors TL 20 -TL 22  and TR 10 -TR 12  are turned on. However, the voltages of the bit lines BL 1  and BL 3  are not changed by the memory cells MC 10  and MC 12  and maintain the power-supply voltage because the voltage of the source line SL is the power-supply voltage. 
     Meanwhile, there is no flow of the cell current from the memory cell MC 22  even if the selecting transistor TL 22  is turned on because the word line WL 2  is in the nonselective state. Therefore, the voltage of the bit line BL 2  used in the reading operation with respect to the memory cell MC 11  is not thereby affected. Further, the charging bit line selecting lines CH 0 , CH 1  and CH 3  are selected, and the bit lines BL 0 , BL 1  and BL 3  maintain the power-supply voltage during the period when the data in the memory cell MC 11  is read. Therefore, the bit line BL 2  and the power-supply voltage are not short-circuited. 
     Next, while the data is being read from the memory cell MC 11 , the address that selects the memory cell MC 22  is inputted. In a manner similar to the foregoing description, the select address of the memory cell MC 22  is compared to the select address of the memory cell MC 11  retained in the address latch circuit  9 . In the state where the selecting transistor TR 22  is selected, the bit line BL 3  is used in the reading operation with respect to the memory cell MC 22 . The bit line BL 3  is different from the bit line BL 2  used in the reading operation with respect to the memory cell MC 11 , and therefore, the determination result by the address determination circuit  8  shows the inconsistency. Accordingly, the selecting transistor control line and the bit line selecting line are not changed over, and the selecting transistor control line SG 3  and the bit line selecting line YG 3  are used when the data is read from the memory cell MC 22 . 
     When the reading operation with respect to the memory cell MC 11  is completed and the clock signal rises, the address latch is released, and the word lines and bit lines are decoded in the row decoder  2  and the column decoder  3  in accordance with the address that selects the memory cell MC 11  and the address determination signal AJ. Further, the word line WL 1  becomes nonselective and the selecting transistor control line SG 1  also becomes nonselective. Then, the selecting transistors TL 20 -TL 22  and TR 10 -TR 12  are turned off, and the charging bit line selecting line CH 2  is selected. Accordingly, the voltage of the bit line BL 2  is reset to the power-supply voltage. The data in the memory cell MC 22  is read via the bit line BL 3  while the voltage of the bit line BL 2  is being reset. When the clock signal falls, the select address of the memory cell MC 22  is latched in the address latch circuit  9 , and then, the charging bit line selecting line CH 3  becomes nonselective and the selecting transistor control line SG 2  is selected. As a result, the selecting transistors TR 20 -TR 22  are turned on. Further, the bit line selecting line YG 3  is selected, and the voltage of the bit line BL 3  further drops from the power-supply voltage by the function of the discharging circuit in the sense amplifier  16 . At the time, the cell current in accordance with the data stored in the memory cell MC 22  flows in the bit line BL 3 , and the voltage of the bit line BL 3  thereby changes. The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. Then, the read data showing the determination result is outputted from the data output terminal Dout. 
     As described above, the selecting transistor control lines SG 2  [n] and SG [N+1] (n≧0) and the bit line selecting line YG [m] (m≧0) are switched over by the determination signal of the address determination circuit  8 . Thereby, the data in the next cell can be read while the voltage of the bit line after the reading operation is being reset, and the data can be randomly read at a high speed. 
     Additionally, the selecting transistors TL [n+1, m] and TR [n, m] (n≧0, m≧0) are commonly controlled by the selecting transistor control line SG [n+1] so that the number of the control lines can be reduced in comparison to the preferred embodiment 1. 
     In the foregoing description of the preferred embodiment 2, the Pch transistor constitutes the selecting transistor  12 , bit line selecting transistor  13  and charging bit line selecting transistor  14  shown in  FIG. 10 , and one Pch non-volatile memory cell constitutes the memory cell  11 , however, at least two Pch non-volatile memory cells may constitute the memory cell  11 . The structure of the memory cell is not particularly limited, and, for example, the NOR structure may be adopted. The present preferred embodiment is not limited to the Pch non-volatile memory cell as described earlier, and even at least one of depression non-volatile memory controllable by only the selected word line, can be applied. More specifically, the present preferred embodiment can be applied to a semiconductor memory device comprising memory cells controllable by only the selected word line in which it is unnecessary to pre-charge the voltage of the bit line to a predetermined voltage before the reading operation. Such a semiconductor memory device can also randomly read data at a high speed in a similar operation. 
     Preferred Embodiment 3 
       FIG. 13  shows a schematic plan structure of a memory cell array according to a preferred embodiment 3 of the present invention. As shown in  FIG. 13 , a semiconductor memory device according to the present preferred embodiment has a memory cell array  1   c  comprising memory cells with source terminals s 1 . Two selecting transistors TL [n, m] and TR [n, m] (n≧0, m≧0) are connected to a first terminal of a memory cell MR [n, m]. The selecting transistors TL [n, m] are connected to first bit lines BL [m], and the selecting transistors TR [n, m] are connected to second bit lines BL [m+1]. The selecting transistors TL [n+1, m], TR [n+1, m], TL [n, m+1] and TR [n, m+1] are controlled by the selecting transistor control lines GL [n+1] and GR [n+1]. For example, the selecting transistor control line GL 1  controls the selecting transistors TL 10 , TL 01  and TL 12 , and the selecting transistor control line GR 1  controls the selecting transistors TR 10 , TR 01  and TR 12 . An end of a sense amplifier  16  is connected to the respective bit lines BL [m] via bit line selecting transistors  13  controlled by bit line selecting lines YG [m]. A reference  17  is connected to another end of the sense amplifier  16 . The respective bit lines BL [m] are connected to a charging/discharging circuit  10  via charging bit line selecting transistors  14   a  controlled by charging bit line selecting lines CH [m] and reset bit line selecting transistors  14   b  controlled by reset bit line selecting lines RS [m]. The charging/discharging circuit  10  pre-charges and resets voltages of the bit lines BL [m]. When the voltage of the bit line BL [m] is set to a predetermined voltage, the charging bit line selecting transistor  14   a  is selected. When the voltage of the bit line [M] is reset, the reset bit line selecting transistor  14   b  is selected. 
     There is no particular limitation to the present preferred embodiment, however, at least one of capacitor, depression non-volatile memory, Nch non-volatile memory, Pch non-volatile memory or resistance-variable non-volatile memory (RRAM), which are controllable by only the selected word line, can be applied to the memory cell array  1   c  shown in  FIG. 13 . In other words, any memory cell capable of storing “0” and “1” data can be adopted as the memory cell  11 . Further, there is no particular limitation to a type of the memory cell  11 , to which any of NOR, NAND and AND memory cells is applicable. It is good that the memory cell array  1   c  is configured in such a manner that the memory cells are connected to the source and bit lines. 
     In  FIG. 14 , the constitution shown in  FIG. 13  is developed in such a manner that Nch non-volatile memory cells  11   n  are applied to the memory cells  11 . In the drawing, an Nch transistor constitutes a selecting transistor  12   n , a bit line selecting transistor  13   n , a charging bit line selecting transistor  14   a , and a reset bit line selecting transistor  14   b . The memory cell array  1   c  consists of at least one of Nch memory cell  11   n . Memory cells MC 00 -MC 02  are controlled through a single word line WL 0  in a lateral direction. Memory cells MC 10 -MC 12  are controlled through a single word line WL 1  in a lateral direction. Memory cells MC 20 -MC 22  are through a single word line WL 2  in a lateral direction. One ends of the memory cells  11   n  are respectively connected to the bit lines BL 0 -BL 3  via the two selecting transistors TL and TR. Another ends of the memory cells  11   n  are connected to a common source line SL. The bit lines Bl 0 -BL 3  are connected to one end of the common sense amplifier  16  via the bit line selecting transistors  13   n  respectively controlled by the bit line selecting lines YG 0 -YG 3 . Another end of the sense amplifier  16  is connected to the reference  17 . A result of comparison of the contents of the memory cells  11   n  to the reference  17  in the sense amplifier  16  is outputted from a data output terminal Dout which is an output terminal of the sense amplifier  16 . 
     The reference  17  may be any of a current source, a memory cell and a transistor capable of outputting an intermediate current between a cell current of the memory cell  11   n  which retains “1” data and a cell current of the memory cell  11   n  which retains “0” data. The reference  17  may be a voltage source having an intermediate voltage between the bit-line voltage in the reading operation with respect to the memory cell  11   n  retaining the “1” data and the bit-line voltage in the reading operation with respect to the memory cell  11   n  retaining the “0” data. Further, the reference  17  may be configured in such a manner that two selecting transistors are connected to one end of the reference cell or memory cell and the two selecting transistors are alternately switched over every time when the data is read from the memory cell so that they can be connected to the different bit lines in the same manner as the configuration of the memory cells described earlier. Like this, structure of the reference  17  is not specially limited and it is good that it serves as a comparison reference when the data of the memory cells  11   n  are decided through the sense amplifier  16 . 
     The bit lines BL 0 -BL 3  are connected respectively to the charging/discharging circuit  10  via the charging bit line selecting transistors  14   a  and the reset bit line selecting transistors  14   b . The charging bit line selecting transistors  14   a  are respectively controlled through the charging bit line selecting lines CH 0 -CH 3 . The reset bit line selecting transistors  14   b  are respectively controlled by the reset bit line selecting lines RS 0 -RS 3 . When the voltages of the bit lines BL 0 -BL 3  are set to a predetermined voltage, the charging bit line selecting transistors  14   a  are selected. When the voltages of the bit lines BL 0 -BL 3  are reset to a predetermined voltage, the reset bit line selecting transistors  14   b  are selected. The charging/discharging circuit  10  has a function of pre-charging the bit-line voltage to the predetermined voltage. 
     A reading operation with respect to the Nch memory cell  11   n  is carried out as below. In a reading mode, the voltage of the source line SL is set to the ground voltage (0V). When the address is inputted and the selected memory cell is determined, the voltage of the bit line for the reading operation is set to a predetermined voltage (for example, 3V) by the charging bit line selecting transistor  14   a  selected based on the inputted address. 
     Next, a predetermined voltage (for example, 3V) is applied to the word line connected to the selected memory cell in accordance with the inputted address, and the bite line selecting transistor  13   n  and the selecting transistor  12   n  are selected. At the time, the selected bit line is connected to the source line SL via the selected memory cell  11   n . Therefore, the cell current in accordance with data stored in the selected memory cell  11   n  flows in the selected bit line, and the voltage of the selected bit line thereby changes. The cell current or the voltage of the selected bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. 
       FIG. 15  shows timings of voltage variations in the respective wirings when the data in the memory cells MC 00 , MC 12 , MC 11  and MC 21  is sequentially read as an example of the random reading operation, in the circuit configuration shown in  FIG. 14 . A description is given here provided that the address latch control signal AL is regarded as the clock signal and the address determination signal reset signal RAJ is regarded as the mode signal by use of the address determination circuit  8 ′ shown in  FIG. 6 . The description is further given based on the assumption that the address determination signal control signal CAJ shifts to the “H” state and the address determination signal AJ becomes valid by the time when the address latch is released after the address signals are compared as shown in the signal timings of  FIG. 3 . In  FIG. 15 , the variation timing of the address determination signal control signal CAJ is omitted. 
     When the operation shifts to the reading mode based on the mode signal (address determination signal reset signal RAJ), the output of the address determination circuit  8 ′ is reset and shifts to the “L” state. Further, the voltage of the source line SL is set to the ground voltage and the reset bit line selecting lines RS 0 -RS 3  are all selected by the time when the address that selects the memory cell MC 00  is inputted. As a result, the voltages of all of the bit lines BL 0 -BL 3  are set to the ground voltage. 
     Meanwhile, the ground voltage is applied to the word lines WL 0 -WL 2  (period T 1 ). The address that selects the memory cell MC 00  inputted during the period T 1  is transmitted to the row decoder  2  and the column decoder  3  via the address latch circuit  9 , and the word lines and bit lines are decoded in accordance with the inputted address. During the period, the address is not latched in the address latch circuit  9  because the clock signal is in the “H” state. When the decoding of the bit line is completed, the reset bit line selecting line RS 0  becomes nonselective, and the charging bit line selecting line CH 0  is selected. As a result, the voltage of the bit line BL 0  is pre-charged to a predetermined voltage. 
     Next, when the clock signal falls, the address latch becomes valid, and the address that selects the memory cell MC 00  is latched in the address latch circuit  9 . Further, a predetermined voltage is applied to the word line WL 0 , the charging bit line selecting line CH 0  becomes nonselective, and the bit line selecting line YG 0  is selected. Thereby, the sense amplifier  16  is connected to the bit line BL 0 . Further, the selecting transistor control line GL 0  is selected so that the selecting transistors TL 00  and TL 02  are selected. At the time, the bit line BL 0  is connected to the source line SL via the memory cell MC 00 , and the cell current in accordance with the data stored in the memory cell MC 00  flows in the bit line BL 0 , which changes the voltage of the bit line BL 0 . The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”, and the read data showing the determination result is outputted from the data output terminal Dout (period T 2 ). 
     During period T 2 , the word line WL 0  is selected so that the memory cells MC 01  and MC 02  are selected. However, the voltage of the bit lines BL 1  is changed through the memory cell MC 01  because the selecting transistor control line GL 1  is not selected. Further, the selecting transistor TL 02  is selected by selecting the selecting transistor control line GL 0 , and the bit line BL 2  and the source line SL are connected to each other via the memory cell MC 02 . However, there is no current flow from the bit line BL 2  to the source line SL because the reset bit line selecting line RS 2  is selected. As a result, the voltage of the bit line BL 2  is maintained to be the ground voltage. 
     During the period T 2 , the address that selects the memory cell MC 12  is inputted while the data in the memory cell MC 00  is being read. During the period T 2 , the clock signal is in the “L” state, and the address retained in the address latch circuit  9  (select address of the memory cell MC 00 ) thereby becomes valid. Therefore, the selection of the word and bit lines is not immediately switched over by the select address of the memory cell MC 12  inputted from the address signal AD. The select address of the memory cell MC 12  is transmitted to the address determination circuit  8 ′ and compared to the select address of the memory cell MC 00  retained in the address latch circuit  9 . The comparison is carried out when the bit line used in the current reading operation and the bit line used in the next reading operation are both even-numbered or odd-numbered. When the data in the memory cell MC 12  is read, the bit line BL 2  (even-numbered bit line) is used in the case where the selecting transistor TL 12  is selected. Because the bit line BL 2  is consistent with the bit line BL 0  (even-numbered bit line) used in the reading operation with respect to the memory cell MC 00 . Therefore, the determination result by the address determination circuit  8 ′ shows the consistency. When the address determination signal AJ shows the consistency, the selecting transistor control line and the bit line selecting line are switched over, and the selecting transistor control line GR 1  and the bit line selecting line YG 3  are used in the reading operation with respect to the memory cell MC 12  so that the data is read via the bit line BL 3 . The non-latched address and address determination signal AJ are transmitted to the decoding circuit of the charging bit line selecting lines CH 0 -CH 3  in the column decoder  3 , and the charging bit line selecting line CH 3  is selected, while the reset bit line selecting line RS 3  becomes nonselective. As a result, the bit line BL 3  is pre-charged. At the time, the reset bit line selecting line RS 0 , which is in the nonselective state in order to read the data from the memory cell MC 00 , remains nonselective. 
     Next, when the reading operation with respect to the memory cell MC 00  is completed and the clock signal rises, the address latch is released, and the word lines and bit lines are decoded in the row decoder  2  and the column decoder  3  in accordance with the address that selects the memory cell MC 12  and the address determination signal AJ. The word line WL 0  becomes nonselective, and the selecting transistor control line GL 0  becomes nonselective. As a result, the selecting transistors TL 00 -TL 02  are turned off and the reset voltage of the bit line RS 0  is selected. The voltage of the bit line BL 0  is then reset to the ground voltage. 
     At the time, the selective state of the charging bit line selecting line CH 3  and the nonselective state of the reset bit line selecting line RS 3  are maintained. After the address decoding with respect to the memory cell MC 12  is completed in the row decoder  2  and the column decoder  3 , the data in the memory cell MC 12  is read without waiting for completing the reset of the voltage of the bit line BL 0  (period T 3 ). 
     Because the clock signal falls during the period T 3 , the select address of the memory cell MC 12  is latched in the address latch circuit  9 , a predetermined voltage is applied to the word line WL 1 , the charging bit line selecting line CH 3  becomes nonselective, and the bit line selecting line YG 3  is selected. As a result, the selecting transistor control line GR 1  is selected so that the selecting transistors TR 10 , TR 01  and TR 12  are turned on. The data in the memory cell MC 12  is read by achieving the foregoing conditions. 
     At the time, the bit line BL 3  is connected to the source line SL via the memory cell MC 12 , and the cell current in accordance with the data stored in the memory cell MC 12  flows in the bit line BL 3 , which changes the voltage of the bit line BL 3 . The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. Then, the read data showing the determination result is outputted from the data output terminal Dout. 
     At the time, the memory cell MC 11  is also selected by selecting the word line WL 1 . However, the voltage of the bit line BL 2  is not changed by the memory cell MC 11  because the selecting transistor control line GR 2  is in the nonselective state. Further, the selecting transistor TR 01  is selected since the selecting transistor control line GR 1  is selected. However, the bit line BL 2  is not connected to the source line SL via the memory cell MC 01  because the word line WL 0  is nonselective. Therefore, the voltage of the bit line BL 2  is not changed. Further, the memory cell MC 10  is selected, the selecting transistor TR 10  is selected, and the bit line BL 1  and the source line SL are connected to each other via the memory cell MC 10 . However, there is no current flow from the bit line BL 1  to the source line SL because the reset bit line selecting line RS 1  is selected. As a result, the voltage of the bit line BL 1  is maintained to be the ground voltage. 
     While the data in the memory cell MC 12  is being read, the reset of the voltage of the bit line BL 0  is completed, and the voltage of the bit line BL 0  is set to the ground voltage. Further, while the data in the memory cell MC 12  is being read, the address that selects the memory cell MC 11  is inputted. In a manner similar to the reading operation with respect to the memory cell MC 00 , the select address of the memory cell MC 11  is compared to the select address of the memory cell MC 12  retained in the address latch circuit  9 . In the case where the selecting transistor TR 11  is selected, the bit line BL 2  (even-numbered bit line) is used in order to read the data from the memory cell MC 12 . The bit line BL 2  is not consistent with the bit line BL 3  (odd-numbered bit line) used for the reading operation with respect to the memory cell MC 12 . Therefore, the determination result of the address determination circuit  8 ′ shows the inconsistency. In a state where the address determination signal AJ shows the inconsistency, the selecting transistor control line and the bit line selecting line are not switched over, the selecting transistor control line GR 2  and the bit line selecting line YG 2  are used in the reading operation with respect to the memory cell MC 11 , and the data is read via the bit line BL 2 . The non-latched address and address determination signal AJ are transmitted to the decoding circuit of the charging bit line selecting lines CH 0 -CH 3  in the column decoder  3 , and the charging bit line selecting line CH 2  is selected, while the reset bit line selecting line RS 2  becomes nonselective. As a result, the bit line BL 2  is pre-charged. At the time, the reset bit line selecting line RS 3 , which is in the nonselective state in order to read the data from the memory cell MC 12 , remains nonselective. 
     Next, When the reading operation with respect to the memory cell MC 12  is completed and the clock signal rises, the address latch is released, and the word lines and bit lines are decoded in the row decoder  2  and the column decoder  3  in accordance with the address that selects the memory cell MC 11  and the address determination signal AJ. Further, the word line WL 1  becomes nonselective and the selecting transistor control line GR 1  becomes nonselective so that the selecting transistors TR 10 , TR 01  and TR 12  becomes nonselective, and the reset bit line selecting line RS 3  is selected. As a result, the voltage of the bit line BL 3  is reset to the ground voltage. 
     At the time, the selective state of the charging bit line selecting line CH 2  and the nonselective state of the reset bit line selecting line RS 2  are maintained. After the address decoding with respect to the memory cell MC 11  is completed in the row decoder  2  and the column decoder  3 , the data is read from the memory cell MC 11  without waiting for completing the reset of the voltage of the bit line BL 3 . 
     Further, as the clock signal falls at the time, the select address of the memory cell MC 11  is latched in the address latch circuit  9 , a predetermined voltage is applied to the word line WL 1 , the charging bit line selecting line CH 2  becomes nonselective, the bit line selecting line YG 2  is selected, and the selecting transistor control line GR 2  is selected. As a result, the transistors TR 20 , TR 11  and TR 22  are turned on, and the data is thereby read from the memory cell MC 11 . At the time, the bit line BL 2  is connected to the source line SL via the memory cell MC 11 , and the cell current in accordance with the data stored in the memory cell MC 11  flows in the bit line BL 2 , which changes the voltage of the bit line BL 2 . The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. The read data that shows the determination result is outputted from the data output terminal Dout. 
     At the time, the memory cells MC 10  and MC 12  are also selected because the word line WL 1  is selected. However, the voltages of the bit line BL 1  and the bit line BL 3  are not changed by the memory cells MC 10  and MC 12  since the selecting transistor control line GR 1  is in the nonselective state. Further, the selecting transistor control line GR 2  is selected so that the selecting transistors TR 20  and TR 22  are selected. However, the bit line BL 1  is not connected to the source line SL via the memory cell MC 20  because the word line WL 2  is in the nonselective state, and therefore, the bit line BL 3  is not connected to the source line SL via the memory cell MC 22 . 
     Therefore, the voltages of the bit line BL 1  and the bit line BL 3  are not changed. 
     In the meantime, while the data in the memory cell MC 11  is being read, the reset of the voltage of the bit line BL 3  is completed, and the voltage of the bit line BL 3  is set to the ground voltage. While the data in the memory cell MC 11  is being read, the address that selects the memory cell MC 21  is inputted. In a manner similar to the reading operation with respect to the memory cell MC 12 , the select address of the memory cell MC 21  is compared to the select address of the memory cell MC 11  retained in the address latch circuit  9 . When the data in the memory cell MC 21  is read in the state where the selecting transistor TR 21  is selected, the bit line BL 2  (even-numbered bit line) is used, and the bit line BL 2  is consistent with the bit line BL 2  (even-numbered bit line) used in the reading operation with respect to the memory cell MC 1 . Therefore, the determination result by the address determination circuit  8 ′ shows the consistency. When the address determination signal AJ shows the consistency, the selecting transistor control line and the bit line selecting line are switched over, and the selecting transistor control line GL 3  and the bit line selecting line YG 1  are used for the reading operation with respect to the memory cell MC 21 . The result of the reading operation is read via the bit line BL 1 . The non-latched address and address determination signal AJ are transmitted to the decoding circuit of the charging bit line selecting lines CH 0 -CH 3  in the column decoder  3 , and the charging bit line selecting line CH 1  is selected, while the reset bit line selecting line RS 1  becomes nonselective. As a result, the bit line BL 1  is pre-charged. At the time, the reset bit line selecting line RS 2 , which is in the nonselective state in order to read the data from the memory cell MC 11 , remains nonselective. 
     When the reading operation with respect to the memory cell MC 11  is completed and the clock signal rises, the address latch is released, and the word lines and bit lines are decoded in the row decoder  2  and the column decoder  3  in accordance with the address that selects the memory cell MC 21  and the address determination signal AJ. Further, the word line WL 1  becomes nonselective and the selecting transistor control line GR 2  becomes nonselective, and then, the selecting transistors TR 20 , TR 11  and TR 22  are turned off. The reset bit line selecting line RS 2  is selected, and the voltage of the bit line BL 2  is reset to the ground voltage. 
     At the time, the selective state of the charging bit line selecting line CH 1  and the nonselective state of the reset bit line selecting line RS 1  are maintained. After the address decoding with respect to the memory cell MC 21  is completed in the row decoder  2  and the column decoder  3 , the data is read from the memory cell MC 21  without waiting for completing the reset of the voltage of the bit line BL 2 . The data is read from the memory cell MC 21  by generating the following states. Namely, due to a falling edge of the clock signal, the select address of the memory cell MC 21  is latched in the address latch circuit  9 , a predetermined voltage is applied to the word line WL 2 , the charging bit line selecting line CH 1  becomes nonselective, the bit line selecting line YG 1  is selected, and the selecting transistor TL 21  is turned on based on the selection of the selecting transistor control line GL 3 . As a result, the reading operation from the memory cell MC 21  is carried out. 
     At the time, the bit line BL 1  is connected to the source line SL via the memory cell MC 21 , and the cell current in accordance with the data stored in the memory cell MC 21  flows in the bit line BL 1 , which changes the voltage of the bit line BL 1 . The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. The read data that shows the determination result is outputted from the data output terminal Dout. 
     As described above, the selecting transistor control lines GL and GR and the bit line selecting line YG are switched over based on the determination signal of the address determination circuit  8 ′ so that the bit line used in the reading operation is changed. Accordingly, the bit line of the next memory cell can be pre-charged during the reading operation with respect to the current memory cell, and the data can be read from the next memory cell while the voltage of the bit line after the reading operation is being reset. As a result, the data can be randomly read at a high speed. 
     In the foregoing description of the preferred embodiment 3, it is shown the case wherein the Nch transistor constitutes the selecting transistor  12 , bit line selecting transistor  13  and charging bit line selecting transistor  14  shown in  FIG. 13 , however, the Pch transistor may constitute these transistors. Further, the case wherein one Nch non-volatile memory cell constitutes the memory cell array  1   c , is shown in the present preferred embodiment, however, the same performance is obtained even in the case wherein at least two of Nch non-volatile memory cells constitute the memory cell array  1   c . The structure of the memory cell array  1   c  is not particularly limited, and the NOR structure may be adopted. The present preferred embodiment is not limited to the Nch non-volatile memory cell and can be applied to at least one Pch non-volatile memory or resistance-variable non-volatile memory (RRAM), which are controllable by only the selected word line. More specifically, the present preferred embodiment can be applied to a semiconductor memory device comprising memory cells controllable by only the selected word line. Such a semiconductor memory device can also randomly read data at a high speed in a similar operation. 
     Preferred Embodiment 4 
       FIG. 16  shows a schematic plan structure of a memory cell array according to a preferred embodiment 4 of the present invention. As shown in  FIG. 16 , a semiconductor memory device according to the present preferred embodiment has a memory cell array  1   d  comprising memory cells with source terminals s 1 . Two selecting transistors TL [2n+2, 2m] and TR [2n+2, 2m] (n≧0, m≧0) are connected to first terminals of memory cells MR [2n+1, 2m] and MR [2n+2, 2m]. The selecting transistor TL [2n+2, 2m] is connected to first bit lines BL [2m], and the selecting transistor TR [2n+2, 2m] is connected to second bit lines BL [2m+1]. The selecting transistors TL [2n+2, 2m] and TR [2n+2, 2m] are controlled by the selecting transistor control lines GL [2n+2, 2] and GR [2n+2, 2]. Two selecting transistors TL [2n+1, 2m+1] and TR [2n+1, 2m+1] (n≧0, m≧0) are connected to first terminals of memory cells MR [2n, 2m+1] and MR [2n+1, 2m+1]. The selecting transistor TL [2n+1, 2m+1] is connected to first bit lines BL [2m+1], and the selecting transistor TR [2n+1, 2m+1] is connected to second bit lines BL [2m+2]. The selecting transistors TL [2n+1, 2m+1] and TR [2n+1, 2m+1] are controlled by the selecting transistor control lines GL [2n+1] and GR [2n+1]. For example, the selecting transistor control line GL 1  controls the selecting transistor TL 11 , and the selecting transistor control line GR 1  controls the selecting transistor TR 11 . An end of a sense amplifier  16  is connected to the respective bit lines BL [m] via bit line selecting transistors  13  controlled by bit line selecting lines YG [m]. A reference  17  is connected to another end of the sense amplifier  16 . The respective bit lines BL [m] are connected to a charging/discharging circuit  10  via charging bit line selecting transistors  14   a  controlled by charging bit line selecting lines CH [m] and reset bit line selecting transistors  14   b  controlled by reset bit line selecting lines RS [m]. The charging/discharging circuit  10  pre-charges and resets voltage of the bit line BL [m]. When the voltage of the bit line BL [m] is set to a predetermined voltage, the charging bit line selecting transistor  14   a  is selected. When the voltage of the bit line BL [m] is reset, the reset bit line selecting transistor  14   b  is selected. 
     There is no particular limitation to the present preferred embodiment, however, at least one of capacitor, depression non-volatile memory, Nch non-volatile memory, Pch non-volatile memory or resistance-variable non-volatile memory (RRAM), which is able to control only the selected word line, can be applied to the memory cell array  1   d  shown in  FIG. 16 . In other words, any memory cell capable of storing “0” and “1” data can be adopted as the memory cell  11 . Further, there is no particular limitation to a type of the memory cell  11 , to which any of NOR, NAND and AND memory cells is applicable. Basically, the memory cell array  1   d  is good if it is configured in such a manner that the memory cells are connected to the source lines and bit lines. 
     In  FIG. 17 , the constitution shown in  FIG. 16  is developed in such a manner that Nch non-volatile memory cells  11   n  are adopted as the memory cells  11 . In the drawing, an Nch transistor constitutes a selecting transistor  12   n , a bit line selecting transistor  13   n , a charging bit line selecting transistor  14   a , and a reset bit line selecting transistor  14   b . The memory cell array  1   c  comprises at least one of Nch memory cell  11   n . Memory cells MC 00 -MC 02  are controlled through a single word line WL 0  in a lateral direction. Memory cells MC 10 -MC 12  are controlled through a single word line WL 1  in a lateral direction. Memory cells MC 20 -MC 22  are horizontally controlled through a single word line WL 2  in a lateral direction. One ends of the memory cells  11   n  are respectively connected to the bit lines BL 0 -BL 3  via the two selecting transistors TL and TR. Another ends of the memory cells  11   n  are connected to a common source line SL. The bit lines Bl 0 -BL 3  are connected to one end of the common sense amplifier  16  via the bit line selecting transistors  13   n  respectively controlled by the bit line selecting lines YG 0 -YG 3 . Another end of the sense amplifier  16  is connected to the reference  17 . A result of comparison of the contents of the memory cells  11   n  to the reference  17  in the sense amplifier  16  is outputted from a data output terminal Dout which is an output terminal of the sense amplifier  16 . 
     The reference  17  may be any of a current source, a memory cell and a transistor capable of outputting an intermediate current between a cell current of the memory cell which retains “1” data and a cell current of the memory cell  11   p  which retains “0” data. Further, the reference  17  may be a voltage source having an intermediate voltage between the bit-line voltage in the reading operation with respect to the memory cell  11   n  retaining the “1” data and the bit-line voltage in the reading operation with respect to the memory cell  11   p  retaining the “0” data. Further, the reference  17  may be configured in such a manner that two selecting transistors are connected to one end of the reference cell or memory cell and the two selecting transistors are alternately switched every time when the data is read from the memory cell so that they can be connected to the different bit lines in the same manner as the configuration of the memory cells described earlier. As described above, any particular limitation is not given to the reference  17 , it is enough as far as it serves as a comparison reference for when the data of the memory cells  11   n  are judged by the sense amplifier  16 . 
     The bit lines BL 0 -BL 3  are connected to the charging/discharging circuit  10  respectively via the charging bit line selecting transistors  14   a  and the reset bit line selecting transistors  14   b . The charging bit line selecting transistors  14   a  are respectively controlled through the charging bit line selecting lines CH 0 -CH 3 . The reset bit line selecting transistors  14   b  are respectively controlled through the reset bit line selecting lines RS 0 -RS 3 . When the voltages of the bit lines BL 0 -BL 3  are set to a predetermined voltage, the charging bit line selecting transistors  14   a  are selected. When the voltages of the bit lines BL 0 -BL 3  are reset to a predetermined voltage, the reset bit line selecting transistors  14   b  are selected. The charging/discharging circuit  10  has a function of pre-charging and resetting the bit-line voltage to the predetermined voltage. 
     A reading operation with respect to the Nch memory cell  11   n  is carried out as described below. In a reading mode, the voltage of the source line SL is set to the ground voltage (0V). When the address is inputted and the selected memory cell is determined, the voltage of the bit line for the reading operation is set to a predetermined voltage (for example, 3V) by the charging bit line selecting transistor  14   a  selected based on the inputted address. 
     Next, a predetermined voltage (for example, 3V) is applied to the word line connected to the selected memory cell, and the bite line selecting transistor  13   n  and the selecting transistor  12   n  in accordance with the inputted address are selected. At the time, the selected bit line is connected to the source line SL via the selected memory cell  11   n . Therefore, the cell current in accordance with data stored in the selected memory cell flows in the selected bit line, and the voltage of the selected bit line thereby changes. The cell current or the voltage of the selected bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. 
       FIG. 18  shows timings of voltage variations in the respective wirings when the data in the memory cells MC 00 , MC 12 , MC 11  and MC 21  is sequentially read, which is an example of the random reading operation, in the circuit configuration shown in  FIG. 17 . A description is given below provided that the address determination circuit  8 ′ shown in  FIG. 6  is used, the address latch control signal AL is regarded as the clock signal and the address determination signal reset signal RAJ is regarded as the mode signal. The description is further based on the assumption that the address determination signal control signal CAJ shifts to the “H” state and the address determination signal AJ becomes valid by the time when the address latch is released after the address signals are compared as shown in the signal timings of  FIG. 3 . In  FIG. 18 , the variation timing of the address determination signal control signal CAJ is omitted. 
     When the operation shifts to the reading mode based on the mode signal (address determination signal reset signal RAJ) at first, the output of the address determination circuit  8 ′ is reset and shifts to the “L” state. Further, the voltage of the source line SL is set to the ground voltage and the reset bit line selecting lines RS 0 -RS 3  are all selected by before the address which selects the memory cell MC 00  is inputted. As a result, all of the bit lines BL 0 -BL 3  are set to the ground voltage. 
     Meanwhile, the ground voltage is applied to the word lines WL 0 -WL 3  (period T 1 ). The address that selects the memory cell MC 00  inputted during the period T 1  is transmitted to the row decoder  2  and the column decoder  3  via the address latch circuit  9 , and the word lines and bit lines in accordance with the inputted address are decoded. During the period, the address is not latched in the address latch circuit  9  because the clock signal is in the “H” state. When the decoding of the bit line is completed, the reset bit line selecting line RS 0  becomes nonselective, and the charging bit line selecting line CH 0  is selected. As a result, the voltage of the bit line BL 0  is pre-charged to a predetermined voltage. 
     Next, when the clock signal falls, the address latch becomes valid, and the address that selects the memory cell MC 00  is latched in the address latch circuit  9 . Further, a predetermined voltage is applied to the word line ML 0 , the charging bit line selecting line CH 0  becomes nonselective, and the bit line selecting line YG 0  is selected. Thereby, the sense amplifier  16  is connected to the bit line BL 0 . Further, the selecting transistors TL 00  and TL 02  are selected after the selecting transistor control line GL 0  is selected. At the time, the bit line BL 0  is connected to the source line SL via the memory cell MC 00 , and the cell current in accordance with the data stored in the memory cell MC 00  flows in the bit line BL 0 , which changes the voltage of the bit line BL 0 . The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. Then, the read data showing the determination result is outputted from the data output terminal Dout (period T 2 ). 
     During the period T 2 , the word line WL 0  is selected so that the memory cells MC 01  and MC 02  are selected. However, the voltage of the bit line BL 1  is not changed through the memory cell MC 01  because the selecting transistor control line GL 1  is the nonselective state. Further, the selecting transistor TL 02  is selected since the selecting transistor control line GL 0  is selected, and the bit line BL 2  and the source line SL are connected to each other via the memory cell MC 02 . However, there is no current flow from the bit line BL 2  to the source line SL because the reset bit line selecting line RS 2  is selected. As a result, the voltage of the bit line BL 2  is maintained to be the ground voltage. 
     During the period T 2 , the address that selects the memory cell MC 12  is inputted while the data in the memory cell MC 00  is being read. During the period T 2 , the clock signal is in the “L” state, and the address retained in the address latch circuit  9  (address that selects the memory cell MC 00 ) is thereby valid. Therefore, the selection of the word lines and bit lines is not immediately switched over by the address that selects the memory cell MC 12  inputted from the address signal AD. The select address of the memory cell MC 12  is transmitted to the address determination circuit  8 ′ and compared to the select address of the memory cell MC 00  retained in the address latch circuit  9 . The comparison is carried out based on the determination whether or not the bit line used in the current reading operation and the bit line used in the next reading operation are both even-numbered or odd-numbered. When the data in the memory cell MC 12  is read, the bit line BL 2  (even-numbered bit line) is used in the case where the selecting transistor TL 22  is selected. Because the used bit line BL 2  is consistent with the bit line BL 0  (even-numbered bit line) used in the reading operation with respect to the memory cell MC 00 , the determination result by the address determination circuit  8  shows the consistency. When the address determination signal AJ shows the consistency, the selecting transistor control line and the bit line selecting line are switched over, and the selecting transistor control line GR 2  and the bit line selecting line YG 3  are used in the reading operation with respect to the memory cell MC 12 . Then, the data is read via the bit line BL 3 . The non-latched address and address determination signal AJ are transmitted to the decoding circuit of the charging bit line selecting lines CH 0 -CH 3  in the column decoder  3 , and the charging bit line selecting line CH 3  is selected. Thereby, the reset bit line selecting line RS 3  becomes nonselective. As a result, the bit line BL 3  is pre-charged. At the time, the reset bit line selecting line RS 0 , which is in the nonselective state in order to read the data from the memory cell MC 00 , remains nonselective. 
     Next, when the reading operation with respect to the memory cell MC 00  is completed and the clock signal rises, the address latch is released, and the word lines and bit lines are decoded in the row decoder  2  and the column decoder  3  in accordance with the address that selects the memory cell MC 12  and the address determination signal AJ. The word line WL 0  becomes nonselective, and the selecting transistor control line GL 0  becomes nonselective. As a result, the selecting transistors TL 00 -TL 02  are turned off, and the reset bit line selecting line RS 0  is selected. The voltage of the bit line BL 0  is then reset to the ground voltage. 
     At the time, the selective state of the charging bit line selecting line CH 3  and the nonselective state of the reset bit line selecting line RS 3  are maintained. After the address decoding with respect to the memory cell MC 12  is completed in the row decoder  2  and the column decoder  3 , the data in the memory cell MC 12  is read without waiting for completing the reset of the bit line BL 0  (period T 3 ). 
     Because the clock signal falls during the period T 3 , the address that selects the memory cell MC 12  is latched in the address latch circuit  9 , a predetermined voltage is applied to the word line WL 1 , the charging bit line selecting line CH 3  becomes nonselective, the bit line selecting line YG 3  is selected, and the selecting transistor control line GR 2  is selected. As a result, the selecting transistors TR 20  and TR 22  are turned on. After the aforementioned state is achieved, the data in the memory cell MC 12  is read. 
     At the time, the bit line BL 3  is connected to the source line SL via the memory cell MC 12 , and the cell current in accordance with the data stored in the memory cell MC 12  flows in the bit line BL 3 , which changes the voltage of the bit line BL 3 . The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. Then, the read data showing the determination result is outputted from the data output terminal Dout. 
     At the time, the memory cell MC 11  is also selected since the word line WL 1  is selected. However, the voltage of the bit line BL 2  is not changed through the memory cell MC 11  because the selecting transistor control line GR 1  is nonselective. Further, the word line WL 1  is selected so that the memory cell MC 10  is selected and the selecting transistor control line GR 2  is selected so that the selecting transistor TR 20  is thereby selected. The bit line BL 1  and the source line SL are connected to each other via the memory cell MC 10 . However, there is no current flow from the bit line BL 1  to the source line SL because the reset bit line selecting line RS 1  is selected. As a result, the voltage of the bit line BL 1  is maintained to be the ground voltage. 
     In the meantime, while the data in the memory cell MC 12  is being read, the reset of the voltage of the bit line BL 0  is completed, and the voltage of the bit line BL 0  is set to the ground voltage. Further, while the data in the memory cell MC 12  is being read, the address that selects the memory cell MC 11  is inputted. In a manner similar to the reading operation with respect to the memory cell MC 00 , the select address of the memory cell MC 11  is compared to the select address of the memory cell MC 12  retained in the address latch circuit  9 . In the case where the selecting transistor TR 11  is selected, the bit line BL 2  (even-numbered bit line) is used in order to read the data from the memory cell MC 11 . The bit line BL 2  is inconsistent with the bit line BL 3  (odd-numbered bit line) used for the reading operation with respect to the memory cell MC 12 . Therefore, the determination result by the address determination circuit  8 ′ shows the inconsistency. Under the state where the address determination signal AJ shows the inconsistency, the selecting transistor control line and the bit line selecting line are not switched over, and the selecting transistor control line GR 1  and the bit line selecting line YG 2  are used in the reading operation with respect to the memory cell MC 11 . The data is then read from the bit line BL 2 . The non-latched address and address determination signal AJ are transmitted to the decoding circuit of the charging bit line selecting lines CH 0 -CH 3  in the column decoder  3 , the charging bit line selecting line CH 2  is selected, and then the reset bit line selecting line RS 2  becomes nonselective. As a result, the bit line BL 2  is pre-charged. At the time, the reset bit line selecting line RS 3 , which is in the nonselective state in order to read the data from the memory cell MC 12 , remains nonselective. 
     Next, when the reading operation with respect to the memory cell MC 12  is completed and the clock signal rises, the address latch is released, and the word lines and bit lines are decoded in the row decoder  2  and the column decoder  3  in accordance with the address that selects the memory cell MC 11  and the address determination signal AJ. Further, the word line WL 1  becomes nonselective and the selecting transistor control line GR 2  becomes nonselective so that the selecting transistors TR 20  and TR 22  become nonselective, and the reset bit line selecting line RS 3  is selected. As a result, the voltage of the bit line BL 3  is reset to the ground voltage. 
     At the time, the selection of the charging bit line selecting line CH 2  and the nonselective state of the reset bit line selecting line RS 2  are maintained. After the address decoding with respect to the memory cell MC 11  is completed in the row decoder  2  and the column decoder  3 , the data is read from the memory cell MC 11  without waiting for completing the reset of the voltage of the bit line BL 3 . At the time, the clock signal falls, and the select address of the memory cell MC 11  is latched in the address latch circuit  9 . Then, a predetermined voltage is applied to the word line WL 1 , the charging bit line selecting line CH 2  becomes nonselective, and the bit line selecting line YG 2  becomes selective. The selecting transistor TR 11  is turned on based on the selection of selecting transistor control line GR 1 , and then, the data is read from the memory cell MC 11 . 
     Further, the bit line BL 2  is connected to the source line SL via the memory cell MC 11  at the time, and the cell current in accordance with the data stored in the memory cell MC 11  flows in the bit line BL 2 , which changes the voltage of the bit line BL 2 . The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. The read data as the determination result is outputted from the data output terminal Dout. 
     At the time, the memory cells MC 10  and MC 12  are also selected because the word line WL 1  is selected. However, the voltages of the bit line BL 1  and the bit line BL 3  are not changed by the memory cells MC 10  and MC 12  since the selecting transistor control line GR 2  is in the nonselective state. 
     In the meanwhile, while the data in the memory cell MC 11  is being read, the reset of the voltage of the bit line BL 3  is completed, and the voltage of the bit line BL 3  is set to the ground voltage. Further, the address that selects the memory cell MC 21  is inputted while the data in the memory cell MC 11  is being read. In a manner similar to the reading operation with respect to the memory cell MC 12 , the select address of the memory cell MC 21  is compared to the select address of the memory cell MC 11  retained in the address latch circuit  9 . When the data in the memory cell MC 21  is read in the state where the selecting transistor TR 31  is selected, the bit line BL 2  (even-numbered bit line) is used, and the bit line BL 2  is consistent with the bit line BL 2  (even-numbered bit line) used in the reading operation with respect to the memory cell MC 11 . Therefore, the determination result by the address determination circuit  8 ′ shows the consistency. When the address determination signal AJ shows the consistency, the selecting transistor control line and the bit line selecting line are switched over, and the selecting transistor control line GL 3  and the bit line selecting line YG 1  are used for the reading operation with respect to the memory cell MC 21 . The result of the reading operation is read via the bit line BL 1 . The non-latched address and address determination signal AJ are transmitted to the decoding circuit of the charging bit line selecting lines CH 0 -CH 3  in the column decoder  3 , the charging bit line selecting line CH 1  is selected, and then the reset bit line selecting line RS 1  becomes nonselective. As a result, the bit line BL 1  is pre-charged. At the time, the reset bit line selecting line RS 2 , which is in the nonselective state in order to read the data from the memory cell MC 11 , remains nonselective. 
     When the reading operation with respect to the memory cell MC 11  is completed and the clock signal rises, and the address latch is released, the word lines and bit lines are decoded in the row decoder  2  and the column decoder  3  in accordance with the address that selects the memory cell MC 21  and the address determination signal AJ. Further, the word line WL 1  becomes nonselective and the selecting transistor control line GR 1  becomes nonselective. Thereby, the selecting transistors TR 11  is turned off, and the reset bit line selecting line RS 2  is selected. As a result, the voltage of the bit line BL 2  is reset to the ground voltage. 
     At the time, the selective state of the charging bit line selecting line CH 1  and the nonselective state of the reset bit line selecting line RS 1  are maintained. After the address decoding with respect to the memory cell MC 21  is completed in the row decoder  2  and the column decoder  3 , the data is read from the memory cell MC 21  without waiting for completing the reset of the voltage of the bit line BL 2 . The data is read from the memory cell MC 21  based on a generation of the following state. Namely, the clock signal falls, the address which selects the memory cell MC 21  is latched in the address latch circuit  9 , a predetermined voltage is applied to the word line WL 2 , the charging bit line selecting line CH 1  becomes nonselective, the bit line selecting line YG 1  is selected, and the selecting transistor TL 31  is turned on based on the selection of the selecting transistor control line GL 3 . As a result, the data is read from the memory cell MC 21 . 
     At the time, the bit line BL 1  is connected to the source line SL via the memory cell MC 21 , and the cell current in accordance with the data stored in the memory cell MC 21  flows in the bit line BL 1 , which changes the voltage of the bit line BL 1 . The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. The read data as the determination result is outputted from the data output terminal Dout. 
     As described above, the selecting transistor control lines GL and GR and the bit line selecting lines YG are switched over by the determination signal of the address determination circuit  8 ′ so that the bit lines used in the reading operation are switched. Accordingly, the voltage of the bit line of the next memory cell can be pre-charged during the reading operation with respect to the current memory cell, and the data can be read from the next memory cell while the voltage of the bit line after the reading operation with respect to the memory cell is being reset. As a result, the data can be randomly read at a high speed. 
     Further, the number of the selecting transistors controlled by one selecting transistor control line can be reduced in comparison to the preferred embodiment 3, which can make capacitance loads of the selecting transistor control lines decrease much more. 
     The preferred embodiment 4 shows the case that the Nch transistors constitute the selecting transistor  12 , bit line selecting transistor  13  and charging bit line selecting transistor  14   a  shown in  FIG. 16 , however, the Pch transistors may constitute these transistors. Further, one Nch non-volatile memory cell constitutes the memory cell array  1   d  according to the present preferred embodiment, however, at least two of Nch non-volatile memory cells may constitute the memory cell array  1   d . The structure of the memory cell array  1   d  is not particularly limited, and even the NOR structure may be adopted. The present preferred embodiment is not limited to the Nch non-volatile memory cell and can be applied to at least one of Pch non-volatile memory or resistance-variable non-volatile memory (RRAM), which are controllable by only the selected word line. In short, the present preferred embodiment can be applied to a semiconductor memory device comprising memory cells controllable by only the selected word line. Such a semiconductor memory device can also read randomly data at a high speed in a similar operation. 
     Preferred Embodiment 5 
       FIG. 19  shows a schematic plan structure of a memory cell array according to a preferred embodiment 5 of the present invention. As shown in  FIG. 19 , a semiconductor memory device according to the present preferred embodiment has a memory cell array  1   e  comprising memory cells with source terminals s 1 . Two selecting transistors TL [2n+2, 2m] and TR [2n+2, 2m] (n≧0, m≧0) are connected to first terminals of memory cells MR [2n+1, 2m] and [2n+2, 2m]. The selecting transistors TL [2n+2, 2m] are connected to first bit lines BL [2m], and the selecting transistors TR [2n+2, 2m] are connected to second bit lines BL [2m+1]. The selecting transistors TL [2n+2, 2m] and TR [2n+2, 2m] are controlled by the selecting transistor control lines SG [2n] and SG [2n+2]. Two selecting transistors TL [2n+1, 2m+1] and TR [2n+1, 2m+1] (n≧0, m≧0) are connected to first terminals of memory cells MR [2n, 2m+1] and MR [2n+1, 2m+1]. The selecting transistors TL [2n+1, 2m+1] are respectively connected to first bit lines BL [2m+1], and the selecting transistors TR [2n+1, 2m+1] are respectively connected to second bit lines BL [2m+2]. The selecting transistors TL [2n+1, 2m+1] and TR [2n+1, 2m+1] are controlled by the selecting transistor control lines SG [2n+1] and SG [2n+3]. For example, the selecting transistor control line SG 2  controls the selecting transistor TL 10 , TL 12 , TR 00  and TR 02 . An end of a sense amplifier  16  is connected to the respective bit lines BL [m] via bit line selecting transistors  13  controlled by bit line selecting lines YG [m]. A reference  17  is connected to another end of the sense amplifier  16 . The respective bit lines BL [m] are connected to a charging/discharging circuit  10  via charging bit line selecting transistors  14   a  controlled by charging bit line selecting lines CH [m] and reset bit line selecting transistors  14   b  controlled by reset bit line selecting lines RS [m]. The charging/discharging circuit  10  pre-charges and resets voltages of the bit lines BL [m]. When the voltage of the bit line BL [m] is set to a predetermined voltage, the charging bit line selecting transistor  14   a  is selected. When the voltage of the bit line BL [m] is reset, the reset bit line selecting transistor  14   b  is selected. 
     There is no particular limitation to the present preferred embodiment, however, at least one of capacitor, depression non-volatile memory, Nch non-volatile memory, Pch non-volatile memory or resistance-variable non-volatile memory (RRAM), which is able to select only the selected word line, can be applied to the memory cell array  1   e  shown in  FIG. 19 . In other words, any memory cell capable of storing “0” and “1” data can be adopted as the memory cell array  1   e . Further, there is no particular limitation to a type of the memory cell  11 , to which any of NOR, NAND and AND memory cells is applicable. The memory cell array  1   e  may be configured in such a manner that the memory cells are connected to the source and bit lines. 
     In  FIG. 20 , the constitution shown in  FIG. 19  is developed in such a manner that Nch non-volatile memory cells  11   n  are adopted as the memory cells  11 . In the drawing, an Nch transistor constitutes a selecting transistor  12   n , a bit line selecting transistor  13   n , a charging bit line selecting transistor  14   a , and a reset bit line selecting transistor  14   b . The memory cell array  1   c  comprises at least one of Nch memory cell  11   n . Memory cells MC 00 -MC 02  are controlled through a single word line WL 0  in a lateral direction. Memory cells MC 10 -MC 12  are controlled through a single word line WL 1  in a lateral direction. Memory cells MC 20 -MC 22  are horizontally controlled through a single word line WL 2  in a lateral direction. One ends of the memory cells  11   n  are respectively connected to the bit lines BL 0 -BL 3  via the two selecting transistors TL and TR. Another ends of the memory cells  11   n  are connected to a common source line SL. The bit lines Bl 0 -BL 3  are respectively connected to one end of the common sense amplifier  16  via the bit line selecting transistors  13   n  respectively controlled by the bit line selecting lines YG 0 -YG 3 . Another end of the sense amplifier  16  is connected to the reference  17 . A result of comparison of the contents of the memory cells  11   n  to the reference  17  in the sense amplifier  16  is outputted from a data output terminal Dout which is an output terminal of the sense amplifier  16 . 
     The reference  17  may be any of a current source, a memory cell and a transistor capable of outputting an intermediate current between a cell current of the memory cell which retains “1” data and a cell current of the memory cell  11   p  which retains “0” data. The reference  17  may be a voltage source having an intermediate voltage between the bit-line voltage in the reading operation with respect to the memory cell  11   n  retaining the “1” data and the bit-line voltage in the reading operation with respect to the memory cell  11   p  retaining the “0” data. Further, the reference  17  may be configured in such a manner that two selecting transistors are connected to one end of the reference cell or memory cell and the two selecting transistors are alternately switched every time when the data is read from the memory cell so that they can be connected to the different bit lines in the same manner as the configuration of the memory cells described earlier. Like this, the reference  17  is not specially limited, it is enough that it serves as a comparison reference when the data of the memory cells  11   n  are judged by the sense amplifier  16 . 
     The bit lines BL 0 -BL 3  are connected to the charging/discharging circuit  10  respectively via the charging bit line selecting transistors  14   a  and the reset bit line selecting transistors  14   b . The charging bit line selecting transistors  14   a  are controlled through the charging bit line selecting lines CH 0 -CH 3 . The reset bit line selecting transistors  14   b  are controlled through the reset bit line selecting lines RS 0 -RS 3 . When the voltages of the bit lines BL 0 -BL 3  are set to a predetermined voltage, the charging bit line selecting transistors  14   a  are selected. When the voltages of the bit lines BL 0 -BL 3  are reset to a predetermined voltage, the reset bit line selecting transistors  14   b  are selected. The charging/discharging circuit  10  has a function of pre-charging and resetting the bit-line voltage to the predetermined voltage. 
     A reading operation with respect to the Nch memory cell  11   n  is carried out as described below. In a reading mode, the voltage of the source line SL is set to the ground voltage (0V). When the address is inputted and the selected memory cell is determined, the voltage of the bit line for the reading operation is set to a predetermined voltage (for example, 3V) by the charging bit line selecting transistor  14   a  selected based on the inputted address. 
     Next, a predetermined voltage (for example, 3V) is applied to the word line connected to the selected memory cell, and the bite line selecting transistor  13   n  and the selecting transistor  12   n  in accordance with the inputted address are selected. At the time, the selected bit line is connected to the source line SL via the selected memory cell  11   n . As the cell current in accordance with data stored in the selected memory cell flows in the selected bit line, and the voltage of the selected bit line thereby changes. The cell current or the voltage of the selected bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. 
       FIG. 21  shows timings of voltage variations in the respective wirings when the data in the memory cells MC 00 , MC 12 , MC 11  and MC 21  is sequentially read as an example of the random reading operation, in the circuit configuration shown in  FIG. 20 . A description is given below provided that the address determination circuit  8 ′ shown in  FIG. 6  is used, the address latch control signal AL is regarded as the clock signal and the address determination signal reset signal RAJ is regarded as the mode signal. The description is further given based on the assumption that the address determination signal control signal CAJ shifts to the “H” state and the address determination signal AJ becomes valid by before the address latch is released after the address signals are compared as shown in the signal timings of  FIG. 3 . In  FIG. 21 , the variation timing of the address determination signal control signal CAJ is omitted. 
     When the operation shifts to the reading mode based on the mode signal (address determination signal reset signal RAJ) at first, the output of the address determination circuit  8 ′ is reset so as to shift to the “L” state. Further, the voltage of the source line SL is set to the ground voltage and the reset bit line selecting lines RS 0 -RS 3  are all selected by before the address that selects the memory cell MC 00  is inputted. As a result, the voltages of all of the bit lines BL 0 -BL 3  are set to the ground voltage. 
     Meanwhile, the ground voltage is applied to the word lines WL 0 -WL 3  (period T 1 ). The address that selects the memory cell MC 00  inputted during the period T 1  is transmitted to the row decoder  2  and the column decoder  3  via the address latch circuit  9 , and the word lines and bit lines are decoded in accordance with the inputted address. During the period, the address is not latched in the address latch circuit  9  because the clock signal is in the “H” state. When the decoding of the bit line is completed, the reset bit line selecting line RS 0  becomes nonselective, and the charging bit line selecting line CH 0  is selected. As a result, the voltage of the bit line BL 0  is pre-charged to a predetermined voltage. 
     Next, when the clock signal falls, the address latch becomes valid, and the address that selects the memory cell MC 00  is latched in the address latch circuit  9 . Further, a predetermined voltage is applied to the word line WL 0 , the charging bit line selecting line CH 0  becomes nonselective, and the bit line selecting line YG 0  is selected. Thereby, the sense amplifier  16  is connected to the bit line BL 0 . Further, the selecting transistor control line SG 0  is selected so that the selecting transistors TL 00  and TL 02  are selected. At the time, the bit line BL 0  is connected to the source line SL via the memory cell MC 00 , and the cell current in accordance with the data stored in the memory cell MC 00  flows in the bit line BL 0 , which changes the voltage of the bit line BL 0 . The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. Then, the read data as the comparison result is outputted from the data output terminal Dout (period T 2 ). 
     During the period T 2 , the word line WL 0  is selected so that the memory cells MC 01  and MC 02  are selected. However, the voltage of the bit line BL 1  is not changed by the memory cell MC 01  because the selecting transistor control line SG 1  is in the nonselective state. Further, the selecting transistor TR 02  is selected since the selecting transistor control line GL 0  is selected, and the bit line BL 2  and the source line SL are connected to each other via the memory cell MC 02 . However, there is no current-flow from the bit line BL 2  to the source line SL because the reset bit line selecting line RS 2  is selected. As a result, the voltage of the bit line BL 2  is maintained to be the ground voltage. 
     During the period T 2 , the address that selects the memory cell MC 12  is inputted while the data in the memory cell MC 00  is being read. During the period T 2 , the clock signal is in the “L” state, and the address retained in the address latch circuit  9  (select address of the memory cell MC 00 ) is thereby valid. Therefore, the selection of the word lines and bit lines is not immediately switched over by the select address of the memory cell MC 12  inputted from the address signal AD. The select address of the memory cell MC 12  is transmitted to the address determination circuit  8 ′ and compared to the select address of the memory cell MC 00  retained in the address latch circuit  9 . The comparison is carried out based on the judgment whether or not the bit line used in the current reading operation and the bit line used in the next reading operation are both even-numbered or odd-numbered. When the data in the memory cell MC 12  is read, the bit line BL 2  (even-numbered bit line) is used in the case where the selecting transistor TL 12  is selected. Because the used bit line BL 2  is consistent with the bit line BL 0  (even-numbered bit line) used in the reading operation with respect to the memory cell MC 00 , the determination result by the address determination circuit  8 ′ shows consistency. When the address determination signal AJ shows the consistency, the selecting transistor control line and the bit line selecting line are switched over, and the selecting transistor control line SG 4  and the bit line selecting line YG 3  are used in the reading operation with respect to the memory cell MC 12 . Then, the reading result is read via the bit line BL 3 . The non-latched address and address determination signal AJ are transmitted to the decoding circuit of the charging bit line selecting lines CH 0 -CH 3  in the column decoder  3 , the charging bit line selecting line CH 3  is selected, and then the reset bit line selecting line RS 3  becomes nonselective. As a result, the bit line BL 3  is pre-charged. At the time, the reset bit line selecting line RS 0 , which is in the nonselective state in order to read the data from the memory cell MC 00 , remains nonselective. 
     Next, when the reading operation with respect to the memory cell MC 00  is completed and the clock signal rises, the address latch is released, and the word lines and bit lines are decoded in the row decoder  2  and the column decoder  3  in accordance with the address that selects the memory cell MC 12  and the address determination signal AJ. The word line WL 0  becomes nonselective, and the selecting transistor control line SG 0  becomes nonselective. As a result, the selecting transistors TL 00 -TL 02  are turned off, and the reset bit line selecting line RS 0  is selected so that the voltage of the bit line BL 0  is reset to the ground voltage. 
     At the time, the selective state of the charging bit line selecting line CH 3  and the nonselective state of the reset bit line selecting line RS 3  are maintained. After the address decoding with respect to the memory cell MC 12  is completed in the row decoder  2  and the column decoder  3 , the data in the memory cell MC 12  is read without waiting for completing the reset of the bit line BL 0  (period T 3 ). 
     Because the clock signal falls during the period T 3 , the select address of the memory cell MC 12  is latched in the address latch circuit  9 , a predetermined voltage is applied to the word line WL 1 , the charging bit line selecting line CH 3  becomes nonselective, and the bit line selecting line YG 3  is selected. As a result, the selecting transistor control line SG 4  is selected so that the selecting transistors TR 10  and TR 12  are turned on. Then, the data in the memory cell MC 12  is read after achieving the aforementioned state. 
     At the time, the bit line BL 3  is connected to the source line SL via the memory cell MC 12 , and the cell current in accordance with the data stored in the memory cell MC 12  flows in the bit line BL 3 , which changes the voltage of the bit line BL 3 . The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. Then, the read data as the comparison result is outputted from the data output terminal Dout. 
     At the time, the memory cell MC 11  is also selected since the word line WL 1  is selected. However, the voltages of the bit lines BL 1  and BL 2  are not changed through the memory cell MC 11  because the selecting transistor control lines SG 1  and SG 3  are in the nonselective state. Further, the word ling WL 1  is selected so that the memory cell MC 10  is selected, and the selecting transistor TR 10  is selected based on the selection of the selecting transistor control line SG 4 . Accordingly, the bit line BL 1  and the source line SL are connected to each other via the memory cell MC 10 . However, there is no current flow from the bit line BL 1  to the source line SL because the reset bit line selecting line RS 1  is selected. As a result, the voltage of the bit line BL 1  is maintained to be the ground voltage. Further, the selecting transistor TR 21  is turned on since the selecting transistor control line SG 4  is selected. However, the bit line BL 2  and the source line SL are not connected via the memory cell MC 21  because the word line WL 2  is in the nonselective state. As a result, the voltage of the bit line BL 2  is maintained to be the ground voltage. 
     In the meantime, while the data in the memory cell MC 12  is being read, the reset of the voltage of the bit line BL 0  is completed, and the voltage of the bit line BL—is set to the ground voltage. Further, while the data in the memory cell MC 12  is being read, the address that selects the memory cell MC 11  is inputted. In a manner similar to the reading operation with respect to the memory cell MC 00 , the select address of the memory cell MC 11  is compared to the select address of the memory cell MC 12  retained in the address latch circuit  9 . In the case where the selecting transistor TR 01  is selected, the bit line BL 2  (even-numbered bit line) is used in order to read the data from the memory cell MC 11 . The bit line BL 2  is inconsistent with the bit line BL 3  (odd-numbered bit line) used for the reading operation with respect to the memory cell MC 12 . Therefore, the determination result by the address determination circuit  8 ′ shows the inconsistency. When the address determination signal AJ shows the inconsistency, the selecting transistor control line and the bit line selecting line are not switched over, and the selecting transistor control line SG 3  and the bit line selecting line YG 2  are used in the reading operation with respect to the memory cell MC 11 , and the data is read via the bit line BL 2 . The non-latched address and address determination signal AJ are transmitted to the decoding circuit of the charging bit line selecting lines CH 0 -CH 3  in the column decoder  3 , the charging bit line selecting line CH 2  is selected, and then the reset bit line selecting line RS 2  becomes nonselective. As a result, the bit line BL 2  is pre-charged. At the time, the reset bit line selecting line RS 3 , which is in the nonselective state in order to read the data from the memory cell MC 12 , remains nonselective. 
     Next, when the reading operation with respect to the memory cell MC 12  is completed and the clock signal rises, the address latch is released, and the word lines and bit lines are decoded in the row decoder  2  and the column decoder  3  in accordance with the address that selects the memory cell MC 11  and the address determination signal AJ. Further, the word line WL 1  becomes nonselective and the selecting transistor control line SG 4  becomes nonselective so that the selecting transistors TR 10  and TR 12  are turned off, and the reset bit line selecting line RS 3  is selected. As a result, the voltage of the bit line BL 3  is reset to the ground voltage. 
     At the time, the selective state of the charging bit line selecting line CH 2  and the nonselective state of the reset bit line selecting line RS 2  are maintained. After the address decoding with respect to the memory cell MC 11  is completed in the row decoder  2  and the column decoder  3 , the data is read from the memory cell MC 11  without waiting for completing the reset of the voltage of the bit line BL 3 . At the time, the clock signal falls, and the select address of the memory cell MC 11  is latched in the address latch circuit  9 . Then, a predetermined voltage is applied to the word line WL 1 , the charging bit line selecting line CH 2  becomes nonselective, and the bit line BL 2  is selected. The selecting transistor TR 01  is selected based on the selection of the selecting transistor control line SG 3 , and then, the data is read from the memory cell MC 11 . 
     Further, the bit line BL 2  is connected to the source line SL via the memory cell MC 11  at this time, and the cell current in accordance with the data stored in the memory cell MC 11  flows in the bit line BL 2 , which changes the voltage of the bit line BL 2 . The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. The read data as the determination result is outputted from the data output terminal Dout. 
     At the time, the memory cells MC 10  and MC 12  are also selected because the word line WL 1  is selected. However, the voltages of the bit lines BL 0 , BL 1  and BL 3  are not changed through the memory cells MC 10  and MC 12  since the selecting transistor control lines SG 2  and SG 4  are in the nonselective state. 
     Further, the selecting transistor control line SG 3  is selected so that the selecting transistor TL 21  is selected. However, the bit line BL 1  is not connected to the source line SL via the memory cell MC 21  because the word line WL 2  is in the nonselective state. As a result, the voltage of the bit line BL 1  is maintained to be the ground voltage. 
     On one hand, while the data in the memory cell MC 11  is being read, the reset of the voltage of the bit line BL 3  is completed, and the voltage of the bit line BL 3  is set to the ground voltage. Further, the address that selects the memory cell MC 21  is inputted while the data in the memory cell MC 11  is being read. In a manner similar to the reading operation with respect to the memory cell MC 12 , the select address of the memory cell MC 21  is compared to the select address of the memory cell MC 11  retained in the address latch circuit  9 . When the data in the memory cell MC 21  is read in the state where the selecting transistor TR 21  is selected, the bit line BL 2  (even-numbered bit line) is used, and the bit line BL 2  is consistent with the bit line BL 2  (even-numbered bit line) used in the reading operation with respect to the memory cell MC 11 . Therefore, the determination result by the address determination circuit  8 ′ shows the consistency. When the address determination signal AJ shows the consistency, the selecting transistor control line and the bit line selecting line are switched over, and the selecting transistor control line SG 3  and the bit line selecting line YG 1  are used in the reading operation with respect to the memory cell MC 21 . The result of the reading operation is read from the bit line BL 1 . The non-latched address and address determination signal AJ are transmitted to the decoding circuit of the charging bit line selecting lines CH 0 -CH 3  in the column decoder  3 , the charging bit line selecting line CH 1  is selected, and then the reset bit line selecting line RS 1  becomes nonselective. As a result, the bit line BL 1  is pre-charged. At the time, the reset bit line selecting line RS 2 , which is in the nonselective state in order to read the data from the memory cell MC 11 , remains nonselective. 
     Next, when the reading operation with respect to the memory cell MC 11  is completed and the clock signal rises, and the address latch is released, and the word lines and bit lines are decoded in the row decoder  2  and the column decoder  3  in accordance with the address that selects the memory cell MC 21  and the address determination signal AJ. Further, the word line WL 1  becomes nonselective and the selecting transistor control line SG 3  becomes nonselective so that the selecting transistor TR 01  is turned off. The reset bit line selecting line RS 2  is selected, and the voltage of the bit line BL 2  is reset to the ground voltage. 
     At the time, the selective state of the charging bit line selecting line CH 1  and the nonselective state of the reset bit line selecting line RS 1  are maintained. After the address decoding with respect to the memory cell MC 21  is completed in the row decoder  2  and the column decoder  3 , the data is read from the memory cell MC 21  without waiting for completing the reset of the voltage of the bit line BL 2 . The data is read from the memory cell MC 21  based on a generation of the following state. The clock signal falls, the select address of the memory cell MC 21  is latched in the address latch circuit  9 , a predetermined voltage is applied to the word line WL 2 , the charging bit line selecting line CH 1  becomes nonselective, the bit line BL 1  is selected, and the selecting transistor TL 21  is selected based on the selection of the selecting transistor control line SG 3 . Accordingly, the data is read from the memory cell MC 21 . 
     At the time, the bit line BL 1  is connected to the source line SL via the memory cell MC 21 , and the cell current in accordance with the data stored in the memory cell MC 21  flows in the bit line BL 1 , which changes the voltage of the bit line BL 1 . The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. The read data as the determination result is outputted from the data output terminal Dout. 
     As described above, the selecting transistor control lines SG and the bit line selecting lines YG are switched over by the determination signal of the address determination circuit  8 ′, the voltage of the bit line of the next memory cell can be pre-charged during the reading operation with respect to the current memory cell through switching over the bit lines used in the reading operation. In addition, the data can be read from the next memory cell while the voltage of the bit line after the reading operation with respect to the memory cell is being reset. As a result, the data can be randomly read at a high speed. 
     Further, the number of the control lines can be reduced in comparison to the preferred embodiment 4 in such a manner that the selecting transistors TL [n+2, m] and TR [n, m] (n≧0, m≧=0) are commonly controlled by the selecting transistor control lines SG [n+3]. 
     In the foregoing description of the preferred embodiment 5, the Nch transistors constitute the selecting transistor  12 , bit line selecting transistor  13  and charging bit line selecting transistor  14   a  shown in  FIG. 13 , however, the Pch transistors may constitute these transistors. Further, one Nch non-volatile memory cell constitutes the memory cell array  1   e  in the present preferred embodiment, however, it can be implemented as same even in the case where at least two of Nch non-volatile memory cells may constitute the memory cell array  1   e . The structure of the memory cell array  1   e  is not particularly limited, and, for example, the NOR structure may be adopted. The present preferred embodiment is not limited to the Nch non-volatile memory cell and even at least one of Pch non-volatile memory or resistance-variable non-volatile memory (RRAM), which are able to control only the selected word line, can be applied. More specifically, the present preferred embodiment can be applied to a semiconductor memory device comprising memory cells capable of controlling only the selected word line. Such a semiconductor memory device can also randomly read data at a high speed in a similar operation. 
     Preferred Embodiment 6 
       FIG. 22  shows a schematic plan structure of a memory cell array according to a preferred embodiment 6 of the present invention. As shown in  FIG. 22 , a semiconductor memory device according to the present preferred embodiment has a memory cell array  1   f  with memory cells. Two selecting transistors TL [n, 2m] and TR [n, 2m] (n≧0, m≧0) are connected to a first terminal of a memory cell MR [n, 2m]. Two selecting transistors TL [n, 2m+2] and TR [n, 2m+2] (n≧0, m≧0) are connected to a second terminal of the memory cell MR [n, 2m]. The selecting transistors TL [n, 2m] are connected to first bit lines BL [2m], and the selecting transistors TR [n, 2m] are connected to second bit lines BL [2m+1]. The selecting transistors TL [n, 2m+2] are connected to third bit lines BL [2m+2]. The selecting transistors TR [n, 2m+2] are connected to fourth bit lines BL [2m+3]. The selecting transistors TL [n, 2m], TR [n, 2m], TL [n, 2m+2], TR [n, 2m+2] are controlled by the selecting transistor control lines GL [n] and GR [n]. Two selecting transistors TL [n, 2m+1] and TR [n, 2m+1] (n≧0, m≧0) are connected to a first terminal of a memory cell MR [n, 2m+1]. Two selecting transistors TL [n, 2m+3] and TR [n, 2m+3] (n≧0, m≧0) are connected to a second terminal of the memory cell MR [n, 2m+1]. The selecting transistors TL [n, 2m+1] are connected to first bit lines BL [2m+1]. The selecting transistors TR [n, 2m+1] are connected to second bit lines BL [2m+2]. The selecting transistors TL [n, 2m+3] are connected to third bit lines BL [2m+3]. The selecting transistors TR [n, 2m+3] are connected to fourth bit lines BL [2m+4]. The selecting transistors TL [n, 2m+1], TR [n, 2m+1], TL [n, 2m+3] and TR [n, 2m+3] are controlled by the selecting transistor control lines GL [n+1] and GR [n+1]. For example, the selecting transistor control line GL 1  controls the selecting transistors TL 01 , TL 03 , TL 05 , TL 10 , TL 12  and TL 14 , and the selecting transistor control line GR 1  controls the selecting transistors TR 01 , TR 03 , TR 05 , TR 10 , TR 12  and TR 14 . An end of a sense amplifier  16  is connected to the respective bit lines BL [m] via bit line selecting transistors  13  controlled by bit line selecting lines YG [m]. A reference  17  is connected to another end of the sense amplifier  16 . The respective bit lines BL [m] are connected to a charging/discharging circuit  10  via source line selecting transistors  14   c  controlled by source line selecting lines SS [m] and drain line selecting transistors  14   d  controlled by drain line selecting lines DS [m]. The charging/discharging circuit  10  has a function of applying a source voltage and a drain voltage to the bit lines BL [m]. When the voltage of the bit line BL [m] is set to the source voltage, the source line selecting transistor  14   c  is selected. When the voltage of the bit line BL [m] is set to the drain voltage, the drain line selecting transistor  14   d  is selected. 
     There is no particular limitation to the present preferred embodiment, however, at least one of Nch non-volatile memory, Pch non-volatile memory or resistance-variable non-volatile memory (RRAM), which are able to control only the selected word line, can be applied to the memory cells shown in  FIG. 22 . In other words, any memory cell capable of storing and reading “0” and “1” data can be applied to the memory cell array  1   f.    
     In  FIG. 23 , the constitution shown in  FIG. 22  is developed in such a manner that Nch non-volatile memory cells  11   n  are adopted as the memory cells  11 . In the drawing, an Nch transistor constitutes a selecting transistor  12   n , a bit line selecting transistor  13   n , a source selecting transistor  14   c , and a drain line selecting transistor  14   d . The memory cell array if comprises at least one of Nch memory cell  11   n . Memory cells MC 00 -MC 03  are controlled through a single word line WL 0  in a lateral direction. Memory cells MC 10 -MC 13  are controlled through a single word line WL 1  in a lateral direction. Memory cells MC 20 -MC 23  are controlled through a single word line WL 2  in a lateral direction. One ends of the memory cells  11   n  are respectively connected to any of the bit lines BL 0 -BL 6  via the two selecting transistors TL and TR. Another ends of the memory cells  11   n  are respectively connected to any of the bit lines BL 0 -BL 6  via the two selecting transistors TL and TR. The bit lines Bl 0 -BL 6  are respectively connected to one end of the common sense amplifier  16  via the bit line selecting transistors  13   n  respectively controlled by the bit line selecting lines YG 0 -YG 6 . Another end of the sense amplifier  16  is connected to the reference  17 . A result of comparison of the contents of the memory cells  11   n  to the reference  17  in the sense amplifier  16  is outputted from a data output terminal Dout which is an output terminal of the sense amplifier  16 . 
     The reference  17  may be any of a current source, a memory cell and a transistor which are respectively capable of outputting an intermediate current between a cell current of the memory cell which retains “1” data and a cell current of the memory cell  11   p  which retains “0” data. The reference  17  may be a voltage source having an intermediate voltage between the bit-line voltage in the reading operation with respect to the memory cell  11   n  retaining the “1” data and the bit-line voltage in the reading operation with respect to the memory cell  11   p  retaining the “0” data. Further, the reference  17  may be configured in such a manner that two selecting transistors are connected to one end of the reference cell or memory cell and the two selecting transistors are alternately switched every time when the data is read from the memory cell so that they can be connected to the different bit lines in the same manner as the configuration of the memory cells described earlier. Like this, the reference  17  is not specially limited, and it is enough that it serves as a comparison reference when the data of the memory cells  11   n  are judged by the sense amplifier  16 . 
     The bit lines BL 0 -BL 6  are connected to the charging/discharging circuit  10  respectively via the source line selecting transistors  14   c  and the drain line selecting transistors  14   d . The source line selecting transistors  14   c  are respectively controlled through the source line selecting lines SS 0 -SS 6 . The drain line selecting transistors  14   d  are respectively controlled through the drain line selecting lines DS 0 -DS 3 . When the source voltage is applied to the voltages of the bit lines BL 0 -BL 6 , the source line selecting transistors  14   c  are selected. When the drain voltage is applied to the voltages of the bit lines BL 0 -BL 6 , the drain line selecting transistors  14   d  are selected. The charging/discharging circuit  10  has a function of setting the bit-line voltage to a predetermined voltage. 
     A reading operation with respect to the VGA memory cell  11   n , for example, in the case of source sensing, is carried out as described below. The drain line and the source line of the memory cell is determined based on the inputted address, and the drain line selecting line  14   d  is selected so that the voltage of the drain line is pre-charged to a predetermined voltage (for example, 1V). The source line selecting line  14   c  is selected so that the voltage of the source line is set to the ground voltage (0V) so as to serve as the bit line for reading the data in the memory cell. 
     Next, a predetermined voltage (for example, 3V) is applied to the selected word line in accordance with the inputted address, and the bite line selecting transistor  13   n  and the selecting transistor  12   n  are selected. At the time, the drain line is connected to the source line via the selected memory cell  11   n . Therefore, the cell current in accordance with data stored in the selected memory cell flows in the source line, and the voltage of the source line thereby changes. The cell current or the voltage of the source line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. 
       FIG. 24  shows timings of voltage variations in the respective wirings when the data in the memory cells MC 00 ( 0 ), MC 01 ( 0 ), MC 11 ( 0 ), MC 11 ( 1 ), MC 13 ( 0 ) and MC 12 ( 1 ) is sequentially read as an example of the random reading operation, in the circuit configuration shown in  FIG. 23 . However, in the reading operation, the memory cell where the first terminal of the memory cell is used as the source line and the second terminal thereof is used as the drain line and the memory cell where the first terminal of the memory cell is used as the drain line and the second terminal thereof is used as the source line are distinguished. For example, the memory cell MC 00  is designated as the MC 00 ( 0 ) in the case where the bit line BL 0  or BL 1  is used as the source line and the bit line BL 2  or BL 3  is used as the drain line, in the meanwhile, the memory cell MC 00  is designated as the MC 00 ( 1 ) in the case where the bit line BL 0  or BL 1  is used as the drain line and the bit line BL 2  or BL 3  is used as the source line. 
     A description is given below provided that the address latch control signal AL is regarded as the clock signal and the address determination signal reset signal RAJ is regarded as the mode signal in addition to use the address determination circuit  8 ′ shown in  FIG. 6 . The description is further given based on the assumption that the address determination signal control signal CAJ shifts to the “H” state and the address determination signal AJ becomes valid by before the address latch is released after the address signals are compared as shown in the signal timings of  FIG. 3 . In  FIG. 24 , the variation timing of the address determination signal control signal CAJ is omitted. 
     When the operation shifts to the reading mode based on the mode signal (address determination signal reset signal RAJ) at first, the output of the address determination circuit  8 ′ is reset so as to shift to the “L” state. Further, the source line selecting lines SS 0 -SS 6  are all selected by before the address that selects the memory cell MC 00 ( 0 ) is inputted so that the voltages of all of the bit lines BL 0 -BL 6  are set to the ground voltage. The ground voltage is applied to the word lines WL 0 -WL 6 . 
     Next, when the address that selects the memory cell MC 00 ( 0 ) is inputted, the inputted address is transmitted to the row decoder  2  and the column decoder  3  via the address latch circuit  9 , and the word lines and bit lines are decoded in accordance with the inputted address. When the decoding of the bit line is completed, the source line selecting line SS 2  becomes nonselective, and the drain line selecting line DS 2  is selected. As a result, the voltage of the bit line BL 2  is pre-charged to the drain voltage. At the same time, the source line selecting line SS 4  becomes nonselective and the drain line selecting line DS 4  is selected so that the bit line BL 4  is pre-charged to the drain voltage (period T 1 ). During the period T 1 , the address is not latched in the address latch circuit  9  because the clock signal is in the “H” state. 
     Next, when the clock signal falls, the address latch becomes valid, and the address that selects the memory cell MC 00 ( 0 ) is latched in the address latch circuit  9 , and a predetermined voltage is applied to the word line WL 0  simultaneously. Further, the source line selecting line SS 0  becomes nonselective, and the bit line selecting line YG 0  is selected. Thereby, the sense amplifier  16  is connected to the bit line BL 0 . Further, the selecting transistor control line GL 0  is selected so that the selecting transistors TL 00 , TL 02  and TL 04  are selected. At the time, the bit line BL 2  (drain line) is connected to the bit line BL 0  (source line) via the memory cell MC 00 , and the cell current in accordance with the data stored in the memory cell MC 00  flows in the bit line BL 0 , which changes the voltage of the bit line BL 0 . The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. Then, the read data as the comparison result is outputted from the data output terminal Dout (period T 2 ). 
     During the period T 2 , though the word line WL 0  is selected so that the memory cells MC 01 , MC 02  and MC 03  are selected, the voltages of the bit lines BL 1 -BL 6  are not changed by the memory cells MC 01  and MC 03  because the selecting transistor control lines GL 1  and GR 1  are in the nonselective state. Further, the selecting transistors TL 00 , TL 02  and TL 04  are selected since the selecting transistor control line GL 0  is selected, and the bit line BL 4  is connected to the bit line BL 2  via the memory cell MC 02 . However, there is no current flow in the memory cell MC 02  because the drain voltage is applied to the bit lines BL 2  and BL 4 , which causes no influence on the reading operation with respect to the memory cell MC 00 . 
     During the period T 2 , the address that selects the memory cell MC 01 ( 0 ) is inputted while the data in the memory cell MC 00 ( 0 ) is being read. During the period T 2 , the clock signal is in the “L” state, and the address retained in the address latch circuit  9  (select address of the memory cell MC 00 ( 0 )) is thereby valid. Therefore, the selective state of the word lines and bit lines is not immediately switched over by the select address of the memory cell MC 01 ( 0 ) inputted from the address signal AD. The select address of the memory cell MC 01 ( 0 ) is transmitted to the address determination circuit  8 ′ and compared to the select address of the memory cell MC 00 ( 0 ) retained in the address latch circuit  9 . The comparison is carried out based on the judgment whether or not the bit line used in the current reading operation and the bit line used in the next reading operation are both even-numbered or odd-numbered. When the data in the memory cell MC 01 ( 0 ) is read, the bit line BL 1  (odd-numbered bit line) is used in the case where the selecting transistor TL 01  is selected. Because the used bit line BL 1  is inconsistent with the bit line BL 0  (even-numbered bit line) used in the reading operation with respect to the memory cell MC 00 ( 0 ), the determination result by the address determination circuit  8  shows the inconsistency. When the address determination signal AJ shows the inconsistency, the selecting transistor control line and the bit line selecting line are not switched over, and the selecting transistor control line GL 1  and the bit line selecting line YG 1  are used in the reading operation with respect to the memory cell MC 01 ( 0 ). Then, the result of the reading operation is read from the bit line BL 1 . The non-latched address and address determination signal AJ are transmitted to the decoding circuit of the source line selecting lines SS 0 -SS 6  and the drain line selecting lines DS 0 -DS 6  in the column decoder  3 , and the source line selecting lines SS 3  and SS 5  become nonselective, thereafter the drain line selecting lines DS 3  and DS 5  are selected. As a result, the bit lines BL 3  and BL 5  are pre-charged to the drain voltage. At the time, the source line selecting line SS 0 , which is in the nonselective state in order to read the data from the memory cell MC 00 ( 0 ), remains nonselective, and the drain lines DS 2  and DS 4  are continuously selected. 
     When the reading operation with respect to the memory cell MC 00 ( 0 ) is completed and the clock signal rises, the address latch is released, the word lines and bit lines are decoded in the row decoder  2  and the column decoder  3  in accordance with the address that selects the memory cell MC 01 ( 0 ) and the address determination signal AJ. The word line WL 0  becomes nonselective, and the selecting transistor control line GL 0  becomes nonselective. As a result, the selecting transistors TL 00 , TL 02  and TL 04  are turned off, and the source line selecting lines SS 0 , SS 2  and SS 4  are selected. The voltages of the bit lines BL 0 , BL 2  and BL 4  are then reset to the ground voltage. 
     At the time, the selective state of the drain line selecting lines DS 3  and DS 5  and the nonselective state of the source line selecting lines SS 3  and SS 5  are maintained. After the address decoding with respect to the memory cell MC 01 ( 0 ) is completed in the row decoder  2  and the column decoder  3 , the data in the memory cell MC 01 ( 0 ) is read without waiting for completing the reset of the voltages of the bit lines BL 0 , BL 2  and BL 4  (period T 3 ). 
     Because the clock signal falls during the period T 3 , the select address of the memory cell MC 01 ( 0 ) is latched in the address latch circuit  9 , a predetermined voltage is applied to the word line WL 1 , the source line selecting line SS 1  becomes nonselective, and the bit line selecting line YG 1  is selected. As a result, the sense amplifier  16  is connected to the bit line BL 1 . Further, the selecting transistor control line GL 1  is selected so that the selecting transistors TL 10 , TL 03  and TL 05  are selected. At the time, the bit line BL 3  (drain line) is connected to the bit line BL 1  (source line) via the memory cell MC 01 . Therefore, the cell current in accordance with data stored in the memory cell MC 01  flows in the bit line BL 1 , and the voltage of the bit line BL 1  thereby changes. The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. The read data as the comparison result is outputted from the data output terminal Dout. 
     At the time, the memory cells MC 00 , MC 01 , MC 02  and MC 03  are also selected since the word line WL 1  is selected. However, the voltages of the bit lines BL 0 -BL 5  are not changed through the memory cells MC 00  and MC 03  because the selecting transistor control lines GL 0  and GR 0  are in the nonselective state. Further, the selecting transistors TL 10 , TL 12 , TL 14 , TL 01 , TL 03  and TL 05  are selected since the selecting transistor control line GL 1  is selected, and the bit line BL 5  is connected to the bit line BL 3  via the memory cell MC 03 . However, there is no current flow in the memory cell MC 03  because the drain voltage is applied to both the bit lines BL 3  and BL 5 , and the reading operation with respect to the memory cell MC 01  is not thereby affected. Further, the reset of the voltages of the bit lines BL 0 , BL 2  and BL 4  is completed while the data in the memory cell MC 01 ( 0 ) is being read, and the voltages of the bit lines BL 0 , BL 2  and BL 4  are set to the ground voltage. Further, the address that selects the memory cell MC 11 ( 0 ) is inputted while the data in the memory cell MC 01 ( 0 ) is being read. In a manner similar to the reading operation with respect to the memory cell MC 00 ( 0 ), the select address of the memory cell MC 11 ( 0 ) is compared to the select address of the memory cell MC 00 ( 0 ) retained in the address latch circuit  9 . When the data in the memory cell MC 11 ( 0 ) is read, the bit line BL 1  (odd-numbered bit line) is used in the case where the selecting transistor TL 11  is selected. Because the used bit line BL 1  is consistent with the bit line BL 1  (odd-numbered bit line) used in the reading operation with respect to the memory cell MC 01 ( 0 ), the determination result by the address determination circuit  8  shows the consistency. When the address determination signal AJ shows the consistency, the selecting transistor control lines and the bit line selecting lines are switched over, and the selecting transistor control line GR 2  and the bit line selecting line YG 2  are used in the reading operation with respect to the memory cell MC 11 ( 0 ). Then, the data is read from the bit line BL 2 . The non-latched address and address determination signal AJ are transmitted to the decoding circuit of the source line selecting lines SS 0 -SS 6  and the drain line selecting lines DS 0 -DS 6  in the column decoder  3 , and the source line selecting lines SS 4  and SS 6  become nonselective, thereafter the drain line selecting lines DS 4  and DS 6  are selected. As a result, the bit lines BL 4  and BL 6  are pre-charged to the drain voltage. At the time, the source line selecting line SS 1 , which is in the nonselective state in order to read the data from the memory cell MC 01 ( 0 ), remains nonselective, and the drain lines DS 3  and DS 5  are continuously selected. 
     Next, when the reading operation with respect to the memory cell MC 01 ( 0 ) is completed and the clock signal rises, the address latch is released, the word lines and the bit lines are decoded in the row decoder  2  and the column decoder  3  in accordance with the address that selects the memory cell MC 11 ( 0 ) and the address determination signal AJ. The word line WL 0  becomes nonselective, and the selecting transistor control line GL 1  becomes nonselective. As a result, the selecting transistors TL 10 , TL 12 , TL 14 , TL 01 , TL 03  and TL 05  are turned off, and the source line selecting lines SS 1 , SS 3  and SS 5  are selected. The voltages of the bit lines BL 1 , BL 3  and BL 5  are then reset to the ground voltage. 
     At the time, the selective state of the drain line selecting lines DS 4  and DS 6  and the nonselective state of the source line selecting lines SS 4  and SS 6  are maintained. After the address decoding with respect to the memory cell MC 11 ( 0 ) is completed in the row decoder  2  and the column decoder  3 , the data in the memory cell MC 11 ( 0 ) is read without waiting for completing the reset of the voltages of the bit lines BL 1 , BL 3  and BL 5 . In the reading operation with respect to the memory cell MC 11 ( 0 ), the clock signal falls, the address that selects the memory cell MC 11 ( 0 ) is latched in the address latch circuit  9 , and a predetermined voltage is applied to the word line WL 1 . Further, the source line selecting line SS 2  becomes nonselective, and the bit line selecting line YG 2  is selected. As a result, the sense amplifier  16  is connected to the bit line BL 2 . Further, the selecting transistor control line GR 2  is selected so that the selecting transistors TR 20 , TR 22 , TR 24 , TR 11 , TR 13  and TR 15  are selected. At the time, the bit line BL 4  (drain line) is connected to the bit line BL 2  (source line) via the memory cell MC 11 . Therefore, the cell current in accordance with data stored in the memory cell MC 11  flows in the bit line BL 2 , and the voltage of the bit line BL 2  thereby changes. The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. The read data as the determination result is outputted from the data output terminal Dout. 
     At the time, the memory cells MC 10 , MC 11 , MC 12  and MC 13  are selected since the word line WL 1  is selected. However, the voltages of the bit lines BL 0 -BL 5  are not changed through the memory cells MC 10  and MC 12  because the selecting transistor control lines GL 1  and GR 1  are in the nonselective state. Further, the selecting transistors TR 20 , TR 22 , TR 24 , TR 11 , TR 13  and TR 15  are selected since the selecting transistor control line GR 2  is selected, and the bit line BL 6  is connected to the bit line BL 4  via the memory cell MC 13 . However, there is no current flow in the memory cell MC 13  because the drain voltage is applied to the bit lines BL 4  and BL 6 , and the reading operation with respect to the memory cell MC 11  is not thereby affected. Further, the reset of the voltages of the bit lines BL 1 , BL 3  and BL 5  is completed while the data in the memory cell MC 11 ( 0 ) is being read, and the voltages of the bit lines BL 1 , BL 3  and BL 5  are set to the ground voltage. Further, the address that selects the memory cell MC 11 ( 1 ) is inputted while the data in the memory cell MC 11 ( 0 ) is being read. The select address of the memory cell MC 11 ( 1 ) is compared to the select address of the memory cell MC 11 ( 0 ) retained in the address latch circuit  9 . When the data in the memory cell MC 11 ( 1 ) is read, the bit line BL 4  (even-numbered bit line) is used in the case where the selecting transistor TR 13  is selected. Because the used bit line BL 4  is consistent with the bit line BL 2  (even-numbered bit line) used in the reading operation with respect to the memory cell MC 11 ( 0 ), the determination result by the address determination circuit  8 ′ shows the consistency. When the address determination signal AJ shows the consistency, the selecting transistor control line and the bit line selecting line are switched over, and the selecting transistor control line GL 2  and the bit line selecting line YG 3  are used in the reading operation with respect to the memory cell MC 11 ( 1 ). Then, the result of the reading operation is read via the bit line BL 3 . The non-latched address and address determination signal AJ are transmitted to the decoding circuit of the source line selecting lines SS 0 -SS 6  and the drain line selecting lines DS 0 -DS 6  in the column decoder  3 , and the source line selecting line SS 1  becomes nonselective, then the drain line selecting lines DS 1  is selected. As a result, the voltage of the bit line BL 1  is pre-charged to the drain voltage. At the time, the source line selecting line SS 2 , which is in the nonselective state in order to read the data from the memory cell MC 11 ( 0 ), remains nonselective, and the drain lines DS 4  and DS 6  are continuously selected. 
     Next, when the reading operation with respect to the memory cell MC 11 ( 0 ) is completed and the clock signal rises, the address latch is released, and the word lines and bit lines are decoded in the row decoder  2  and the column decoder  3  in accordance with the address that selects the memory cell MC 11 ( 1 ) and the address determination signal AJ. The word line WL 1  becomes nonselective, and the selecting transistor control line GR 2  becomes nonselective. As a result, the selecting transistors TR 20 , TR 22 , TR 24 , TR 11 , TR 13  and TR 15  are turned off, and the source line selecting lines SS 2 , SS 4  and SS 6  are selected. The voltages of the bit lines BL 2 , BL 4  and BL 6  are then reset to the ground voltage. 
     At the time, the selective state of the drain line selecting line DS 1  and the nonselective state of the source line selecting line SS 1  is maintained. After the address decoding with respect to the memory cell MC 11 ( 1 ) is completed in the row decoder  2  and the column decoder  3 , the data in the memory cell MC 11 ( 1 ) is read without waiting for completing the reset of the voltages of the bit lines BL 2 , BL 4  and BL 6 . The reading operation with respect to the memory cell MC 11 ( 1 ) is carried out based on a generation of the following state. Namely, the clock signal falls, the select address of the memory cell MC 11 ( 1 ) is latched in the address latch circuit  9 , a predetermined voltage is applied to the word line WL 1 , the source line selecting line SS 3  becomes nonselective, and the bit line selecting line YG 3  is selected. As a result, the sense amplifier  16  is connected to the bit line BL 3 . Further, the selecting transistor control line GL 2  is selected so that the selecting transistors TL 20 , TL 22 , TL 24 , TL 11 , TL 13  and TL 15  are selected. The data in the memory cell MC 11  is read after the aforementioned state is achieved. 
     At the time, the bit line BL 1  (drain line) is connected to the bit line BL 3  (source line) via the memory cell MC 11 . Therefore, the cell current in accordance with data stored in the memory cell MC 11  flows in the bit line BL 3 , and the voltage of the bit line BL 3  thereby changes. The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. The read data as the determination result is outputted from the data output terminal Dout. 
     Furthermore, the memory cells MC 10 , MC 11 , MC 12  and MC 13  are selected since the word line WL 1  is selected. However, the voltages of the bit lines BL 0 -BL 5  are not changed through the memory cells MC 10  and MC 12  because the selecting transistor control lines GL 1  and GR 1  are in the nonselective state. Further, the reset of the voltages of the bit lines BL 2 , BL 4  and BL 6  is completed while the data in the memory cell MC 11 ( 1 ) is being read, and the voltages of the bit lines BL 2 , BL 4  and BL 6  are set to the ground voltage. Further, the address that selects the memory cell MC 13 ( 0 ) is inputted while the data in the memory cell MC 11 ( 1 ) is being read. The select address of the memory cell MC 13 ( 0 ) is compared to the select address of the memory cell MC 11 ( 1 ) retained in the address latch circuit  9 . When the data in the memory cell MC 13 ( 0 ) is read, the bit line BL 3  (odd-numbered bit line) is used in the case where the selecting transistor TL 13  is selected. Because the used bit line BL 3  is consistent with the bit line BL 3  (odd-numbered bit line) used in the reading operation with respect to the memory cell MC 11 ( 1 ), the determination result by the address determination circuit  8 ′ shows the consistency. When the address determination signal AJ shows the consistency, the selecting transistor control line and the bit line selecting line are switched over, and the selecting transistor control line GR 2  and the bit line selecting line YG 4  are used in the reading operation with respect to the memory cell MC 13 ( 0 ). Then, the result of the reading operation is read from the bit line BL 4 . The non-latched address and address determination signal AJ are transmitted to the decoding circuit of the source line selecting lines SS 0 -SS 6  and the drain line selecting lines DS 0 -DS 6  in the column decoder  3 , and thereby the source line selecting line SS 6  becomes nonselective so that the drain line selecting line DS 6  is selected. As a result, the voltage of the bit line BL 6  is pre-charged to the drain voltage. At the time, the source line selecting line SS 3 , which is in the nonselective state in order to read the data from the memory cell MC 11 ( 1 ), remains nonselective, and the drain line selecting line DS 1  is continuously selected. 
     Next, when the reading operation with respect to the memory cell MC 11 ( 1 ) is completed and the clock signal rises, the address latch is released, the word lines and bit lines are decoded in the row decoder  2  and the column decoder  3  in accordance with the address that selects the memory cell MC 13 ( 0 ) and the address determination signal AJ. The word line WL 1  becomes nonselective, and the selecting transistor control line GL 2  becomes nonselective. As a result, the selecting transistors TL 20 , TL 22 , TL 24 , TL 11 , TL 13  and TL 15  are turned off, and the source line selecting lines SS 1 , SS 3  and SS 5  are selected. Then, the voltages of the bit lines BL 1 , BL 3  and BL 5  are reset to the ground voltage. At the time, the selective state of the drain line selecting line DS 6  and the nonselective state of the source line selecting line SS 6  are maintained. After the address decoding with respect to the memory cell MC 13 ( 0 ) is completed in the row decoder  2  and the column decoder  3 , the data in the memory cell MC 13 ( 0 ) is read without waiting for completing the rest of the voltages of the bit lines BL 1 , BL 3  and BL 5 . 
     When the data in the memory cell MC 13 ( 0 ) is read, the clock signal falls at first, the select address of the memory cell MC 13 ( 0 ) is latched in the address latch circuit  9 , and a predetermined voltage is applied to the word line WL 1 . Further, the source line selecting line SS 4  becomes nonselective, and the bit line selecting line YG 4  is selected. As a result, the sense amplifier  16  is connected to the bit line BL 4 . Further, the selecting transistor control line GR 2  is selected so that the selecting transistors TR 20 , TR 22 , TR 24 , TR 11 , TR 13  and TR 15  are selected. At the time, the bit line BL 6  (drain line) is connected to the bit line BL 4  (source line) via the memory cell MC 13 . Therefore, the cell current in accordance with data stored in the memory cell MC 13  flows in the bit line BL 4 , and the voltage of the bit line BL 4  thereby changes. The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. The read data as the determination result is outputted from the data output terminal Dout. 
     In the meantime, though the memory cells MC 10 , MC 11 , MC 12  and MC 13  are selected based on a selection of the word line WL 1 , the voltages of the bit lines BL 0 -BL 5  are not changed by the memory cells MC 10  and MC 12  because the selecting transistor control lines GL 1  and GR 1  are in the nonselective state. Further, the reset of the voltages of the bit lines BL 1 , BL 3  and BL 5  is completed while the data in the memory cell MC 13 ( 0 ) is being read, and the voltages of the bit lines BL 1 , BL 3  and BL 5  are set to the ground voltage. Further, the address that selects the memory cell MC 12 ( 1 ) is inputted while the data in the memory cell MC 13 ( 0 ) is being read. The select address of the memory cell MC 12 ( 1 ) is compared to the select address of the memory cell MC 13 ( 0 ) retained in the address latch circuit  9 . When the data in the memory cell MC 12 ( 1 ) is read, the bit line BL 5  (odd-numbered bit line) is used in the case where the selecting transistor TR 14  is selected. Because the used bit line BL 5  is inconsistent with the bit line BL 4  (even-numbered bit line) used in the reading operation with respect to the memory cell MC 13 ( 0 ), the determination result by the address determination circuit  8 ′ shows the inconsistency. When the address determination signal AJ shows the inconsistency, the selecting transistor control line and the bit line selecting line are not switched over, and the selecting transistor control line GR 1  and the bit line selecting line YG 5  are used in the reading operation with respect to the memory cell MC 12 ( 1 ). Then, the reading result is read from the bit line BL 5 . The non-latched address and address determination signal AJ are transmitted to the decoding circuit of the source line selecting lines SS 0 -SS 6  and the drain line selecting lines DS 0 -DS 6  in the column decoder  3 , and the source line selecting lines SS 1  and SS 3  become nonselective so that the drain line selecting lines DS 1  and DS 3  are selected. As a result, the voltages of the bit lines BL 1  and BL 3  are pre-charged to the drain voltage. At the time, the source line selecting line SS 4 , which is in the nonselective state in order to read the data from the memory cell MC 13 ( 0 ), remains nonselective, and the drain line selecting line DS 3  is continuously selected. 
     Next, when the reading operation with respect to the memory cell MC 13 ( 0 ) is completed and the clock signal rises, the address latch is released, the word lines and bit lines are decoded in the row decoder  2  and the column decoder  3  in accordance with the address that selects the memory cell MC 12 ( 1 ) and the address determination signal AJ. The word line WL 1  becomes nonselective, and the selecting transistor control line GR 2  becomes nonselective. As a result, the selecting transistors TR 20 , TR 22 , TR 24 , TR 11 , TR 13  and TR 15  are turned off, and the source line selecting lines SS 2 , SS 4  and SS 6  are selected. The voltages of the bit lines BL 2 , BL 4  and BL 6  are then reset to the ground voltage. 
     At the time, the selective state of the drain line selecting lines DS 1  and DS 3  and the nonselective state of the source line selecting lines SS 1  and SS 3  are maintained. After the address decoding with respect to the memory cell MC 12 ( 1 ) is completed in the row decoder  2  and the column decoder  3 , the data in the memory cell MC 12 ( 1 ) is read without waiting for completing the reset of the voltages of the bit lines BL 2 , BL 4  and BL 6 . 
     When the data in the memory cell MC 12 ( 1 ) is read, the clock signal falls at first, the select address of the memory cell MC 12 ( 1 ) is latched in the address latch circuit  9 , and a predetermined voltage is applied to the wordline WL 1 . Further, the source line selecting line SS 5  becomes nonselective, and the bit line selecting line YG 5  is selected. As a result, the sense amplifier  16  is connected to the bit line BL 5 . Further, the selecting transistor control line GR 1  is selected so that the selecting transistors TR 10 , TR 12 , TR 14 , TR 01 , TR 03  and TR 05  are selected. At the time, the bit line BL 3  (drain line) is connected to the bit line BL 5  (source line) via the memory cell MC 12 . Therefore, the cell current in accordance with data stored in the memory cell MC 12  flows in the bit line BL 5 , and the voltage of the bit line BL 5  thereby changes. The cell current or the voltage of the bit line is compared to the reference  17  in the sense amplifier  16  so that the data is decided to be “0” or “1”. The read data showing the determination result is outputted from the data output terminal Dout. 
     Meanwhile, the memory cells MC 10 , MC 11 , MC 12  and MC 13  are also selected based on selection of the word line WL 1 . However, the voltages of the bit lines BL 0 -BL 6  are not changed through the memory cells MC 11  and MC 13  because the selecting transistor control lines GL 2  and GR 2  are in the nonselective state. Further, the selecting transistors TR 10 , TR 12 , TR 14 , TR 01 , TR 03  and TR 05  are selected since the selecting transistor control line GR 1  is selected, and the bit line BL 2  is connected to the bit line BL 4  via the memory cell MC 10 . However, there is no current flow in the memory cell MC 10  because the drain voltage is applied to the bit lines BL 2  and BL 4 , and the reading operation with respect to the memory cell MC 12  is not thereby affected. Further, the reset of the voltages of the bit lines BL 1 , BL 3  and BL 5  is completed while the data in the memory cell MC 12 ( 1 ) is being read, and the voltages of the bit lines BL 1 , BL 3  and BL 5  are set to the ground voltage. 
     As described above, while the selecting transistor control lines GL and GR, the bit line selecting lines YG are switched over based on the determination signal of the address determination circuit  8 ′ and then switch over the bit lines used in the reading operation in order to carry out the reading operation of the memory cell, the voltage of the bit line of the next memory cell can be pre-charged. Further, the data can be read from the next memory cell while the voltage of the bit line after the reading operation with respect to the memory cell is being reset. As a result, the data can be randomly read at a high speed. 
     The preferred embodiment 6 shows the case where the Nch transistors constitute the selecting transistor  12 , bit line selecting transistor  13 , source line selecting transistor  14   c  and drain line selecting transistor shown in  FIG. 22 , however, the Pch transistors may constitute these transistors depending on the constitution of the memory cell  11 . Furthermore, as described above, the present preferred embodiment is not limited to the Nch non-volatile memory cell, and at least one of Pch non-volatile memory or resistance-variable non-volatile memory (RRAM), which are able to control only the selected word line, can be also applied. More specifically, the present preferred embodiment can be applied to a semiconductor memory device comprising memory cells capable of controlling only the selected word line. Such a semiconductor memory device can also realize the random reading operation at a high speed in a similar operation 
     Though the preferred embodiments of this invention are described in detail, it will be understood that various modifications may be made therein, and it is intended to cover in the appended claims all such modifications as fall within the true spirit and scope of this invention.