Abstract:
A reconfigurable processor equipped with reconfigurable circuits (RCs) comprises unit A for dividing data input to the processor, and outputting a part of pieces of divided data to a RC, unit B for selecting or binding at least one piece of divided data among divided data which is not outputted from the input data dividing unit and output data of the RC to output processed data to other RCs, at least one RS buffer for temporarily storing data input to unit B to match timings of output from the RC and output from the RS buffer, unit C for binding the output data of the RC, unit A, and unit B to output data from the processor, and at least one RO buffer for temporarily storing data input to unit C to match the timings of output from the RC, output from unit A, and output from unit B.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
   This application is a Continuation of U.S. application Ser. No. 11/589,961 filed on Oct. 31, 2006, and claims priority from U.S. application Ser. No. 11/589,961 filed on Oct. 31, 2006, which claims priority from Japanese Patent Application No. 2005-317872, filed on Nov. 1, 2005, the entire disclosure of which is incorporated herein by reference. 

   BACKGROUND OF THE INVENTION 
   This invention relates to a reconfigurable processor and a reconfigurable apparatus. 
   In recent years, a processor has been demanded to have not only performance of computing data being constantly input in real time at a high speed, but also high versatility to facilitate changing of an implemented logic. 
   For example, in a case of a processor used in a network security field, performance of computing communication data being constantly input in real time at a high speed, and versatility which enables frequent updating of an algorithm for detecting abnormalities of the communication data, or a pattern file have been required. 
   In a case of a processor used in a video processing field, performance of computing video data constantly input in real time at a high speed, and versatility of performing various processings for the video data by combining a plurality of operations such as encoding/decoding, down-conversion, copyright information addition, division, synthesis, and format conversion have been required. 
   However, the high versatility to facilitate changing of the implemented logic cannot be obtained by ASIC which includes a dedicated circuit. The high-speed computing processing performance of the real-time data cannot be obtained by a general-purpose processor. 
   As a processor to simultaneously realize the two performances, a processor called a reconfigurable processor (RP) has been developed and has been attracting attention. This processor is largely classified into three systems, that is, an AND-OR system, a look up table (LUT) system, and an ALU (Arithmetic Logical Unit) system. 
   The AND-OR system is a system which uses an AND-OR logic array as a logical element. According to this AND-OR system, high density of logics can be achieved because of small logical units (refer to U.S. Pat. No. 4,609,986). 
   The LUT system is a system which uses a LUT composed of a synchronous random access memory (SRAM) as a logical element. A high-level random logic is realized by prerecording a value of each input signal to the LUT (refer to U.S. Pat. No. 4,642,487). 
   The ALU system is a system which uses an ALU having functions of computing, retiming, and a memory predesignated as a logical element. It is called a dynamic reconfigurable processor (DRP). This computer system can change an implemented logic by one clock cycle, and has high versatility (refer to WO 02/095946). 
   The processor of the ALU system includes a reconfigurable circuit composed of a logical element having functions of computing, retiming, memory, and the like, and a bus for enabling free connection among the logical elements, and processes data through a pipeline system according to the connection among the logical elements. Further, an implemented logic of this reconfigurable circuit can be freely reconfigured by changing the connection among the logical elements. Accordingly, the processor of the computer system realizes high-speed processing performance and high versatility. 
   However, the processor of the ALU system performs data computing through the pipeline system, so when the implemented logic of the reconfigurable circuit is updated, data flowing through the circuit is destroyed, causing a problem of a loss of input data. 
   Thus, a system that changes the implemented logic of the reconfigurable circuit without losing the input data has been proposed. There have been proposed a system for changing two reconfigurable circuits, that is, currently used and spare reconfigurable circuits by a switch to realize the changing of the implemented logic without any data loss, a system for accumulating input data through an input buffer to change the implemented logic at a point when there is no more data left in the reconfigurable circuit, and the like (refer to “Studies on Uninterruptible Reconfiguration Method in Packet Transfer Processing” by Hidenori Kai and Hiroki Yamada, Society Conference of the Institute of Electronics, Information and Communication Engineers, B-6-150, September 2003). 
   SUMMARY OF THE INVENTION 
   However, problems as described below have been inevitable in the conventional DRP and the DRP for switching the currently used and spare circuits. 
   In a case of the processor for switching the two currently used and spare reconfigurable circuits through the switch to realize changing of the implemented logic without any data loss, a number of necessary reconfigurable circuits is doubled, causing high implementing costs. 
   In a case of the conventional DRP employing a system for accumulating the input data by the input buffer to change the implemented logic at a point when there is no more data left in the reconfigurable circuit, data inputting and computing processings are stopped while the input data are accumulated in the buffer, causing deterioration of data computing processing performance when the implemented logic is changed. 
   This invention has been made to solve the above-mentioned problems, and it is an object of this invention to provide a reconfigurable processor and a reconfigurable apparatus capable of realizing logic changing without any loss of input data and without any deterioration of the data computing processing performance. 
   The reconfigurable processor and apparatus of this invention are each configured as follows to realize the logic changing without any loss of input data and without any deterioration of the data computing processing performance. 
   According to an aspect of this invention, there is provided a reconfigurable processor/apparatus equipped with at least one reconfigurable computing means capable of implementing optional logics, including: an input data dividing unit for dividing data input to one of the processor and apparatus to generate and output a plurality of pieces of divided data; at least one retiming output buffer for temporarily storing data output from the reconfigurable computing means and the input data dividing unit to output the data by matched timing; an output data binding unit for binding the data read from the retiming output buffer by the matched timing to output the data to an outside of the processor; and means for changing a logic implemented in the reconfigurable computing means within a time period during which computing processing is not executed by the reconfigurable computing means. 
   Further, according to another aspect of this invention, there is provided a reconfigurable processor/apparatus, including: an input data dividing unit for dividing data to be input to generate a plurality of pieces of divided data, and outputting a part of the plurality of pieces of divided data to one of the reconfigurable computing means; a processed data selection unit for performing one of selecting and binding of at least one piece of data from data output from the input data dividing unit and the reconfigurable computing means to output processed data; at least one retiming selection buffer for temporarily storing data input to the processed data selection unit to output the data by matched timing; an output data binding unit for binding the output data of the reconfigurable computing means, the input data dividing unit, and the processed data selection unit to output the data to an outside of the processor; at least one retiming output buffer for temporarily storing data input to the output data binding unit to output the data by the matched timing; and means for freely interconnecting the reconfigurable computing means in one of series and parallel. 
   In addition, the reconfigurable processor/apparatus further includes a reconfiguring-of-logic judgment unit in a stage before the input data dividing unit, for permitting logic changing when a format length of the input data exceeds a predesignated value when compared and when there is no data input for a certain period of time. 
   Further, the reconfigurable processor/apparatus further includes at least one configuration control unit; at least one configuration buffer for each of the configuration control units; and means for permitting the configuration control unit to implement a logic designated by configuration information prestored in the configuration buffer in the reconfigurable computing means. 
   The reconfigurable processor or apparatus for enabling logic changing without any loss of input data and without any deterioration of data computing processing performance is realized, which is impossible with the conventional reconfigurable processor or apparatus. 
   According to this invention, the processor or the apparatus is realized by a system of distributing data only necessary for computing among the input data to the reconfigurable computing means, and a system of changing the implemented logic of the reconfigurable computing means by using non-computing time generated in the reconfigurable computing means when data unnecessary for the computing is being input. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a block diagram showing a reconfigurable processor equipped with n reconfigurable circuits according to a first embodiment of this invention. 
       FIG. 2  is a block diagram showing a reconfigurable apparatus equipped with n reconfigurable processors according to a second embodiment of this invention. 
       FIG. 3  is a block diagram showing an example of an ALU type reconfigurable circuit according to the first embodiment of this invention. 
       FIG. 4  is a block diagram showing an example of an AND-OR/LUT type reconfigurable circuit according to the first embodiment of this invention. 
       FIG. 5  is a block diagram showing an example of a multi-CPU type reconfigurable circuit according to the first embodiment of this invention. 
       FIG. 6  is a block diagram showing a reconfigurable processor equipped with two reconfigurable circuits according to a third embodiment of this invention. 
       FIG. 7  is a block diagram showing a reconfigurable apparatus equipped with two reconfigurable processors according to a fourth embodiment of this invention. 
       FIG. 8  is a block diagram showing the reconfigurable processor equipped with an illegal communication defense function according to the third embodiment of this invention. 
       FIG. 9  is a block diagram showing the reconfigurable apparatus equipped with an illegal communication defense function according to the fourth embodiment of this invention. 
       FIG. 10  is a block diagram showing an illegal communication defense apparatus equipped with a reconfigurable processor implemented unit for executing illegal communication defense processing according to a fifth embodiment of this invention. 
       FIG. 11  is a block diagram showing a communication apparatus equipped with a reconfigurable processor implemented unit for executing illegal communication defense processing and a packet transfer unit according to the fifth embodiment of this invention. 
       FIG. 12  is a block diagram showing the communication apparatus equipped with the reconfigurable processor implemented unit for executing the illegal communication defense processing, the packet transfer unit, and a switching unit according to the fifth embodiment of this invention. 
       FIG. 13  is a block diagram showing the communication apparatus equipped with the reconfigurable processor implemented unit for executing the illegal communication defense processing for each of the packet transfer units, and the switching unit according to the fifth embodiment of this invention. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   First Embodiment 
   Referring to  FIGS. 1 and 3  to  5 , an operation of a first embodiment of this invention will be described in detail. 
     FIG. 1  is a block diagram showing a reconfigurable processor  100  of this invention. The reconfigurable processor  100  includes a reconfiguring-of-logic judgment unit  139  for comparing a format length of input data  138  with a predesignated value, or data non-input time with a predesignated value, an input data dividing unit  110  for dividing data  140  identical to the input data  138  to output the divided data, a reconfigurable circuit  130 -i (i=1 to n) in which an optional logic can be implemented, a processed data selection unit  111 -i (i=2 to n) for selecting and synthesizing a plurality of pieces of data being processed to output new data, retiming selection buffers  190 -i−j (i=1 to n−1, j=1 to n) and  191 -i (i=1 to n−1) for providing predesignated delays to divided data  141 - 1 −i (i=1 to n) output from the input data dividing unit  110 , selected data  141 -i−j (i=2 to n, j=1 to n) output from the processed data selection unit  111 -i, or computing result data  144 -i (i=1 to n−1) output from the reconfigurable circuit  130 -i to output the data to the processed data selection unit  111 -i, an output data binding unit  112  for synthesizing the processed data to output final data  151  to the outside of the processor, retiming output buffers  123 -i (i=1 to n),  122 , and  124  for outputting divided data  152  output from the input data dividing unit  110 , selected data  141 -n−j (=1 to n) output from the processed data selection unit n  111 -n, or computing result data  144 -n output from the reconfigurable circuit  130 -n to the output data binding unit by matched timing, a configuration control unit  113 -i (i=1 to n) for rewriting an implemented logic of each reconfigurable circuit  130 -i, and a configuration buffer  121 -i−k (i=1 to n, k=1 to m) for storing configuration information designating an implemented logic. 
     FIGS. 3 to 5  are exemplary block diagrams of the reconfigurable circuits.  FIG. 3  shows an example of a ALU type reconfigurable circuit  300 ,  FIG. 4  shows an example of an AND-OR/LUT type reconfigurable circuit  400 , and  FIG. 5  shows an example of a multi-CPU type reconfigurable circuit  500 . 
   Next,  FIGS. 1 and 3  to  5  will be described in detail. 
   The reconfigurable processor  100  of  FIG. 1  receives the data  138  continuously flowing in from the outside of the processor to execute various processing operations therein, and outputs a processing result as final data  151  to the outside of the processor. 
   The reconfiguring-of-logic judgment unit  139  receives the data  138  input by a certain format from the outside of the processor to judge whether a format length is larger than a predesignated value. When the format length is larger, the reconfiguring-of-logic judgment unit  139  transmits a command  179  for permitting changing of an implemented logic of the reconfigurable circuit. Alternatively, the reconfiguring-of-logic judgment unit  139  transmits the command  179  for permitting changing of the implemented logic of the reconfigurable circuit when data non-input time exceeds a predetermined period of time. The input data  138  is output as data  140  after a predesignated delay is generated. 
   The input data dividing unit  110  divides the input data  140 . There are three types of divided data, i.e., divided data  142 - 1  output to the reconfigurable circuit i  130 - 1 , divided data  141 - 1 −i (i=1 to n) output to the processed data selection unit  111 - 2 , and divided data  152  output to the output data binding unit  112 . Dividing timing is designated by a preset bit pattern, and a dividing range is set within a preset bit range and a preset clock range. For example, when real-time data  140  is input to the reconfigurable processor  100  by 35 bits per clock, dividing timing is designated to be a 7-th clock from when a bit pattern of higher order of 33 to 35 bits of the input data becomes “101”, and a dividing range is designated to be 3 clocks of lower order of 1 to 32 bits of the input data. 
   The reconfigurable circuit i  130 -i (i=1 to n) processes data  142 -i (i=1 to n) input from the outside of the circuit according to a pre-implemented logic, and outputs a processing result as computing result data  144 -i (i=1 to n) to the outside of the circuit. As shown in  FIGS. 3 to 5 , the inside of the circuit has a structure in which a plurality of functional blocks are interconnected through a plurality of buses. 
   The ALU type reconfigurable circuit  300  of  FIG. 3  includes ALU type functional blocks. Each functional block has a relatively large bit input/output such as 8, 16, or 32 bits, and includes EXE blocks  311  to  315  for performing predesignated arithmetic operations, CNT blocks  321  to  325  each having a counter function, RAM blocks  331  to  335  for performing data storage, DLE blocks  341  to  345  for delaying input data by designated clocks to output the data, IOB blocks  351  to  355  for inputting/outputting data with respect to the outside of the circuit, and the like. Outputs and inputs of the functional blocks can be freely connected by cross bar type switches  361  to  365  and  371  to  375 . 
   The AND-OR/LUT type reconfigurable circuit  400  of  FIG. 4  includes AND-OR/LUT type functional blocks. Each functional block has a relatively small bit input/output such as 1, 2, or 4 bits, and includes CLB blocks  411  to  415 ,  421  to  425 ,  431  to  435 , and  441  to  445  for outputting predesignated bit patterns according to input bit patterns,  10 B blocks  451  to  455  for inputting/outputting data with respect to the outside of the circuit, and the like. Outputs and inputs of the functional blocks can be freely connected through cross bar type switches  461  to  465  and  471  to  475 . 
   The multi-CPU type reconfigurable circuit  500  of  FIG. 5  includes CPU type functional blocks. Each functional block has a relatively large bit input/output such as 8, 16, or 32 bits, and includes CPU blocks  511  to  515 ,  521  to  525 , and  531  to  535  for performing various arithmetic operations according to predesignated commands, RAM blocks  531  to  535  for storing data, IOB blocks  551  to  555  for inputting/outputting data with respect to the outside of the circuit, and the like. Outputs and inputs of the functional blocks can be freely connected through cross bar type switches  561  to  565  and  571  to  575 . 
   The processed data selection unit i  111 -i (i=2 to n) selects one or more pieces of preset data from a plurality of pieces of data  154 -i−j (i=1 to n−1, j=1 to n),  155 -i (i=1 to n−1) read from the retiming selection buffers by matched timing, and binds a preset bit range and a preset clock range of the plurality of pieces of selected data in the timing of a preset bit pattern to output the selected data to the outside of the processor. There are two types of selected data to be output, i.e., selected data  142 -i (i=2 to n) output to the reconfigurable circuit i  130 -i (i=1 to n), and selected data  141 -i−j (i=2 to n, j=1 to n) output to the others. The input data  155 -i is directly output as selected data  141 −(i+1)-i. 
   The retiming selection buffer  190 -i−j (i=1 to n−1, j=1 to n) stores the divided data  141 -i−j (1=1 to n) from the input data dividing unit  110  or the selected data  141 -i−j (i=2 to n−1, j=1 to n) from the processed data selection unit i  111 -i (i=2 to n−1). The retiming selection buffer  191 -i (i=1 to n−1) stores the computing result data  144 -i (i=1 to n−1) from the reconfigurable circuit i  130 -i (i=1 to n−1). The stored data are read after timings are matched by the processed data selection unit i  111 -i (i=2 to n). 
   The output data binding unit  112  selects one or more pieces of preset data from the plurality of pieces of data  153 ,  145 -i (i=1 to n), and  150  read from the retiming output buffer by the matched timing, and binds a preset bit range and a preset clock range of the plurality of pieces of selected data by the timing of a preset bit pattern to output final data  151  to the outside of the processor. 
   The retiming output buffer  122  stores the divided data  152  from the input data dividing unit  110 . The output buffer  124  stores computing result data  144 -n from the reconfigurable circuit n  130 -n. The retiming output buffer  123 -i (i=1 to n) stores the selected data  141 -n−j (=1 to n) from the processed data selection unit n  111 -n. The stored data are read after timings are matched by the output data binding unit  112 . 
   Upon reception of a configuration change command  181 -i (i=1 to n) containing a reconfigurable circuit number and a configuration information number from the communication unit  101  outside the processor, the configuration control unit  113 -i (i=1 to n) reads configuration information  161 -i−j (i=1 to n, j=1 to m) matched with the configuration information number in the configuration change command  181 -i (i=1 to n) from the configuration buffer  121 -i−j (i=1 to n, j=1 to m) disposed in each configuration control unit  113 -i, and sends a rewrite command  162 -i−j (i=1 to n, j=1 to m) of an implemented logic designated by configuration information  161 -i−j to the reconfigurable circuit i  130 -i (i=1 to n) matched with the reconfigurable circuit number. The reconfigurable circuit i  130 -i rewrites the implemented logic according to the rewrite command  162 -i−j. 
   The configuration change command  181 -i (i=1 to n) may contain the number of writable clocks. In this case, the configuration control unit  113 -i (i=1 to n) outputs the rewrite command  162 -i−j of the implemented logic after a passage of the number of writable clocks after reception of the command  179  to permit changing of the implemented logic of the reconfiguring-of-logic judgment unit  139 . 
   The reconfigurable processor  100  sets information  180  on dividing timing and a dividing range received from the communication unit  101  outside the processor in the input data dividing unit  110 , sets information  184  on selected data, binding timing, and a binding range received from the communication unit  101  outside the processor in the output data binding unit  112 , sets information  182 -i (i=2 to n) on selected data, binding timing, and a binding range received from the communication unit  101  outside the processor in the processed data selection unit  111 -i (i=2 to n), and sets information  179  on designated format length and data non-input continuance time received from the communication unit  101  outside the processor in the reconfiguring-of-logic judgment unit  139 . 
   The reconfigurable processor  100  stores the configuration information  160 -i (i=1 to n) received from the communication unit  101  outside the processor in the configuration buffer  121 -i−j. 
   In the memory  132 -i (i=1 to n) incorporated in the reconfigurable circuit i  130 -i of the reconfigurable processor  100 , direct reading/writing is executed with respect to the communication unit  101  outside the processor. During reading, a read command  186 -i (i=1 to n) containing an address number is transmitted from the communication unit  101  to the memory, and read data  186 -i is returned from the memory  132 -i. During writing, a write command  186 -i containing an address number and write data is transmitted from the communication unit  101  to the memory. 
   Information transfer between the communication unit  101  and the reconfigurable processor  100  is carried out according to a command  185  from the terminal  102  to the communication unit  101 . 
   The reconfigurable processor  100  includes the reconfigurable circuits i  130 -i (i=1 to n), the input data dividing unit  110 , the retiming output buffers  123 -i,  122 , and  124 , and the output data binding unit  112 . Accordingly, by distributing only the data necessary for computing among the input data to the reconfigurable circuit while not distributing the data when data unnecessary for computing is being input, the means for changing the implemented logic of the reconfigurable circuit is realized by using the non-computing time generated in the reconfigurable circuit. Hence, it is possible to realize the reconfigurable processor for enabling logic changing without any loss of input data and without any deterioration of data computing processing performance, which is impossible with the conventional reconfigurable processor or apparatus. 
   The reconfigurable processor  100  includes the processed data selection unit i  111 -i and the retiming selection buffers  190 -i−j and  191 -i. Hence, the plurality of reconfigurable circuits can be connected in series or in parallel. 
   The reconfigurable processor  100  includes the configuration control unit  113 -i (i=1 to n) as described above and the configuration buffer  121 -i−j (i=to n, j=1 to m). Hence, it is possible to implement a logic designated by configuration information prestored in the configuration buffer in each configurable circuit. 
   Further, the reconfigurable processor  100  includes the memory  132 -i (i=1 to n) described above. Hence, it is possible to directly read/write data with respect to the memory within the processor from the outside of the processor. 
   Second Embodiment 
   Referring to  FIG. 2 , an operation of this invention will be described in detail. 
     FIG. 2  is a block diagram showing a reconfigurable apparatus  200  of this invention. The reconfigurable apparatus  200  includes a reconfiguring-of-logic judgment unit  239  for comparing a format length of input data  238  with a predesignated value or data non-input time with a predesignated value, an input data dividing unit  210  for dividing data  240  identical to the input data  238  to output the divided data, a reconfigurable processor  230 -i (i=1 to n) in which an optional logic can be implemented, a processed data selection unit  211 -i (i=2 to n) for selecting and synthesizing a plurality of pieces of data being processed to output new data, retiming selection buffers  290 -i−j (i=1 to n−1, j=1 to n) and  291 -i (i=1 to n−1) for providing predesignated delays to divided data  241 - 1 −i (i=1 to n) output from the input data dividing unit  210 , selected data  241 -i−j (i=2 to n, j=1 to n) output from the processed data selection unit  211 -i, or computing result data  244 -i (i=1 to n−1) output from the reconfigurable processor  230 -i to output the data to the processed data selection unit  211 -i, an output data binding unit  212  for synthesizing the processed data to output final data  251  to the outside of the apparatus, retiming output buffers  223 -i (i=1 to n),  222 , and  224  for outputting divided data  252  output from the input data dividing unit  210 , selected data  241 -n−j (=1 to n) output from the processed data selection unit n  211 -n, or computing result data  244 -n output from the reconfigurable processor  230 -n to the output data binding unit by matched timing, a configuration control unit  213 -i (i=1 to n) for rewriting an implemented logic of each reconfigurable processor  230 -i, and a configuration buffer  221 -i−k (i=1 to n, k=1 to m) for storing configuration information designating an implemented logic. 
   Next,  FIG. 2  will be described in detail. 
   The reconfigurable apparatus  200  of  FIG. 2  receives the data  238  continuously flowing in from the outside of the apparatus to execute various processing operations therein, and outputs a processing result as final data  251  to the outside of the apparatus. 
   The reconfiguring-of-logic judgment unit  239  receives the data  238  input by a certain format from the outside of the apparatus to judge whether a format length is larger than a predesignated value. When the format length is larger, the reconfiguring-of-logic judgment unit  239  transmits a command  279  for permitting changing of an implemented logic of the reconfigurable processor. Alternatively, the reconfiguring-of-logic judgment unit  239  transmits the command  279  for permitting changing of the implemented logic of the reconfigurable circuit when data non-input time exceeds a predetermined period of time. The input data  238  is output as data  240  after a predesignated delay is generated. 
   The input data dividing unit  210  divides the input data  240 . There are three types of divided data, i.e., divided data  242 - 1  output to the reconfigurable processor  1   230 - 1 , divided data  241 - 1 −i (i=1 to n) output to the processed data selection unit  211 - 2 , and divided data  252  output to the output data binding unit  212 . Dividing timing is designated by a preset bit pattern, and a dividing range is set within a preset bit range and a preset clock range. For example, when real-time data  240  is input to the reconfigurable apparatus  200  by 35 bits per clock, dividing timing is designated to be a 7-th clock from when a bit pattern of higher order of 33 to 35 bits of the input data becomes “101”, and a dividing range is designated to be 3 clocks of lower order of 1 to 32 bits of the input data. 
   The reconfigurable processor i  230 -i (i=1 to n) processes data  242 -i (i=1 to n) input from the outside of the processor according to a pre-implemented logic, and outputs a processing result as computing result data  244 -i (i=1 to n) to the outside of the processor. 
   The processed data selection unit i  211 -i (i=2 to n) selects one or more pieces of preset data from a plurality of pieces of data  254 -i−j (i=1 to n−1, j=1 to n) and  255 -i (i=1 to n−1) read from the retiming selection buffers by matched timing, and binds a preset bit range and a preset clock range of the plurality of pieces of selected data by timing of a preset bit pattern to output the selected data to the outside of the apparatus. There are two types of selected data to be output, i.e., selected data  242 -i (i=2 to n) output to the reconfigurable processor i  230 -i (i=2 to n), and selected data  241 -i−j (i=2 to n, j=1 to n) output to the others. The input data  255 -i is directly output as selected data  241 -(i+1)−i. 
   The retiming selection buffer  290 -i−j (i=1 to n−1, j=1 to n) stores the divided data  24 - 1 −j (=1 to n) from the input data dividing unit  210  or the selected data  241 -i−j (i=2 to n−1, j=1 to n) from the processed data selection unit i  211 -i (i=2 to n−1). The retiming selection buffer  291 -i (i=1 to n−1) stores the computing result data  244 -i (i=1 to n−1) from the reconfigurable processor i  230 -i (i=1 to n−1). The stored data are read after timings are matched by the processed data selection unit i  211 -i (i=2 to n). 
   The output data binding unit  212  selects one or more pieces of preset data from the plurality of pieces of data  253 ,  245 -i (i=1 to n), and  250  read from the retiming output buffer by the matched timing, and binds a preset bit range and a preset clock range of the plurality of pieces of selected data by the timing of a preset bit pattern to output final data  251  to the outside of the apparatus. 
   The retiming output buffer  222  stores the divided data  252  from the input data dividing unit  210 . The output buffer  224  stores computing result data  244 -n from the reconfigurable processor n  230 -n. The retiming output buffer  223 -i (i=1 to n) stores the selected data  241 -n−j (j=1 to n) from the processed data selection unit n  211 -n. The stored data are read after timings are matched by the output data binding unit  212 . 
   Upon reception of a configuration change command  281 -i (i=1 to n) containing a reconfigurable processor number and a configuration information number from a communication unit  201  outside the apparatus, the configuration control unit  213 -i (i=1 to n) reads configuration information  261 -i−j (i=1 to n, j=1 to m) matched with the configuration information number of the configuration change command  281 -i (i=1 to n) from the configuration buffer  221 -i−j (i=1 to n, j=1 to m) disposed in each configuration control unit  213 -i, and sends a rewrite command  262 -i−j (i=1 to n, j=1 to m) of an implemented logic designated by configuration information  261 -i−j to the reconfigurable processor i  230 -i (i=1 to n) matched with the reconfigurable processor number. The reconfigurable processor i  230 -i rewrites the implemented logic according to the rewrite command  262 -i−j. 
   The configuration change command  281 -i (i=1 to n) may contain the number of writable clocks. In this case, the configuration control unit  213 -i (i=1 to n) outputs the rewrite command  262 -i−j of the implemented logic after a passage of the number of writable clocks after reception of the command  279  to permit changing of the implemented logic of the reconfiguring-of-logic judgment unit  239 . 
   The reconfigurable apparatus  200  sets information  280  on dividing timing and a dividing range received from the communication unit  201  outside the apparatus in the input data dividing unit  210 , sets information  284  on selected data, binding timing, and a binding range received from the communication unit  201  outside the apparatus in the output data binding unit  212 , sets information  282 -i (i=2 to n) on selected data, binding timing, and a binding range received from the communication unit  201  outside the apparatus in the processed data selection unit  211 -i (i=2 to n), and sets information  279  on designated format length and data non-input continuance time received from the communication unit  201  outside the apparatus in the reconfiguring-of-logic judgment unit  239 . 
   The reconfigurable apparatus  200  stores the configuration information  260 -i (i=1 to n) received from the communication unit  201  outside the apparatus in the configuration buffer  221 -i−j. 
   In the memory  232 -i (i=1 to n) incorporated in the reconfigurable processor i  230 -i of the reconfigurable apparatus  200 , direct reading/writing is executed with respect to the communication unit  201  outside the apparatus. During reading, a read command  286 -i (i=1 to n) containing an address number is transmitted from the communication unit  201  to the memory, and read data  286 -i is returned from the memory  232 -i. During writing, a write command  286 -i containing an address number and write data is transmitted from the communication unit  201  to the memory. 
   Information transfer between the communication unit  201  and the reconfigurable apparatus  200  is carried out according to a command  285  from the terminal  202  to the communication unit  201 . 
   The reconfigurable apparatus  200  includes the reconfigurable processor i  230 -i (i=1 to n) described above, the input data dividing unit  210 , the retiming output buffers  223 -i,  222 , and  224 , and the output data binding unit  212 . Accordingly, by distributing only the data necessary for computing among the input data to the reconfigurable processor while not distributing the data when data unnecessary for computing is being input, the means for changing the implemented logic of the reconfigurable processor is realized by using the non-computing time generated in the reconfigurable processor. Hence, it is possible to realize the reconfigurable apparatus for enabling logic changing without any loss of input data and without any deterioration of data computing processing performance, which is impossible with the conventional reconfigurable processor or apparatus. 
   The reconfigurable apparatus  200  includes the processed data selection unit i  211 -i and the retiming selection buffers  290 -i−j and  291 -i. Hence, the plurality of reconfigurable processors can be connected in series or in parallel. 
   The reconfigurable apparatus  200  includes the configuration control unit  213 -i (i=1 to n) described above and the configuration buffer  221 -i−j (i=1 to n, j=1 to m). Hence, it is possible to implement a logic designated by configuration information prestored in the configuration buffer in each configurable processor. 
   Further, the reconfigurable apparatus  200  includes the memory  232 -i (i=1 to n). Hence, it is possible to directly read/write data with respect to the memory within the apparatus from the outside of the apparatus. 
   Third Embodiment 
   Referring to  FIGS. 6 and 8 , an operation of this invention will be described in detail. 
     FIG. 6  is a block diagram of a reconfigurable processor  600  when n=2 is set in the reconfigurable processor  100  of  FIG. 1 . A block indicated by reference numerals of  600 &#39;s of  FIG. 6  has the same function as that of a block indicated by reference numerals of  100 &#39;s of  FIG. 1 . 
     FIG. 8  is a block diagram when the reconfigurable processor  600  of  FIG. 6  is used as an illegal communication defense reconfigurable processor  800  in a network. An illegal communication judgment circuit  834  for judging an abnormality type for each packet is implemented in a first reconfigurable circuit  1   830 - 1 , and a communication statistics table  835  is implemented in an incorporated memory  832 - 1 . An illegal communication removal circuit  836  for judging passing/discarding of each packet based on a judging result of the abnormality type is implemented in a second reconfigurable circuit  2   830 - 2 . A session table  837  is implemented in an incorporated memory  832 - 2 . 
     FIGS. 6 and 8  will be described in detail below. 
   The reconfigurable processor  600  of  FIG. 6  divides input data  640  in an input data dividing unit  610 . When the input data dividing unit  610  is set to output divided data  642 - 1  to a reconfigurable circuit  1   630 - 1  and divided data  641 - 1 −i (i=1, 2) to a processed data selection unit  611 - 2 , and the processed data selection unit  611 - 2  is set to output input data  654 - 1 −i (i=1, 2) as selected data  642 - 2  and input data  655 - 1  as selected data  641 - 2 -i (i=1, 2), the two reconfigurable circuits are connected in parallel. On the other hand, when the input data dividing unit  610  is set to output only the divided data  642 - 1  to the reconfigurable circuit  1   630 - 1 , and the processed data selection unit  611 - 2  is set to output the input data  655 - 1  as selected data  642 - 2 , the two reconfigurable circuits are connected in series. 
   The illegal communication defense reconfigurable processor  800  of  FIG. 8  is a processor obtained by including an illegal communication defense function in the reconfigurable processor  600  of  FIG. 6 . The illegal communication defense function analyzes packets flowing through a communication network to detect and remove excessive load communications such as peer to peer (P2P) which causes communication faults, or various abnormal communications such as illegal communications executed to attack a personal computer (PC), a router, or a server, e.g., Worm, denial of service (DoS), or distributed denial of service (DDoS). A reconfiguring-of-logic judgment unit  839  judges a packet length as a format length when used for the network. A packet length of an IP header field in the received packet is read to be compared with a predesignated packet length. For example, presuming that a predesignated packet length is 1000 bytes, when a packet whose length is equal to or more than 1000 bytes arrives, a command  879  for changing an implemented logic of the reconfigurable processor is output. 
   Upon reception of packet data flowing through the network as data  840 , the input data dividing unit  810  outputs a part of the packet data as divided data  842 - 1  to the first reconfigurable circuit  1   830 - 1 . The input data dividing unit  810  also outputs a part of the packet data as divided data  841 - 1 - 1  to a processed data selection unit  811 - 2 , and all pieces of packet data as divided data  852  to an output data binding unit  812 . 
   For example, the divided data  842 - 1  output to the first reconfigurable circuit  1   830 - 1  contains information such as a transmission source IP address, a destination IP address, a transmission source port number, a destination port number, a TCP flag number, a protocol number, or a packet length described in an IP header or a TCP/UDP header inside a packet. The divided data  841 - 1 - 1  output to the processed data selection unit  811 - 2  contains information such as the transmission source IP address, the destination IP address, the transmission source port number, the destination port number, the TCP flag number, the protocol number, the packet length, a sequence number, or an ACK number described in the IP header or the TCP/UDP header inside the packet. 
   The illegal communication judgment circuit  834  implemented in the first reconfigurable circuit  1   830 - 1  analyzes a part of packet data output from the input data dividing unit  810 , and stores an analyzing result as communication statistics information in the communication statistics table  835  built in the memory  832 - 1 . The communication statistics information stored in the communication statistics table  835  contains a communication definition such as a transmission source IP address, a destination IP address, a transmission source port number, a destination port number, or a TCP flag number, a packet integrated number matched with the communication definition, and the like. 
   The illegal communication judgment circuit  834  judges whether a received packet is normal/abnormal based on the communication statistics information stored in the communication statistics table  835 . If the packet is judged to be abnormal, a type of the abnormality is judged. Results of judging normality/abnormality and an abnormality type are output as computing result data  844 - 1  to the processed data selection unit  811 - 2 . 
   The processed data selection unit  811 - 2  outputs a part of the received packet data and the judging results of normality/abnormality and the abnormality type as selected data  842 - 2  to the second reconfigurable circuit  2   830 - 2 . 
   The illegal communication removal circuit  836  implemented in the second reconfigurable circuit  2   830 - 2  analyzes a part of the packet data output from the processed data selection unit  811 - 2  according to the judging results of the normality/abnormality and the abnormality type output from the processed data selection unit  811 - 2 , and stores an analyzing result as session information in the session table  837  built in the memory  832 - 2 . The session information stored in the session table  837  contains a communication definition such as a transmission source IP address, a destination IP address, a transmission source port number, or a destination port number, a packet integrated number matched with the communication definition, presence/absence of a connection requested packet, presence/absence of a response requested packet, presence/absence of a response packet, and the like. 
   The illegal communication removal circuit  836  judges whether all pieces of the received packet data are to be passed/discarded based on the session information stored in the session table  837 . A passing/discarding judging result is output as computing result data  844 - 2 . 
   The output data binding unit  812  outputs all pieces of the packet data received from the input data dividing unit  810  only when the received computing result data  844 - 2  has a bit sequence expected when a judging result indicates that the packet data is to be passed. Accordingly, when it is judged that the packet data is to be discarded, outputting of the packet data is stopped. 
   The illegal communication defense reconfigurable processor  800  is realized by including the reconfigurable circuit  1   830 - 1  having the illegal communication judgment circuit  834  and the reconfigurable circuit  2   830 - 2  having the illegal communication removal circuit  836 . The illegal communication judgment circuit  834  implemented in the reconfigurable circuit  1   830 - 1  and the illegal communication removal circuit  836  implemented in the reconfigurable circuit  2   830 - 2  can minimize and separately receive data necessary for computing. Thus, for example, when time from a reception start of a 1500 byte-length packet to an end is 150 clocks, time from a reception start of data (20 bytes of 1500 bytes) needed by the illegal communication judgment circuit to an end is 2 clocks, and circuit passing time from inputting of data to outputting of a judging result is 100 clocks, non-computing time of 48 clocks is generated in the reconfigurable circuit  1 . By using such the non-computing time generated during long packet inputting to update an algorithm implemented in the reconfigurable circuit  1 , it is possible to realize uninterruptible algorithm updating without any throughput deterioration. 
   Fourth Embodiment 
   Referring to  FIGS. 7 and 9 , an operation of this invention will be described in detail. 
     FIG. 7  is a block diagram of a reconfigurable apparatus  700  when n=2 is set in the reconfigurable apparatus  200  of  FIG. 2 . A block indicated by reference numerals of  700 &#39;s of  FIG. 7  has the same function as that of a block indicated by reference numerals of 200&#39;s of  FIG. 2 . 
     FIG. 9  is a block diagram showing a case where the reconfigurable apparatus  700  of  FIG. 7  is used as an illegal communication defense reconfigurable apparatus  900 . An illegal communication judgment circuit  934  for judging an abnormality type for each packet is implemented in a first reconfigurable processor  1   930 - 1 , and a communication statistics table  935  is implemented in an incorporated memory  932 - 1 . An illegal communication removal circuit  936  for judging passing/discarding of each packet based on a judging result of the abnormality type is implemented in a second reconfigurable processor  2   930 - 2 . A session table  937  is implemented in an incorporated memory  932 - 2 . 
     FIGS. 7 and 9  will be described in detail below. 
   The reconfigurable apparatus  700  of  FIG. 7  divides input data  740  in an input data dividing unit  710 . When the input data dividing unit  710  is set to output divided data  742 - 1  to a reconfigurable processor  1   730 - 1  and divided data  741 - 1 −i (i=1, 2) to a processed data selection unit  711 - 2 , and the processed data selection unit  711 - 2  is set to output input data  754 - 1 −i(i=1, 2) as selected data  742 - 2  and input data  755 - 1  as selected data  741 - 2 -i(i=1, 2), the two reconfigurable processors are connected in parallel. On the other hand, when the input data dividing unit  710  is set to output only the divided data  742 - 1  to the reconfigurable processor  1   730 - 1 , and the processed data selection unit  711 - 2  is set to output the input data  755 - 1  as selected data  742 - 2 , the two reconfigurable processors are connected in series. 
   The illegal communication defense reconfigurable apparatus  900  of  FIG. 9  is an apparatus obtained by including an illegal communication defense function in the reconfigurable apparatus  700  of  FIG. 7 . 
   A reconfiguring-of-logic judgment unit  939  judges a packet length as a format length when used for a network. A packet length of an IP header field in the received packet is read to be compared with a predesignated packet length. For example, presuming that a predesignated packet length is 1000 bytes, when a packet whose length is equal to or more than 1000 bytes arrives, a command  979  for changing an implemented logic of the reconfigurable processor is output. 
   Upon reception of packet data flowing through the network as data  940 , the input data dividing unit  910  outputs a part of the packet data as divided data  942 - 1  to the first reconfigurable processor  1   930 - 1 . The input data dividing unit  910  also outputs a part of the packet data as divided data  941 - 1 - 1  to a processed data selection unit  911 - 2 , and all pieces of packet data as divided data  952  to an output data binding unit  912 . 
   The divided data  942 - 1  output to the first reconfigurable processor  1   930 - 1  contains, for example, information such as a transmission source IP address, a destination IP address, a transmission source port number, a destination port number, a TCP flag number, a protocol number, or a packet length described in an IP header or a TCP/UDP header inside a packet. The divided data  941 - 1 - 1  output to the processed data selection unit  911 - 2  contains information such as the transmission source IP address, the destination IP address, the transmission source port number, the destination port number, the TCP flag number, the protocol number, the packet length, a sequence number, or an ACK number described in the IP header or the TCP/UDP header inside the packet. 
   The illegal communication judgment circuit  934  implemented in the first reconfigurable processor  1   930 - 1  analyzes a part of packet data output from the input data dividing unit  910 , and stores an analyzing result as communication statistics information in a communication statistics table  935  built in the memory  932 - 1 . The communication statistics information stored in the communication statistics table  935  contains a communication definition such as a transmission source IP address, a destination IP address, a transmission source port number, a destination port number, or a TCP flag number, a packet integrated number matched with the communication definition, and the like. 
   The illegal communication judgment circuit  934  judges whether a received packet is normal/abnormal based on the communication statistics information stored in the communication statistics table  935 . If the packet is judged to be abnormal, a type of the abnormality is judged. Results of judging normality/abnormality and an abnormality type are output as computing result data  944 - 1  to the processed data selection unit  911 - 2 . 
   The processed data selection unit  911 - 2  outputs a part of the received packet data and the judging results of normality/abnormality and the abnormality type as selected data  942 - 2  to the second reconfigurable processor  2   930 - 2 . 
   The illegal communication removal circuit  936  implemented in the second reconfigurable processor  2   930 - 2  analyzes a part of the packet data output from the processed data selection unit  911 - 2  according to the judging results of the normality/abnormality and the abnormality type output from the processed data selection unit  911 - 2 , and stores an analyzing result as session information in a session table  937  built in the memory  932 - 2 . The session information stored in the session table  937  contains a communication definition such as a transmission source IP address, a destination IP address, a transmission source port number, or a destination port number, a packet integrated number matched with the communication definition, presence/absence of a connection requested packet, presence/absence of a response requested packet, presence/absence of a response packet, and the like. 
   The illegal communication removal circuit  936  judges whether all the pieces of received packet data are to be passed/discarded based on the session information stored in the session table  937 . A passing/discarding judging result is output as computing result data  944 - 2 . 
   The output data binding unit  912  outputs all pieces of the packet data received from the input data dividing unit  910  only when the received computing result data  944 - 2  has a bit sequence expected when a judging result indicates that the packet data is to be passed. Accordingly, when it is judged that the packet data is to be discarded, outputting of the packet data is stopped. 
   The illegal communication defense reconfigurable apparatus  900  is realized by including the reconfigurable processor  1   930 - 1  having the illegal communication judgment circuit  934  and the reconfigurable processor  2   930 - 2  having the illegal communication removal circuit  936  as described above. The illegal communication judgment circuit  934  implemented in the reconfigurable processor  1   930 - 1  and the illegal communication removal circuit  936  implemented in the reconfigurable processor  2   930 - 2  can minimize and separately receive data necessary for computing. Thus, for example, when time from a reception start of a 1500 byte-length packet to an end is 150 clocks, time from a reception start of data (20 bytes of 1500 bytes) needed by the illegal communication judgment circuit to an end is 2 clocks, and circuit passing time from inputting of data to outputting of a judging result is 100 clocks, non-computing time of 48 clocks is generated in the reconfigurable circuit  1 . By using such the non-computing time generated during long packet inputting to update an algorithm implemented in the reconfigurable circuit  1 , it is possible to realize uninterruptible algorithm updating without any throughput deterioration. 
   Fifth Embodiment 
     FIGS. 10 to 13  each show an example where a reconfigurable processor implemented unit including the illegal communication defense reconfigurable processor  800  or the illegal communication defense reconfigurable apparatus  900  of this invention is used for communication. 
     FIG. 10  is a block diagram showing an illegal communication defense apparatus  1000  which includes the illegal communication defense reconfigurable processor  800  or the illegal communication defense reconfigurable apparatus  900  in a reconfigurable processor implemented unit  1020 , and two communication data input/output units  1010  and  1011 . 
     FIG. 11  is a block diagram showing a communication apparatus  1100  which includes the illegal communication defense reconfigurable processor  800  or the illegal communication defense reconfigurable apparatus  900  in a reconfigurable processor implemented unit  1140 , an illegal communication defense unit  1120  including the reconfigurable processor implemented unit  1140 , a packet transfer unit  1130 , and a communication data input/output unit  1132 −k (k=1 to m). 
     FIG. 12  is a block diagram showing a communication apparatus  1200  which includes the illegal communication defense reconfigurable processor  800  or the illegal communication defense reconfigurable apparatus  900  in a reconfigurable processor implemented unit  1240 , an illegal communication defense unit  1220  including the reconfigurable processor implemented unit  1240 , a switching unit  1210 , a packet transfer unit  1230 -i (i=1 to n), and a communication data input/output unit  1232 -i−k (i=1 to n, k=1 to m). 
     FIG. 13  is a block diagram showing a communication apparatus  1300  which includes the illegal communication defense reconfigurable processor  800  or the illegal communication defense reconfigurable apparatus  900  in a reconfigurable processor implemented unit  1340 -i (i=1 to n), an illegal communication defense unit  1320 -i (i=1 to n) including the reconfigurable processor implemented unit  1340 -i, a switching unit  1310 , a packet transfer unit  1330 -i (i=1 to n), and a communication data input/output unit  1332 -i−k (i=1 to n, k=1 to m). 
     FIGS. 10 to 13  will be described below in detail. 
   The illegal communication defense apparatus  1000  of  FIG. 10  includes the two communication data input/output units  1010  and  1011 . Packet data input from each of the communication data input/output units  1010  and  1011  is subjected to illegal communication defense processing at the reconfigurable processor implemented unit  1020 , and the processed packet data is output from the other one of the communication data input/output units  1010  and  1011 . 
   The communication apparatus  1100  of  FIG. 11  includes one or more communication data input/output units  1132 −k (k=1 to m). Packet data input from each communication data input/output unit  1132 −k is subjected to illegal communication defense processing at the reconfigurable processor implemented unit  1140  in the illegal communication defense unit  1120 , and the processed packet data is output through a communication data internal input/output unit  1121 −k (k=1 to m) to the packet transfer unit  1130 . The packet transfer unit  1130  transmits the received packet data to the communication data internal input/output unit  1121 −k set according to a destination IP address, a destination MAC address, a destination MPLS label number, or a destination VLAN number of the received packet data. The illegal communication defense unit  1120  outputs the packet received via the communication data internal input/output unit  1121 −k to the communication data input/output unit  1132 −k. 
   The communication apparatus  1200  of  FIG. 12  includes a communication data input/output unit  1132 -i−k (i=1 to n, k=1 to m) for each packet transfer unit  1230 -i (i=1 to n). Packet data input from each communication data input/output unit  1232 -i−k to the packet transfer unit  1230 -i is output to the communication data input/output unit  1232 -i−k of the input destination packet transfer unit  1230 -i according to a destination IP address, a destination MAC address, a destination MPLS label number, or a destination VLAN number of the packet data, or output to the other packet transfer unit  1230 -i or the illegal communication defense unit  1220  via the communication data internal input/output unit  1231 -i (i=1 to n) and a switching unit  1210 . The packet data output to the illegal communication defense unit  1220  is subjected to illegal communication defense processing at the reconfigurable processor implemented unit  1240  in the illegal communication defense unit  1220 , and the processed packet data is output to the other packet transfer unit  1230 -i via the communication data internal input/output unit  1221  and the switching unit  1210  according to the destination IP address, the destination MAC address, the destination MPLS label number, or the destination VLAN number of the packet data. The packet transfer unit  1230 -i outputs the received packet data to the communication data input/output unit  1232 -i−k set according to the destination IP address, the destination MAC address, the destination MPLS label number, or the destination VLAN number of the packet data received from the switching unit  1210 . 
   The communication apparatus  1300  of  FIG. 13  includes a communication data input/output unit  1332 -i−k (i=1 to n, k=1 to m) for each illegal communication defense unit  1320 -i (i=1 to n). Packet data input from each communication data input/output unit  1332 -i−k is subjected to illegal communication defense processing at the reconfigurable processor implemented unit  1340 -i in the illegal communication defense unit  1320 -i. The processed packet data is output through the communication data internal input/output unit  1321 -i−k (i=1 to n, k=1 to m) to the packet transfer unit  1330 -i (i=1 to n). The packet data output to the packet transfer unit  1330 -i is output to the communication data internal input/output unit  1321 -i−k connected to the input destination packet transfer unit  1330 -i according to a destination IP address, a destination MAC address, a destination MPLS label number, or a destination VLAN number of the packet data, or output to the other packet transfer unit  1330 -i via the communication data internal input/output unit  1331 -i (i=1 to n) and a switching unit  1310 . The packet transfer unit  1330 -i transmits the received packet data to the communication data internal input/output unit  1321 -i−k set according to the destination IP address, the destination MAC address, the destination MPLS label number, or the destination VLAN number of the packet data received from the switching unit  1310 . The illegal communication defense unit  1320 -i outputs the packet data received via the communication data internal input/output unit  1321 -i−k to the communication data input/output unit  1332 -i−k. 
   While the present invention has been described in detail and pictorially in the accompanying drawings, the present invention is not limited to such detail but covers various obvious modifications and equivalent arrangements, which fall within the purview of the appended claims.