Abstract:
A mobile communication terminal and a method for reducing power consumption for driving a hard disk drive (HDD) of a mobile communication terminal are provided when controlling an interface between a transition integrated circuit (TIC) that takes charge of the interface with the HDD built in the mobile communication terminal and the HDD. The terminal and method include producing an HDD access request signal, initializing the TIC by resetting the TIC through a power-on of the TIC, performing an access of the HDD by driving the HDD after the initialization of the TIC is completed, and turning off an operation power of the TIC after the access of the HDD is completed.

Description:
PRIORITY 
   This application claims the benefit under 35 U.S.C. 119(a) of a Korean Patent Application entitled “Method of Reducing Power Consumption of a Hard Disk Drive of a Mobile Communication Terminal”, filed in the Korean Industrial Property Office on Nov. 19, 2004 and assigned Serial No. 2004-95096, the entire contents of which are hereby incorporated by reference. 
   BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a method for controlling an interface between a Transition Integrated Circuit (TIC) that controls the interface with a hard disc drive (HDD) built in a mobile communication terminal and the HDD. More particularly, the present invention relates to a method for controlling an interface that can minimize the power consumption of the mobile communication terminal. 
   2. Description of the Related Art 
   Generally, a mobile communication terminal represents a device that wirelessly communicates with a base station, and primarily performs phone calls. In the present state, however, additional functions for processing multimedia information have gradually added to the mobile communication terminal in addition to the phone call function. For example, a camera may be attached to the mobile communication terminal to process image data and additional functions such as music files, electronic pocket books, and so on, may be performed in the mobile communication terminal. In order to process the multimedia functions as described above, in other words, in order to store media data such as music and image data, such as moving image and still image, the mobile communication terminal requires a large memory capacity. 
   To achieve this, the mobile communication terminal is provided with an auxiliary memory built in the terminal or provided outside the terminal. A semiconductor memory or a disk memory may be used as the auxiliary memory. The semiconductor memory may be a nonvolatile memory such as a flash memory and the disk memory may be an HDD, an Optical Disk Drive (ODD), and so on. The ODD may comprise a Write Once Read Many (WORM)-type CD-ROM, digital video disc (DVD), and so on. 
   Meanwhile, in the case of the mobile communication terminal having the HDD as the auxiliary memory (hereinafter referred to as a hard-disk mobile communication terminal), the terminal performs a data access process as needed in order to write/read the data into/out of the HDD. 
     FIG. 1  is a block diagram illustrating a construction required to write/read data into/out of an HDD in a mobile communication terminal. 
   A Transition Integrated Circuit (TIC)  120  comprises an interface that takes part in the data and address input/output (I/O) with respect to the HDD. The TIC  120  supports a true Integrated Drive Electronics (IDE) mode and performs the interface between a control unit  110  and the HDD  130 . Accordingly, the TIC  120  should always be in a wake state so that the HDD  130  in the true IDE mode can achieve a smooth interface with the control unit  110 . In other words, since a HDD access request clock may unexpectedly be produced, power should always be supplied to the TIC  120  by way of precaution against this. 
   The TIC  120  should always be in a wake state for the above-described reason, and it causes unnecessary power consumption to occur. That is, as illustrated in  FIG. 2 , since the power should always be supplied to the TIC in order to perform irregular HDD access, power  204  for operating the TIC should always be provided in addition to power  202  for driving the HDD. This is quite inefficient in consideration of the limited power capacity of a battery provided in a mobile communication terminal. If a stable power should continuously be supplied to the TIC for instantaneous access to the HDD, a continuous power consumption also occurs, resulting in a user being unable to use the mobile communication terminal for a sufficient time although the battery of the mobile communication terminal has been charged once. 
   SUMMARY OF THE INVENTION 
   Accordingly, the present invention has been designed to solve the above and other problems, and an object of the present invention is to provide an algorithm for minimizing the battery power that is consumed while the hard disk drive (HDD) of the mobile communication terminal is driven. Also, an aspect of the present invention is to achieve stable HDD access by securing a sufficient Transition Integrated Circuit (TIC) initialization time before the HDD is driven. 
   In order to accomplish the above and other objects, a mobile communication terminal and method are provided of reducing power consumption of a HDD of a mobile communication terminal in a method for controlling an interface between a TIC that takes charge of the interface with the HDD built in the mobile communication terminal and the HDD, according to an exemplary embodiment of the present invention. The method comprises the steps of producing an HDD access request signal, initializing the TIC by resetting the TIC through a power-on of the TIC, accessing the HDD by driving the HDD after the initialization of the TIC is completed, and turning off an operation power of the TIC after the access of the HDD is completed. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: 
       FIG. 1  is a block diagram illustrating a conventional construction required to perform a multimedia process function in a hard-disk mobile communication terminal; 
       FIG. 2  is a graph illustrating the power consumption of a conventional Transition Integrated Circuit (TIC) interface; 
       FIG. 3  is a block diagram illustrating the internal construction of a hard-disk mobile communication terminal according to an exemplary embodiment of the present invention; 
       FIG. 4  is a flowchart illustrating an interface process of the TIC according to an exemplary embodiment of the present invention; 
       FIG. 5  is a timing diagram illustrating a TIC on-off clock and an HDD access clock according to an exemplary embodiment of the present invention; and 
       FIG. 6  is a graph illustrating the power consumption of the TIC interface according to an exemplary embodiment of the present invention. 
   

   Throughout the drawings, like reference numerals will be understood to refer to like parts, components and structures. 
   DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
   Exemplary embodiments of the present invention will be described in greater detail hereinafter with reference to the accompanying drawings. A detailed description of known functions and configurations incorporated herein will be omitted for clarity and conciseness. Although a number of specific features such as detailed constituent elements are given in the following description of the present invention, they are presented for a better understanding of the present invention only. Also, it will be clear to those skilled in the art that such specific features can easily be changed or modified within the scope of the present invention. 
     FIG. 3  is a block diagram illustrating the internal construction of a hard-disk mobile communication terminal according to an exemplary embodiment of the present invention. 
   Referring to  FIG. 3 , the hard-disk mobile communication terminal according to an exemplary embodiment of the present invention comprises a main processing unit  300 , a multimedia processing unit  340 , a control unit  320  and a battery  322 . The main processing unit  300  performs call destination/origination and a call processing function so as to place a phone call that is the original function of the hard-disk mobile communication terminal, and the multimedia processing unit  340  processes media data stored in the HDD provided in the hard-disk mobile communication terminal and wireless media data received through a RF unit. 
   The main processing unit  300  comprises a RF unit  302 , a first memory  304 , a key input unit  306 , a display unit  308 , and an audio processing unit  310 . The RF unit  302  performs a wireless data communication of the hard-disk mobile communication terminal, and the first memory  304  stores an Operating System (OS) and operation programs, manager data and user data. The key input unit  306  provides a keypad for user interface, and the display unit  308  provides a display means such as LCD and so on that displays image data. The audio processing unit  310  processes related audio data. The main processing unit  300  performs a wireless call destination/origination that is the original function of the terminal through the respective function units. Since operations of the respective function units are well known in the art, the detailed explanation thereof will be omitted for clarity and conciseness. 
   Meanwhile, the multimedia processing unit  340  retrieves and processes the media data stored in the HDD that is an auxiliary memory. The media data may be image data that comprise moving image data according to moving image compression algorithms such as Audio Video Interleave (AVI), Moving Picture Experts Group (MPEG), and so on, and still image data according to still image compression algorithms such as Joint Photographic Experts Group (JPEG) and so on, and audio data according to audio data compression algorithms such as MPEG, audio layer 3 (MP3), WAV, and so on. For example, if a specified MP3 music file reproduction request is input from a user, the multimedia processing unit  340  retrieves and reproduces the corresponding MP3 music file stored in the HDD. Additionally, if a specified MPEG moving image file reproduction request is input from the user, the multimedia processing unit  340  retrieves and reproduces the corresponding MPEG moving image file stored in the HDD. To achieve this, the multimedia processing unit  340  comprises the HDD  346 , TIC  344  and a second memory  342 . 
   The second memory  342  represents a temporary buffer for temporarily storing media data such as image data, audio data, and so on, and may be implemented by (SDRAM) and so on. The media data to be reproduced is retrieved from the HDD  346  and then written in the second memory  342 , so that the media data can properly be reproduced without loss. Specifically, when accessing the media data written in the HDD  346 , the control unit  320  temporarily writes the media data from the HDD  346  in the temporary buffer in the second memory  342 . Here, the whole area of the second memory is not used as the temporary buffer, but a part of the second memory  342  having a predetermined size (for example, 32 or 64 megabytes (MB)) is used as the temporary buffer. 
   The HDD  346 , which represents a recording medium for writing the media data, refers to an auxiliary storage device that writes/reads data while rotating a circular aluminum substrate on which a magnetic substance is coated. The hard-disk mobile communication terminal can write/reproduce diverse media data of a large capacity in the range of several hundred megabytes (MB) to several tens of gigabytes (GB) by writing/reading the media data into/out of the HDD  346 . 
   The TIC  344  performs a memory interface function so as to support the data and address input/output (I/O) interface function of the control unit  320 . Specifically, the HDD  346  is an element that is supported only in the true Integrated Drive Electronics (IDE) mode, and the TIC  344  performs the interface between the control unit  320  and the HDD  346  by supporting the true IDE mode. 
   The term ‘IDE’ refers to the standard electronic interface that is used between a data bus of a mother board and the HDD. The HDD  346  supports the IDE interface, and the control unit  320  may be interfaced in an I/O mode, memory mode and true IDE mode. Accordingly, in the case in which the HDD  346  supports the IDE interface function and simultaneously the control unit  320  supports all the interface functions in the I/O mode, memory mode and true IDE mode, it is not required to use the TIC  344 . In this case, the control unit  320  can directly access the data from the HDD  346 . However, in the case in which the control unit  320  only supports the interface functions in the I/O mode and the memory mode but does not support the interface function in the true IDE mode, although the HDD  346  supports the IDE interface function, the control unit  320  cannot directly access the HDD  346 , and thus the TIC  344  is provided for the IDE interface between the control unit  320  and the HDD  346 . Accordingly, as described above, in the case in which the control unit  320  accesses the HDD  346  through the TIC  344 , the control unit  320  interfaces in the I/O mode or memory mode, and the TIC  344  performs the IDE interface with the HDD  346 . Thereafter, the TIC  344  converts the data interfaced with the HDD  346  in the true IDE mode into an interface type of the control unit  320  to transfer the data to the control unit  320 . 
   Referring again to  FIG. 3 , the media data processing under the control of the control unit  320  will now be explained. The key data input through the key input unit  306  is transmitted to the control unit  320 . Among the media data, the audio data is processed by the control unit  320 , and then decoded and reproduced through the audio processing unit  310 . The image data is displayed on the display unit  308  under the control of the control unit  320 . Generally, a JPEG coding method may be used for the still image data, and an MPEG coding method may be used for the moving image data. Accordingly, the control unit  320  is provided with a JPEG codec and an MPEG codec to process the image data. In the same manner, an MP3 coding method may generally be used for the audio data. In this case, an MP3 codec is provided to process the audio data. If the compression is made through another coding method except for the coding methods such as JPEG, MPEG, MP3, and so on, the control unit  320  may be provided with another necessary codec to process the corresponding media data. 
   In order to process the media data as described above, the control unit  320  attempts to perform an access by non-periodically transmitting an HDD access command, for example, a reading/writing command, to the HDD through the TIC  344 . To achieve this, the operation power should always be supplied to the TIC  344 , and this causes unnecessary power consumption. In order to solve this problem, an algorithm that turns on the power of the TIC  344  only when the HDD access command is received from the control unit  320  is proposed as shown in  FIG. 4 . 
     FIG. 4  is a flowchart illustrating a process of driving the TIC for the access of the HDD according to an exemplary embodiment of the present invention. 
   Referring to the flowchart of  FIG. 4  and a timing diagram of  FIG. 5 , if an HDD access request for reading the media data written in the HDD  346  or writing specified media data in the HDD is input, the control unit requests the TIC to access a specified address in the HDD at step  402 . 
   The TIC which has received the HDD access request performs an interface with the HDD. To achieve this, the TIC  344  first performs a TIC reset process at step  404 . That is, in order for the TIC to perform reading/writing of a signal with respect to a specified address in the HDD, address, media data (that is necessary in the case of writing), and so on, it first performs the TIC reset process at step  404 . The reset process is a process of changing the state of the TIC from a power-off state to a power-on state. In a standby state, the TIC is maintained in the power-off state, and if the HDD access request is input from the control unit at step  402 , the operation power of the TIC is turned on as illustrated in  FIG. 5 . 
   After the TIC reset at step  404 , the TIC performs an initialization process at step  406  without performing an interface with the HDD. The TIC initialization process, as illustrated in  FIG. 5 , requires a TIC initialization time  508  such as a TIC self-reset, TIC stabilization clock generation, TIC firmware booting, memory check, TIC hardware initialization, and so on. 
   During the time  508  for the initialization process, the TIC should not attempt to access the HDD. If the TIC attempts to read/write media data into/out of the HDD just after the power of the TIC is turned on, the TIC is not yet in a normal mode, and thus the media data and address transmitted from the control unit to the TIC cannot efficiently be recognized by the TIC. Specifically, if the TIC is reset at point  502  and the power of the TIC is turned on during time  504 , it performs the self-initialization process at step  406  for driving the TIC, and if the transmission of the media data and address of the HDD to the TIC is performed before the TIC initialization process is completed, the TIC cannot normally process the received media data and address. Accordingly, since an access error may occur if the access request is performed while the TIC is in the initialization mode at step  406  that is not the normal mode, a specified wait time  508  for the initialization after the TIC reset is required. 
   If it is assumed that about 50 milliseconds is required for the above-described initialization work, the TIC should attempt the interface with the HDD after the TIC initialization time of 50 ms elapses. To achieve this, the control unit determines whether the TIC initialization time elapses at step  408 . After the TIC initialization time elapses, the control unit transmits media data, address signal and reading/writing command signals to the TIC. The TIC which has received the above-described signals performs the reading/writing operation requested by the control unit by performing the interface with the HDD at step  410  (HDD drive time  510 ). 
   After the access work for the HDD is completed, the HDD and the TIC enter a low-power mode, which is performed by the TIC-off command. The TIC-off command is for the complete removal of the power of the HDD and the TIC, and refers to a command wait time  512 . During the wait time  512 , the HDD is stopped and its head is unloaded. The wait mode time should be considered so much that the system guarantees the interface performance. After the TIC is off at step  412  at point  506 , the HDD access process is terminated. 
   Consequently, by turning on the TIC in advance only at the moment the HDD is accessed as illustrated in the flowchart of  FIG. 4 , the power required by the TIC when the HDD is driven can be minimized. 
     FIG. 6  is a graph illustrating the power consumption of the TIC interface according to an exemplary embodiment of the present invention. 
   As illustrated in  FIG. 6 , in a period  602  in which no HDD access attempt is made, the HDD drive power and the TIC operation power are not consumed. If the HDD access attempt is made, the TIC is first initialized in a period  604  to cause a power consumption  608 , and then the HDD is driven in an HDD access period  606  to cause a power consumption  610  in order to drive the HDD. In comparing the power consumption graph of  FIG. 6  according to an exemplary embodiment of the present invention with that of  FIG. 2  according to the prior art, it can be recognized that the power consumption for accessing the HDD is reduced and thus the use time of the terminal battery is lengthened. 
   As described above, according to exemplary embodiments of the present invention, by turning on the TIC, which is usually in an off state, only when the HDD access attempt is made, the power consumption of the terminal battery can be minimized. Additionally, by securing the TIC initialization time, a stable HDD access can be performed without any access error. 
   While the present invention has been shown and described with reference to certain exemplary embodiments thereof such as a mobile communication terminal, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.