JP2007150543A - Mobile terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile terminal which tests a failure phenomenon that occurs in a built-in integrated circuit using a downloaded test program. <P>SOLUTION: The mobile terminal comprises: a key input 106 that accepts key input by a user; a download 107 for downloading a test program; a first memory device 104 for storing the test program, a second memory device 105 where a control program is stored; a central processing device 102 which communicates with a mobile terminal base station for testing an integrated circuit; a memory control unit 103 that specifies a reading region; and a reset part for outputting a reset signal to the central processing device. The central processing device 102 reads and executes the program upon accepting the reset signal from the second memory device or the first memory device specified as a reading region. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a portable terminal device, and more particularly, to a test of a built-in integrated circuit.

  When a failure occurs in a mobile terminal device such as a mobile phone or PHS (Personal Handy phone System), the cause of the failure is analyzed.

  The cause of the failure is analyzed by confirming the failure phenomenon that has occurred, whether it is a failure caused by an LSI (Large Scale Integration) integrated in the portable terminal device or a failure caused by a drop in the output voltage of the power supply. Guessed.

  In order to confirm these assumptions, the following tests are performed.

  If it is presumed that the cause of the failure is in the integrated circuit on which it is mounted, remove the integrated circuit that seems to be the cause of the failure from the portable terminal device and test it, or replace the non-defective product after the removed integrated circuit. The operation of the portable terminal device is tested by attaching the integrated circuit.

  Instead of removing the integrated circuit from the portable terminal device and performing the test as described above, a ROM (Read Only Memory) in which a control program for controlling the operation of the normal portable terminal device is stored is stored. There is a method in which the contents are rewritten to a test program for testing an integrated circuit and the test is performed using this test program.

  In this case, when performing a test, it is necessary to write the test program into the ROM, and when the test is completed, the control program for controlling the operation is written again into the ROM so that the contents stored in the ROM are restored.

  In order to avoid the trouble of performing such a test, a dedicated test ROM in which a test program is stored in advance is provided in the mobile terminal device separately from the ROM storing the control program for operating the mobile terminal device. There is a portable terminal device that tests a built-in integrated circuit using a test program stored in a ROM dedicated to the test.

  When the cause of the failure is estimated to be due to a drop in the output voltage of the power supply, the voltage of the power supply supplied to the built-in electrical component is changed and tested.

  As a method of testing integrated circuits and electrical components by changing the power supply voltage, a power supply control unit that performs control for changing the voltage, and a power supply unit that can control the output voltage and control the power supply control unit And a voltage margin test method for changing a power supply voltage of an information processing apparatus having a battery backup memory in which a test voltage value can be written from a power supply control unit and a battery for supplying a memory holding power to the battery backup memory (See Patent Document 1).

  In this information processing apparatus, the test voltage value written in the battery backup memory is read into the power supply control unit, and the power supply control unit changes the voltage of the power supply unit so as to be the read test voltage value. A voltage margin test is performed.

When a failure is reproduced in the information processing apparatus due to the change in the voltage of the power supply unit, it can be understood that the failure is caused by the change in the voltage.
JP 05-002502 A

  By performing a test on the removed integrated circuit and reproducing the failure, it is determined that the removed integrated circuit has failed, and the cause of the failure is found in the removed integrated circuit.

  On the other hand, after the integrated circuit is removed, a non-defective integrated circuit is attached to the portable terminal device, and a test is performed on the portable terminal device to confirm that the portable terminal device no longer fails. Thus, it can be seen that the integrated circuit that has failed is removed from the portable terminal device.

  However, a large number of integrated circuits and electrical components are mounted on the mobile terminal device, and many investigations until the faulty component causing the integrated circuit and electrical components to be removed and tested are identified. There was a problem that it took time and labor.

  Since the portable terminal device has a complicated structure in which a large number of electrical components are mounted in a narrow space, other components may be damaged when the integrated circuit and the electrical components are replaced, and the integrated circuit and There has been a problem that the circuit board on which the electrical component is mounted may be damaged.

  When a test is performed by writing a test program in a ROM in which a control program is stored, there is a problem in that it takes time to rewrite the control program in the ROM again to restore the stored contents of the ROM after the test is completed.

  When a dedicated ROM for storing the test program is provided separately, it is necessary to secure a space for mounting the dedicated ROM in the portable terminal device, which can reduce the size and weight of the portable terminal device. There was a problem of being a restriction.

  In the voltage margin test in which the power supply voltage supplied to the integrated circuit and electrical components is changed by the power supply unit, a backup memory is required to perform this test, and the space for installing this backup memory and a dedicated battery is required. There was a problem that it was necessary to provide.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a portable terminal device that can test a failure phenomenon occurring in a built-in integrated circuit using a downloaded test program.

To achieve the above object, a first aspect of the portable terminal device of the present invention is a portable terminal device including an integrated circuit that performs communication with the portable terminal device base station and performs signal processing for the communication. In
A key input unit that receives key input from a user of the mobile terminal device;
A download unit for downloading the test program from a predetermined external storage means when the input content to the key input unit is a content to start downloading a test program for testing the integrated circuit When,
A first storage device for storing the test program;
A second storage device storing a control program for performing communication with the mobile terminal device base station;
By reading and executing the control program from the second storage device, communication with the mobile terminal device base station is performed, and the test program is read from the first storage device and executed. A central processing unit for testing the integrated circuit;
Until the key input to the key input unit for starting the download of the test program is performed, the second storage device is designated as a reading area of the central processing unit, and the first storage device A memory control unit for designating the first storage device as a reading area of the central processing unit when a test program is stored;
A reset unit that outputs a reset signal to the central processing unit when the designation of the reading area of the central processing unit is changed by the memory control unit or when specified by the user of the portable terminal device; With
When receiving the reset signal, the central processing unit is a portable terminal device that reads and executes the program from the first or second storage device specified as the reading area by the memory control unit.

2nd invention is the portable terminal device as described in 1st invention,
The predetermined external storage means is a data server connected to the mobile terminal device base station.

3rd invention is the portable terminal device as described in 1st invention,
The predetermined external storage means is a personal computer or an external storage device that can be wired to the portable terminal device.

4th invention is the portable terminal device as described in 1st invention,
Supplying power to the integrated circuit;
A power supply control unit is further provided for changing the voltage of the power supplied to the integrated circuit in accordance with the control of the central processing unit.

  Conventionally, when a failure has occurred in a portable terminal device and the cause of this failure is assumed to be in the built-in integrated circuit, the built-in integrated circuit is removed from the portable terminal device and the integrated circuit is tested. .

  On the other hand, in the present invention, when a failure occurs in the mobile terminal device and it is necessary to test the built-in integrated circuit, a test program for downloading the integrated circuit is downloaded to a predetermined external storage means. To the mobile terminal device.

  The downloaded test program is not a read-only second storage device that normally stores a control program for the mobile terminal device, but data necessary for executing the control program. It is stored in the first storage device that temporarily stores it.

  As described above, storing the test program in the first storage device does not affect the storage of the control program already stored in the second storage device.

  The first storage device storing the test program is designated as a reading area of the central processing unit by the memory control unit after the test program is stored.

  When the second storage device is designated as the read area by the designation of the read area of the memory control unit, the control program can be read into the central processing unit, and the first storage device is used for testing. When the first storage device is stored and the first storage device is designated as the reading area, the test program can be read into the central processing unit.

  When a normal reset signal is input, the central processing unit goes to read the area designated as the reading area of the central processing unit, and starts and executes the read program.

  When the power is turned on, the test program is not stored in the first storage device, the first storage device is not designated as the reading area of the central processing unit, and the second storage device is designated as the reading area. The control program is read from the second storage device into the central processing unit, and is activated and executed.

  The reset signal is sent to the central processing unit from the normal use state of the portable terminal device after the downloading of the test program, the storage to the first storage device, and the designation of the reading area of the first storage device are completed. By being input, a test program is read into the central processing unit and activated / executed.

  When an integrated circuit test is performed by executing a test program, a test for changing a power supply voltage supplied to the integrated circuit is also performed.

  By performing a voltage margin test in which the power supply voltage supplied to the integrated circuit is changed, the voltage operation margin of the integrated circuit is confirmed, and the failure is also reproduced when the voltage of the power supply to the integrated circuit drops.

  When the test by the test program is completed, the second storage device is designated as a reading area by the memory control unit, and the reset signal is input to the central processing unit by the reset unit, whereby the central processing unit is reset.

  As a result of this reset, the normal control program is read and executed by the central processing unit, and returns to the state of communicating with the mobile terminal device base station.

  According to the present invention, it is possible to obtain a portable terminal device capable of testing a failure phenomenon that has occurred in a built-in integrated circuit using a downloaded test program.

  Embodiments for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram illustrating a configuration example of a mobile terminal device according to the present embodiment.

  Like the conventional mobile phone terminal, this mobile terminal device performs voice communication with another telephone by communicating with a mobile terminal device base station (not shown), and the mobile terminal via the mobile terminal device base station Data communication is performed with a mobile phone website connected to the device base station.

  As shown in the figure, the mobile terminal device includes a key input unit 106 that accepts key input from a user of the mobile terminal device, and the input content to the key input unit 106 is a test as a test program for testing an integrated circuit. When the content is to start downloading the program, the download unit 101 that downloads the test program from a predetermined external storage unit, the RAM 104 that is the first storage device that stores the downloaded test program, and the mobile terminal device base A key to the ROM 105 that is a second storage device that stores in advance a control program as a control program for performing control when communicating with a station, and a key to the key input unit 106 to start downloading a test program Until the input is made, the ROM 105 is stored in the initial state of the central processing unit 102. When the test program is stored in the RAM 104, the memory control unit 103 that designates the RAM 104 as an initial read area, and the mobile terminal base station by reading the control program from the ROM 105 and executing it The central processing unit 102 that tests the integrated circuit by reading and executing the test program from the RAM 104, and when the designation of the reading area of the central processing unit 102 is changed by the memory control unit 103 or the portable terminal device A reset unit 107 that outputs a reset signal to the central processing unit 102 when the user designates the central processing unit 102, a display unit 109 that displays the status of the portable terminal device, and the like. LCD control unit 108 for controlling display and portable terminal The test target blocks 111 and 112 such as an integrated circuit that performs signal processing to perform communication in order to perform communication, and the power supply voltage supplied to the test target blocks 111 and 112 are changed according to control of the central processing unit 102. The power supply control unit 110 is provided.

  The download unit 101 is connected to a central processing unit 102, the central processing unit 102 is connected to a reset unit 107, the reset unit 107 is connected to a key input unit 106, and the key input unit 106 is a memory control unit. 103, the memory control unit 103 is connected to the ROM 105, the RAM 104 is connected to the memory control unit 103, the memory control unit 103 is connected to the reset unit 107, and the key input unit 106 is It is connected to the central processing unit 102.

  The memory control unit 103 is connected to the central processing unit 102, the central processing unit 102 is connected to the power control unit 110, the power control unit 110 is connected to the test target block 112, and the test target block 112 is The central processing unit 102 is connected to the test target block 111, the test target block 111 is connected to the power supply control unit 110, and the central processing unit 102 is connected to the LCD control unit 108. The LCD control unit 108 is connected to the display unit 109.

  The central processing unit 102 is a device for arithmetic processing generally referred to as a CPU (Central Processing Unit), and the central processing unit 102 and each component in the portable terminal device are a bus. Connected through.

  The central processing unit 102 has a function of controlling each component part by connecting to each component part via the bus.

  The central processing unit 102 performs a test from the RAM 104 when the RAM 104 is designated as an initial reading area after the test program is stored in the RAM 104 and the central processing unit 102 is reset by inputting a reset signal from the reset unit 107. A program can be loaded and executed.

  When the central processing unit 102 finishes executing the test program, the ROM 105 is designated as the initial reading area by the memory control unit 103, and the central processing unit 102 is reset by the input of the reset signal from the reset unit 107, A control program can be read from the ROM 105 and executed.

  The ROM 105 is a read-only memory that stores various control programs to be executed by the central processing unit 102 and fixed data.

  The execution software such as a control program stored in the ROM 105 includes a download program for downloading a test program.

  The download program is read from the ROM 105 into the central processing unit 102, and the downloaded download program is executed by the central processing unit 102, whereby a test program for testing the test target blocks 111 and 112 is stored in the portable terminal. It can be downloaded to the mobile terminal device via the device base station.

  The test program downloaded by this download program is a test program for diagnosing the test target blocks 111 and 112 such as a built-in integrated circuit (hereinafter referred to as LSI), and performs a single function block test. A test program may be prepared for each of the test target blocks 111 and 112, or a comprehensive test program for collectively performing the test target blocks 111 and 112 may be prepared.

  This test program is a predetermined program on a mobile phone website in which several types of test programs are stored using a communication function such as i-mode (NTT DOCOMO: registered trademark). The data server as the external storage means may be accessed via the mobile terminal device base station and communicated with the data server as the predetermined external storage means so that the data can be downloaded to the mobile terminal device.

  The test program is stored in a predetermined external storage in which the portable terminal device and a plurality of test programs are stored using a USB (Universal Serial Bus) cable or an RS-232C (TIA / EIA-232-E standard) cable. A necessary test program may be downloaded from the connected personal computer via the download unit 101 by wire connection with a personal computer (not shown) as means.

  In addition, an external storage device (not shown) that is a predetermined external storage means for storing the test program is prepared, and the portable terminal device and the external storage device are connected by wire, and the connected external storage device is You may be able to download the required test program.

  In this case, the download unit 101 may have an interface function such as USB or RS-232C capable of transmitting / receiving data to / from a personal computer or an external storage device in addition to a high-frequency transmission / reception function for communicating with the mobile terminal device base station.

  The RAM 104 is a memory allocated for work, and has a function of temporarily storing data necessary for the central processing unit 102 to execute the control program.

  The memory control unit 103 has a function of a memory controller that controls a memory bus for the central processing unit 102 to access the ROM 105 and the RAM 104 to read / write the memory.

  Further, the memory control unit 103 has a function of performing memory mapping of the ROM 105 and the RAM 104 in accordance with the content input to the key input unit 106, and a necessary area is set to 0 by the memory mapping performed by this function. You can specify the address.

  This address 0 is normally stored in the memory of the central processing unit 102 when the power is supplied to the mobile terminal device or when the central processing unit 102 of the mobile terminal device is reset by the reset unit 107. This is the beginning address of the address of the initial reading area where the program and data are read first.

  That is, normally, when the central processing unit 102 starts up, the central processing unit 102 reads the program from the address 0 of the memory, and there is a key input to the key input unit to start downloading the test program. Until this is done, the access area from address 0 is normally assigned to the ROM 105 as specified by the memory control unit 103.

  When the central processing unit 102 reads the access area from address 0, the control program stored in the ROM 105 is read into the central processing unit 102.

  On the other hand, for example, depending on the memory mapping method in the memory control unit 103, the RAM 104 can be set as the control program area or the test program area by designating the area of the RAM 104 as address 0.

  When the test program is stored in the RAM 104 by designating the area of the RAM 104 to address 0, the test program is read from the RAM 104 to the central processing unit 102 by the output of the reset signal from the reset unit 107.

  As described above, the CPU 102 stores the execution software such as the control program in the ROM 105 by the memory control unit 103 specifying the address 0 in the RAM 104 area, and the central processing unit 102 stores the test program stored in the RAM 104 specified in the address 0. Can be read from the RAM 104 and executed.

  Further, after the execution of the test program is completed, the control program can be executed by re-designating the address 0 of the ROM 105 area by the memory control unit 103, and the control program which is the execution software in the ROM 105 after the completion of the conventional test. No need to rework.

  The display unit 109 includes an LCD (Liquid Crystal Display) module and the like, and has a display function for performing display in accordance with a signal input from the LCD control unit 108 to the display unit 109.

  The display contents of the display unit 109 include the operation state of the mobile terminal device and the call state, as well as instructions for downloading a test program for performing a test, display of the operation state, and the downloaded test program The test items and test results of the test to be performed.

  The LCD control unit 108 has a function of performing various controls for causing the display unit 109 to perform various displays. The LCD control unit 108 converts and processes a signal input to the LCD control unit 108 and inputs the signal to the display unit 109. A display corresponding to the converted and processed signal can be displayed on the display unit 109.

  The key input unit 106 has a function of performing key input for operating the portable terminal device. The key input unit 106 gives an instruction to download a test program by the key input from the key input unit 106, or displays the display unit. The test item displayed in 109 can be selected.

  This key input of the key input unit 106 means that the reset signal output from the reset unit 107 is input to the central processing unit 102 according to the designation from the user of the portable terminal device, or the central processing by the memory control unit 103. It may mean that the reading area designation of the device 102 is changed.

  When a specific key is input from the key input unit 106, the reset unit 107 assigns an area of address 0 to the RAM 104, and when reset is specified, the reset unit 107 performs central processing. This is a circuit having a function of inserting a reset signal into the device 102 and resetting the central processing unit 102.

  The reset unit 107 inserts a reset signal to the central processing unit 102 in response to the notification of the completion of the switching of the memory mapping output from the memory control unit 103 instead of inputting a specific key from the key input unit 106. The central processing unit 102 may be reset.

  The download unit 101 is a circuit in which the mobile terminal device has a function of performing transmission and reception with the mobile terminal device base station, and has a function of downloading a test program from a mobile phone website via the mobile terminal device base station. .

  The test target blocks 111 and 112 are configured by an electric circuit such as an integrated circuit, and have functions such as signal processing, data processing, and arithmetic processing for performing processing for performing communication with the central processing unit 102.

  The power control unit 110 has a function of supplying power to the test target blocks 111 and 112 and controlling the supplied power voltage.

  For this reason, when the test target blocks 111 and 112 are tested by the test program, the power supply voltage supplied to the test target blocks 111 and 112 can be changed by a command from the central processing unit 102.

  The change in the voltage of the power supply by the power supply control unit 110 is used to see the voltage margin in the operation of the test target blocks 111 and 112 when determining the failure or failure of the test target blocks 111 and 112 such as the built-in LSI. Do.

  Conventionally, such a test that changes the voltage of the power supply of the LSI is performed by removing the test target blocks 111 and 112 such as LSI one by one from a circuit board (not shown) of the portable terminal device. It was done by attaching it to a jig.

  This mobile terminal device is provided with the power control unit 110 and has a function of changing the voltage of the power supplied to the test target blocks 111 and 112, thereby mounting the test target blocks 111 and 112 on the circuit board of the mobile terminal device. The self-test can be performed by changing the power supply voltage from the normal level without removing it.

  The components such as the download unit 101, the central processing unit 102, the ROM 105, the RAM 104, the key input unit 106, the LCD control unit 108, and the display unit 109 use the components provided in the conventional portable terminal device as they are. Alternatively, these components may be used in the present embodiment by adopting the configurations and functions described above.

  Next, the operation of the portable terminal device according to the present embodiment will be described in detail with reference to FIGS.

  FIG. 2 is a flowchart showing the processing operation of the mobile terminal device of this embodiment.

  When the user of the portable terminal device wants to test the operation of the LSI incorporated in the portable terminal device, the user uses the key input unit 106 to instruct to start downloading the test program. Press a specific key.

  The user selects a test program to be downloaded by an input from the key input unit 106 in accordance with an instruction on the menu screen of the display unit 109 by this key input.

  In response to the user's selection of the test program, a test program necessary for the test is downloaded from the mobile terminal device base station via the download unit 101 (step 210).

  When the test program is downloaded to the portable terminal device in this way, the downloaded test program is stored in the RAM 104 memory via the memory control unit 103 in accordance with an instruction from the central processing unit 102 (step 220).

  Next, when the notification that the test program has been downloaded and the test program has been stored in the RAM 104 is displayed on the display unit 109, the user inputs the key input unit 106 specified by the instruction displayed on the display unit 109. Key input is performed using a specific key for switching the memory mapping.

  By this specific key input, the memory control unit 103 switches the memory mapping in the portable terminal device so that the address 0 which has been allocated to the ROM 105 area until then is newly allocated to the RAM 104 area (step 230).

  The memory control unit 103 that has completed the switching of the memory mapping notifies the reset unit 107 of the completion of the switching of the memory mapping, and the reset unit 107 that has received this notification inserts a reset signal into the central processing unit 102. Perform (step 235).

  The switching of the memory mapping performed in step 230 and the insertion of the reset signal performed in step 235 may instead be performed as follows.

  The central processing unit 102 notifies the memory control unit 103 that the download has been completed, and in accordance with this notification, the memory control unit 103 designates the RAM 104 as an initial reading area, and then reads from the memory control unit 103 to the reset unit 107. The reset unit 107 may reset the central processing unit 102 in response to the notification of the end of the area designation.

  When memory mapping is switched by the memory control unit 103, a state where a normal control program is being executed by the central processing unit 102 unless the central processing unit 102 is normally reset even after the memory mapping switching. Remains.

  By inserting a reset signal from the reset unit 107 to the central processing unit 102, the central processing unit 102 reads and executes a control program stored in the ROM 105 designated as address 0 until the memory mapping is switched in step 230. Instead, the test program newly stored in the RAM 104 designated as address 0 is read, and the read test program is started (step 240).

  The central processing unit 102 displays the test items of the test target blocks 111 and 112, which are built-in LSIs, on the display unit 109 via the LCD control unit 108 in accordance with the activated test program (step 250).

  The user selects a desired item from the test items of the test target blocks 111 and 112 displayed on the display unit 109 by key input of the key input unit 106 (step 255), and tests the test selected by the test item. This is performed for the target blocks 111 and 112.

  Alternatively, each test item may be automatically performed by executing the test program.

  The test item being executed is displayed on the display unit 109 as needed (step 260).

  The execution of this test is for confirming whether or not the operation of the test target blocks 111 and 112 is normal. Specifically, it is confirmed whether the arithmetic function of the test target blocks 111 and 112 is operating normally. This is a test for checking whether the signal processing function, data processing function, control function, etc. of the test target blocks 111, 112 are operating normally.

  This test may be the same test as the test used for shipping inspection of the test target blocks 111 and 112 such as LSI, for example.

  In executing these tests, the supply voltage of the power supplied to the test target blocks 111 and 112 is changed stepwise under the control of the power control unit 110 in accordance with the instructions of the test program (step 270).

  The test for changing the supply voltage of the power supply stepwise is performed in the state of this specific low voltage value because the supply voltage of a battery pack (not shown) attached to the portable terminal device drops to a low voltage. This means that an abnormal operation in which the test target blocks 111 and 112 indicate a failure is reproduced by this test.

  By performing this test, it is possible to easily find a speed failure of a transistor in the LSI, which is likely to be leaked by the shipment selection of a semiconductor manufacturer, even among LSI failures.

  In addition, the execution of the test for changing the power supply voltage means that the mobile terminal device may be in an abnormal state at a specific temperature, and the abnormal operation at the specific temperature is simulated and reproduced. .

  Next, the end of the voltage fluctuation test is determined (step 280).

  If it is determined that a series of voltage swing tests for changing the predetermined supply voltage stepwise is completed, the flow of “YES” below step 280 is followed.

  The central processing unit 102 displays the test result performed by the test program on the display unit 109 via the LCD control unit 108. (Step 290).

  From the test result displayed on the display unit 109, the user of the portable terminal device can know the quality of the test result.

  When the test result is displayed on the display unit 109 and there are items in which the test result is negative among the test items performed, the LCD control unit 108 is instructed by the instruction of the central processing unit 102 by the test program. The user may be notified that the mobile terminal device needs to be repaired by displaying on the display unit 109.

  Furthermore, if there is an item in which the test result is negative among the test items performed, the test result is notified to the repair service center of the mobile terminal device via the mobile terminal device base station, for example, The failure history of the terminal device may be recorded at the repair service center, or the repair service center that receives the notification may handle the repair.

  If it is determined that a series of voltage swing tests for changing the predetermined supply voltage in stages is not completed, the flow of “NO” on the right side of step 280 is followed, and the test program further performs step 260. The test is executed, the supply voltage to the test target blocks 111 and 112 in step 270 is changed, and the test is continued.

  In this way, after the test by the test program is completed and the test result is displayed, the user performs power-on to the mobile terminal device again by key input to the key input unit 106, so that the memory control unit The address 0 is reassigned to the RAM 104 via 103, and after this reassignment, the central processing unit 102 is reset via the reset unit 107 (step 300).

  If this reset is not performed, address 0 is reassigned to ROM 105 by memory control unit 103, but the test program stored in RAM 104 is started and executed from step 240 and the test is completed. is there.

  When the reset by the reset unit 107 is performed, the mobile terminal device returns to the initial setting when the power is turned on, and the data stored in the RAM 104 may be cleared.

  In the initial setting at power-on, the access area designated as address 0 is the ROM 105, and the execution software, which is a control program, is still stored in the ROM 105, so this control program is read out.

  When reset, the central processing unit 102 reads the control program stored in the ROM 105 and restarts the control program (step 310).

  By this restart, the portable terminal device that has been in the LSI test state returns to an operation state in which normal communication and communication are performed.

  The reset performed in step 300 and the restart of the control program performed in step 310 may instead be performed as follows.

  The central processing unit 102 notifies the memory control unit 103 that the test is completed, and the memory control unit 103 designates the ROM 105 as the initial reading area again in accordance with this notification, and then the memory control unit 103 sends the reset information to the reset unit 107. The reset unit 107 may reset the central processing unit 102 in response to the notification of the end of designation of the reading area so that the restart is automatically performed.

  In this way, when a failure occurs in the mobile terminal device by downloading the test program and testing the LSI, the failure is caused by the LSI in which the failure is installed, or a failure caused by the built-in software This is information for analyzing whether it is due to a user's operation error or a drop in the output voltage of the power source.

As described above, according to the present invention, the following excellent effects can be obtained.
(1) If the mobile terminal device has an abnormality in operation, a test program is downloaded and the built-in LSI is tested, so that the user has an abnormality in the operation of the mobile terminal device. It is possible to inform whether it is due to the LSI being present or a failure due to a drop in the output voltage of the power supply.
(2) This mobile terminal device downloads a test program and tests the built-in LSI, thereby eliminating the need to remove the conventional LSI and performing the test. This can be greatly shortened compared to the prior art.
(3) This mobile terminal device downloads a test program and tests the built-in LSI, thereby removing other components and components generated when removing and replacing the LSI during the conventional test. The circuit board on which the LSI is mounted or the LSI is not damaged.
(4) Also, the portable terminal device stores the test program in the ROM instead of the control program by using the downloaded test program in the RAM while using the control program stored in the ROM as it is. In order to restore the original state after the test is completed, there is no need to rewrite software such as a control program in the ROM again. After the test is completed, the mobile terminal device can be returned to a normal use state by restarting the mobile terminal device.
(5) Since this portable terminal device temporarily stores the downloaded test program in the RAM that is normally used and uses it for the test, it is not necessary to prepare a dedicated ROM for storing the test program. The terminal device can be easily reduced in size and weight.
(6) Since the power supply control unit is provided in the portable terminal device, it is possible to determine whether the operation of the LSI is good or bad due to a change in the voltage of the power supply by a test without removing the built-in LSI from the portable terminal device. it can. When the failure phenomenon is reproduced by the voltage change of the power supply control unit, it can be understood that the failure is caused by the voltage change. This portable terminal device does not require a battery backup memory and a dedicated memory holding power source for performing a conventional test.

It is a block diagram which shows the structural example of the portable terminal device of this embodiment. It is a flowchart which shows the processing operation of the portable terminal device of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Download part 102 Central processing unit 103 Memory control part 104 RAM (1st memory | storage device)
105 ROM (second storage device)
106 Key Input Unit 107 Reset Unit 108 LCD Control Unit 109 Display Unit 110 Power Supply Control Unit 111 Test Target Block 112 Test Target Block 210-310 Steps

Claims (4)

In a mobile terminal device having an integrated circuit that performs communication with a mobile terminal device base station and performs signal processing for the communication,
A key input unit that receives key input from a user of the mobile terminal device;
A download unit for downloading the test program from a predetermined external storage means when the input content to the key input unit is a content to start downloading a test program for testing the integrated circuit When,
A first storage device for storing the test program;
A second storage device storing a control program for performing communication with the mobile terminal device base station;
By reading and executing the control program from the second storage device, communication with the mobile terminal device base station is performed, and the test program is read from the first storage device and executed. A central processing unit for testing the integrated circuit;
Until the key input to the key input unit for starting the download of the test program is performed, the second storage device is designated as a reading area of the central processing unit, and the first storage device A memory control unit for designating the first storage device as a reading area of the central processing unit when a test program is stored;
A reset unit that outputs a reset signal to the central processing unit when the designation of the reading area of the central processing unit is changed by the memory control unit or when specified by the user of the portable terminal device; With
When the central processing unit receives the reset signal, the central processing unit reads the program from the first or second storage device specified as the reading area by the memory control unit and executes the program. Terminal device. The mobile terminal device according to claim 1,
The predetermined external storage means is a mobile terminal device that is a data server connected to the mobile terminal device base station. The mobile terminal device according to claim 1,
The predetermined external storage means is a personal computer or an external storage device that can be wired to the mobile terminal device. The mobile terminal device according to claim 1,
Supplying power to the integrated circuit;
The portable terminal device further provided with the power supply control part which changes the voltage of the power supply supplied to the said integrated circuit according to control of the said central processing unit.

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