JP3014538B2 - IC card - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an IC card, and more particularly, to an IC card for efficiently performing a self-diagnosis process immediately after startup.

[0002]

2. Description of the Related Art An IC card has a built-in IC chip having a nonvolatile memory and a CPU, stores predetermined data in the memory, accesses the memory by a built-in control element, and communicates with an external device. Is used to exchange necessary data. The control element built in the IC card performs various controls by a control program stored in a built-in program memory.

Therefore, the IC card performs a self-diagnosis as to whether or not the card can operate normally immediately after the IC card is placed in a state where it can be accessed by an external device. As a result of the self-diagnosis, when it is determined that the card can operate normally, the IC card outputs an answer-to-reset (initial message). According to the ISO standard, this initial message is normally transmitted after the activation of the reset terminal of the IC card.
Output is required within 0 to 40000 clocks.

[0004]

However, the above-mentioned self-diagnosis of the card consists of checking the area of the RAM and checking the information registered in the system area. Recently, the self-diagnosis is performed in the RAM area and the system area. Information tends to increase. Therefore, if the answer-to-reset is output after checking all the contents, the answer-to-reset is not output within the above-mentioned time, and the standard cannot be satisfied.

An object of the present invention is to provide an IC card capable of outputting an initial message within a standard time even when the amount of registration information to be checked is large in a self-diagnosis at the time of activation of the IC card. And

[0006]

According to the present invention, there is provided a storage means for storing data, and the registration information registered in the storage means is checked at the time of startup to determine whether or not normal operation is possible. The IC card to be diagnosed includes a registration information check unit for checking whether the registered information registered in the storage unit can operate normally, and an initial message output unit for outputting an initial message based on a check result by the registration information check unit. A registration information capacity determination means for determining whether or not the capacity of registration information registered in the storage means is equal to or less than a predetermined amount; a registration information check means and an initial message output based on the determination by the registration information capacity determination means. Control means for controlling the means, the control means determines that the capacity of the registration information is equal to or less than a predetermined amount as a result of the determination by the registration information capacity determination means. In some cases, all of the registration information is checked by the registration information checking means, and then the initial message is output by the initial message output means. If the capacity of the registration information is not less than a predetermined amount, the registration information is checked. The initial message is output by the initial message output unit without performing at least a part of the registration information check by the unit.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an IC card according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows functional blocks of an embodiment of an IC card according to the present invention. As shown in FIG. 1, the IC card according to the present embodiment has a registration information storage unit 12 in which registration information to be checked in a self-diagnosis at the time of startup is stored, and a registration for checking information registered in the registration information storage unit 12. Information check unit 14, ATR output unit 16 that outputs an answer-to-reset, registered information capacity determination unit 1 that determines the capacity of registered information storage unit 12
4. It has a control unit 20 for controlling these units.
Components that are not directly related to the functions of the present invention are not shown.

[0008] The registration information storage unit 12 is a storage unit for storing registration information to be checked in self-diagnosis at the time of activation of the IC card, and corresponds to a RAM area and a system area.

The registration information check unit 14 is a functional unit that reads out the registration information stored in the registration information storage unit 12, checks its contents, and determines whether the card can operate normally. The ATR output unit 16 outputs an answer-to-reset (initial message) when it is determined by the registration information check unit 14 that the card can operate normally. The registration information capacity determination unit 14
It is determined whether or not the amount of registration information stored in the registration information storage unit 12 is equal to or less than a predetermined amount, that is, an amount that can be checked by the registration information check unit 14 in a period until a normal answer-to-reset signal is output. .

The control section 20 is a control section for controlling the above-mentioned respective functional sections. In the present card, the control unit 20 particularly controls the registration information storage unit 12 when the registration information capacity determination unit 14 determines that the amount of the registration information stored in the registration information storage unit 12 is equal to or smaller than a predetermined amount. Is checked by the registration information check unit 14. As a result of the check, if it is determined that the card can operate normally, the ATR output unit 16 outputs an answer-to-reset. If the registration information capacity determination unit 14 determines that the amount of registration information stored in the registration information storage unit 12 exceeds a predetermined amount, the control unit 20 executes a part of the registration information, Registration information checking unit 14 for a certain amount of registration information equal to or less than
Check. After the check, the ATR output unit 16 outputs an answer-to-reset. The control unit 20 further causes the registration information check unit 14 to check the remaining registration information.

The self-diagnosis operation of this card will be described with reference to the flowcharts of FIGS.

In response to an instruction from the control unit 20, the registration information check unit 14 initializes a stack pointer (step 102), and checks the RAM, that is, checks whether data can be correctly written to the RAM (step 10).
4). As a result of RAM check, registration information check unit 1
4 judges whether there is an error (step 106),
If there is an error, the control unit 20 outputs an error status signal (step 110), and returns to step 12 described later.
Proceed to receiving the command No. 8. If there is no error in step 106, the registration information capacity determination unit 14 checks the pointer value of the system registration information stored in the registration information storage unit 12 according to an instruction from the control unit 20, and checks the capacity of the registration information ( (Step 108), it is determined whether the capacity of the registration information is within a certain value (Step 112).

That is, by checking the value of the pointer of the system registration information, it is determined whether or not the capacity of the registration information is an amount that can be checked within the time until an answer-to-reset is output. As a result, as described later, the registration information is checked all before the output of the answer-to-reset, or part of the check is performed before the output, and the rest is performed after the output.

If the capacity of the registration information is within a certain value in step 112, the registration information check unit 14 checks all the registration information in response to an instruction from the control unit 20 (step 114). In this case, since the capacity of the registration information is equal to or less than the predetermined amount, the registration information check unit 14 can check all the registration information before outputting the answer-to-reset. The registration information is checked by checking the BCC (block check code) assigned to each file.

As a result of the registration information check, the registration information check unit 14 determines whether there is an error in the BCC code (step 116).
0 outputs an error status (step 124) and sets a BCC error flag in the registration information (step 1).
26). Thereafter, the flow advances to step 128 for command reception. As a result of checking the registration information, if there is no error, the control unit 20 resets the BCC error flag of the registration information (Step 118) and outputs a control signal to the ATR output unit 16. As a result, the ATR output unit 16 outputs an answer-to-reset signal, that is, a signal indicating that the card can operate normally (step 120).

After outputting the answer-to-reset signal, the registration information check unit 14 initializes and clears the data stored in the RAM (step 122). Next, the control unit 20
Receives the command signal (step 128), determines whether or not the BCC error flag of the registration information has been set (step 130). If the error flag has been set, an error status is output (step 134),
Returning to step 128, the command signal is received again.
If the error flag has not been set, command processing corresponding to the command signal is performed (step 132), and the process returns to step 128 to receive the command signal again.

If the capacity of the registration information is not less than the predetermined value in step 112, a signal to that effect is sent from the registration information capacity determination unit 14 to the control unit 20, and the registration information check unit 14 Initializes and clears the data stored in the RAM (step 136),
A BCC check is performed for registration information up to a certain capacity (step 138). The registration information check unit 14 determines whether there is an error in the BCC code of the registration information (step 140). If there is an error, the control unit 20 sets an error flag of the registration information (step 142), and If not, the error flag of the registration information is reset (step 144). After setting or resetting the error flag, the control unit 20 sets the ATR in either case.
It outputs a control signal to the output unit 16. As a result, the ATR output unit 16 outputs an answer-to-reset signal (step 146).

After outputting the answer-to-reset signal, the control unit 20 determines whether or not the error flag of the registration information is set (step 148). If the error flag of the registration information is set, it means that there is an error in the BCC check for the registration information up to the above-mentioned fixed capacity, and the card is not checked without checking the remaining registration information. Since the operation cannot be performed normally, the process proceeds to step 128, and the operation after receiving the command is performed.

In step 148, when the error flag of the registration information is not set, it means that there is no error in the BCC check of the registration information up to the above-mentioned fixed capacity. Then, the registration information check unit 14 performs a BCC check on the remaining registration information (step 150). After the check, it is determined whether there is an error in the BCC code of the registration information (step 152). If there is an error, the control unit 20 sets an error flag of the registration information (step 154), and there is no error. In this case, the error flag of the registration information is reset (step 156). After setting or resetting the error flag, in any case, the process proceeds to step 128, and the operation after receiving the command is performed.

As described above, according to this embodiment, whether or not the capacity of the system registration information is within a certain value, that is, whether or not the amount can be checked within a predetermined time until an answer-to-reset signal is output. Judgment is made, and if it is within a certain value, BCC check of all registration information is performed.
If there is no error, output an answer-to-reset signal,
Command processing is performed in response to the subsequent command reception. When the capacity of the system registration information exceeds a certain value, after checking the registration information up to a certain capacity, an answer-to-reset signal is output, and then the remaining registration information is checked. Then, after receiving the command, B of the registration information
If there is no error in the CC code, command processing is performed, and if there is an error, an error status is output.

As described above, when the capacity of the system registration information is an amount that can be checked within a predetermined time until the output of the answer-to-reset signal, the registration information is checked and then the answer-to-reset signal is output. If the amount cannot be checked within a predetermined time, after performing a certain amount of checking, an answer-to-reset signal is output,
After that, the remaining registration information is checked. Therefore, in either case, the answer-to-reset signal can be output within a predetermined time. Therefore, even when the registration information is large, the output of the answer-to-reset signal is not delayed. Standards can be satisfied.

In the above embodiment, if the capacity of the system registration information cannot be checked within a predetermined time before the output of the answer-to-reset signal, a certain amount of checking is performed, and A reset signal is output, and then the remaining registration information is checked. If the system registration information has such a large capacity, an answer-to-reset signal is output first, and then all registration information is output. May be checked.

In this case, although not shown, after the initialization of the RAM in step 136 in the above embodiment, the output of the answer-to-reset signal and the B of all the registered information are performed.
A CC check may be performed, and the process may proceed to step 152.

[0024]

According to the IC card of the present invention, in the self-diagnosis processing immediately after startup, when there is a lot of registration information to be checked, at least a part of the check processing is performed before the output of the answer-to-reset signal. Since the answer-to-reset signal is not provided, the answer-to-reset signal can be output within a predetermined time, and the answer-to-reset signal standard can be satisfied without being affected by the capacity of the registration information.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing one embodiment of an IC card according to the present invention.

FIG. 2 is a flowchart showing an operation of a self-diagnosis process of the card of FIG. 1;

FIG. 3 is a flowchart showing an operation of a self-diagnosis process of the card of FIG. 1;

FIG. 4 is a flowchart showing an operation of a self-diagnosis process of the card of FIG. 1;

[Explanation of symbols]

 12 registration information storage unit 14 registration information check unit 16 ATR output unit 18 registration information capacity determination unit

Continuation of front page (56) References JP-A-1-163384 (JP, A) JP-A-1-26995 (JP, A) JP-A-3-233789 (JP, A) JP-A-5-189331 (JP) , A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G06K 19/00 G06K 17/00 G06F 11/22

Claims (3)

(57) [Claims] 1. An IC card comprising storage means for storing data, and performing self-diagnosis as to whether or not normal operation is possible by performing a check at the time of startup of registration information registered in the storage means. Registration information checking means for checking whether or not normal operation is possible for the registration information registered in the storage means; initial message output means for outputting an initial message based on a check result by the registration information checking means; A registration information capacity determination means for determining whether or not the capacity of the registration information registered in the storage means is equal to or less than a predetermined amount; and based on the determination by the registration information capacity determination means, Control means for controlling the initial message output means, the control means, the result of the determination of the registration information capacity determination means, When the capacity of the registration information is equal to or less than a predetermined amount, after the registration information checking means checks all of the registration information, an initial message is output by the initial message output means, and the registration is performed. An IC that outputs the initial message by the initial message output unit without performing at least a part of the check of the registration information by the registration information check unit when the amount of information is not less than a predetermined amount. card. 2. The card according to claim 1, wherein the control unit determines a result of the registration information capacity determination unit by:
If the capacity of the registration information is not less than a predetermined amount, after performing the check by the registration information check means for a certain amount of the registration information, the output of the initial message by the initial message output means, After outputting the initial message, the registration information checking means checks the remaining amount of the registration information as needed. 3. The card according to claim 1, wherein the control unit determines a result of the registration information capacity determination unit,
If the capacity of the registration information is not less than a predetermined amount, an output of an initial message by the initial message output means is performed, and then the registration information is checked by the registration information check means.
card.