JP3337050B2 - 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 a method for exchanging data in the form of a command / response with another device and transmitting the command / response in a block transmission system.
It concerns the C card.

[0002]

2. Description of the Related Art Data exchange between an IC card and another device, particularly an IC card reader / writer, is divided into character transmission and binary transmission. Since character transmission is inefficient in data transmission of one character at a time, binary transmission is usually used when the capacity of the nonvolatile memory of the IC card is large. When transferring data in binary, there is a method of sending the data as a block with a fixed length, but it is usually transferred as a variable length block by attaching a header byte and adding the data length . FIGS. 6A and 6B show examples of a command block and a response block.

FIG. 6A shows an example of a command block 100, and FIG.
Here is an example. The command block 100 includes a header section 10
1, a command section 102, a command accompanying data section 103, and a block check data section 104. The response block 200 includes a header 20
1, a command section 202, a command execution result section 203, a command execution result accompanying data section 204, and a block check data section 205.

When data transfer between an IC card and another device is performed in a variable-length block, a process that the other device wants to use as an IC card is executed in a command block 100.
Is transmitted to the IC card, the IC card receives the command block 100, executes the processing for the command, puts the result in the response block 200, and returns the data to the other device side in the command / response format, and the data transfer is performed. . This is shown in FIG.

In FIG. 7, reference numeral 10A denotes a conventional IC card, which is a command receiving means 11, a command analyzing means 12, a command executing means 16, a response data creating means 17,
Response sending means 18 is provided. Reference numeral 300 denotes another device, and data transfer is performed with the IC card 10A by the command block 100 and the response block 200 shown in FIG.

Conventionally, when command / response blocks 100 and 200 are received, an error (parity error, overrun error, bit loss, etc.) in data transmission between the IC card 10A and the other device 300 is detected. As shown in FIG.
If the received block check data is different from the check data calculated from the received data, an error indication is added to the response and the other device 300 is added.
To the other device 30 that a transmission error has occurred.
If an error is detected on the 0 side, the same data is
By requesting the C card 10A, error-free data transfer is realized.

[0007]

However, the conventional method presupposes that power is supplied to the IC card 10A while the IC card 10A and the other device 300 exchange commands / responses. is there. For this reason,
When the power supply to the IC card 10A is cut off while the IC card 10A that has received the command is executing the processing for the command, the other device 300
Since the response from the IC card 10A does not return, it can be understood that something abnormal has occurred on the IC card 10A side, so that the abnormal processing can be performed. If the power is supplied next time without receiving the command processing, the command processing is not completed, so that a new command is accepted, and there is no way to know whether or not the abnormality occurred in the previous command.

[0008] An object of the present invention is to enable an appropriate response when exchanging data with another device in a command / response format regardless of whether power is supplied or not.
To supply a C card.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve these problems, and a first invention (claim 1) provides a command execution flag in a part of a nonvolatile memory. The command receiving means of the IC card determines that the command block received from the other device has been normally received. When the command execution flag is cleared, the command corresponding flag in the command execution flag table is set. Control means for setting by command execution flag setting means, performing command execution processing, clearing the flag by command execution flag clear means after transmitting a response block.

In a second aspect of the present invention, in the first aspect, when a command is normally received, the command execution flag in the command execution flag table on the nonvolatile memory is read by the command execution flag reference means. When the command is executed, the command execution processing is not performed, and the specific bit in the response block is set by the response creation means. This is used as a flag indicating that an error has occurred and a response is transmitted.

In a third aspect of the present invention, in the first aspect, when the command is normally received, the command execution flag in the command execution flag table in the nonvolatile memory by the command execution flag reference means is used. When the command is executed, the command is executed by the command execution means, and a flag indicating that there was an error during the previous execution of the command is returned as a response. This flag is cleared after transmitting the response set by the creating means.

According to a fourth invention (claim 4), in the second invention, when a command for clearing the command execution flag of the command execution flag table corresponding to the command is received from another device by the command reception means, The flag is referred to by the command execution flag reference means, and the flag is determined by the command execution flag set determination means. If the flag is set, the flag is cleared by the command execution flag clear means.

[0013]

In the first invention, even if the power supply to the IC card is cut off during the execution of a command, a flag indicating which command was being executed remains in the command execution flag table of the nonvolatile memory. When the same command is received by the IC card, the IC card can know that the command was being executed last time.

In the second invention, when the IC card receives a command in which the command-in-progress flag is set, a trouble such as power-off at the IC card side during execution of the same command is sent to the device that transmitted the command. And that the command execution has not been completed normally.

In the third invention, when the IC card receives a command in which the command-in-progress flag is set, the IC card side turns off the power to the device that transmitted the command during the previous execution of the same command. It is possible to notify that the command execution has not been completed normally due to a trouble and to execute the command.

In the fourth invention, since the command-in-progress flag once set in the second invention can be cleared, the command can be executed next by the IC card.

[0017]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 2 shows an IC card 10 according to the present invention.
FIG. 2 shows a hardware block diagram of the first embodiment.

In FIG. 1, reference numeral 10 denotes an IC card according to the present invention, the same reference numerals as in FIG. 7 denote the same parts, 13 denotes a command executing flag reference means, 14 denotes a command executing flag table, and 15 denotes a command executing flag. Setting means,
Reference numeral 19 denotes a command executing flag clear unit, and reference numeral 20 denotes a command executing flag set determining unit.

As shown in FIG. 2, the IC card 10
The chip hardware includes a CPU 31, a program storage memory (ROM) 32, a temporary work memory (RAM) 3
3, a nonvolatile memory (here, an EEPROM (electrically erasable programmable memory)) 34, an I / O port 35, and an external connection interface 36. The external connection interface 36 may be a mechanical contact or a non-contact interface using electromagnetic induction or the like.

FIG. 3 shows an example of the configuration of the command execution flag table 14 provided in the IC card 10 of FIG. In FIG. 3, 141 is command execution flag storage data, 142 is check data of the command execution flag storage data 141, check data for error detection such as CRC, and C1, C2,..., C8 correspond to commands. Indicates command execution flag data. The configuration example of the command block 100 and the response block 200 in FIG. 1 is the same as the block transfer format used in the prior art as shown in FIG.

FIGS. 4 and 5 show examples of the operation flow of the present invention. Hereinafter, the operation of the present invention will be described in detail with reference to this operation flowchart. Note that (1) to (1)
2), (21) to (30) show each step.

First, FIG. 4 mainly shows the first embodiment.
This will be described using.

The IC card 10 is supplied with power from the other device 300 and operates (step (1)
2)), it is waiting to receive the command block 100 from the other device 300. At this time, IC
A command block 100 corresponding to the processing is transmitted to request the card 10 to perform some processing (processing in the IC card such as writing data to the IC card 10 or reading data stored in the IC card 10). On the IC card side, the command block 100 is received by the command receiving means 11 (step (1)). If there is no error in the command block transmission (parity error, block check error, etc.), the command analysis means 12 causes the other device 30 to receive the command block.
The command analysis of the command block 100 sent from 0 is performed (step (2)). Command analysis means 12
Then, it is checked whether the command execution flag for the corresponding command is set from the command execution flag table 14 in the nonvolatile memory 34 by using the command execution flag reference means 13 (step (3)). ). If the corresponding command execution flag is cleared, the command execution flag setting means 15 is used to set a flag corresponding to the command in the command execution flag table (step (4)). Thereafter, the corresponding command is executed using the command executing means 16 (step (5)). Next, the response block 2
Create 00. The response block 200 stores the command execution result and the accompanying data if the execution result has accompanying data (step (6)). The response block 200 is transmitted to the other device 300 that has transmitted the command by using the response transmission unit 18 (step (7)). After successfully transmitting the response block 200, the corresponding command execution flag in the command execution flag table 14 corresponding to the command is cleared using the command execution flag clearing means 19 (step (8)). Thereafter, the flow returns to the command block reception waiting (step (12)) to wait for the next command block 100. In step (3), the command execution flag of the corresponding command in the command execution flag reference unit 13 is set to the command execution flag set determination unit 2.
If it is determined that the command is set to 0, first, it is checked whether the command is a command execution flag clear command (step (9)). If the command from the other device 300 is a command execution flag clear command, the process returns to step (6) to return a response and clear the command execution flag.
In the case of other commands, the response block 20
After setting a bit indicating that an error has occurred during execution of the same command the previous time to 0 (step (10)), the response block 200 is transmitted (step (11)).

Next, another embodiment will be described with reference to the operation flowchart of FIG.

As in FIG. 4, the IC card 10 is
In a state where power is supplied from 00 and operation is being performed, reception of the command block 100 from the other device 300 is awaited (step (30)). At this time, some processing (IC card 10
A command block 100 corresponding to the processing is transmitted in order to request data writing into the IC card or processing in the IC card such as reading of data stored in the IC card 10).
On the IC card 10 side, the command block 100 is received by the command receiving unit 11 (step (21)). If there is no error in the command block transmission (parity error, block check error, etc.), the command analysis unit 1
Command block 1 sent from other device 300 in 2
00 is analyzed (step (22)). The command analysis means 12 determines whether or not the command execution flag for the corresponding command has been set by using the command execution flag reference means 13.
4 is checked out from the command execution flag table 14 (step (23)). If the corresponding command execution flag is cleared, the command execution flag setting means 15 is used to set a flag corresponding to the command in the command execution flag table (step (24)). Thereafter, the corresponding command is executed using the command execution means 16 (step (2)
5)). Next, the response block 200 is created by using the response data creating means 17. The response block 200 stores the command execution result and the accompanying data if the execution result has accompanying data (step (26)). This response block 200
Is transmitted to the other device 300 that has transmitted the command using the response transmission means 18 (step (27)). After the response block 200 has been successfully transmitted, the corresponding command execution flag in the command execution flag table 14 corresponding to the command is cleared using the command execution flag clearing means 19 (step (28)).
After this, wait for command block reception (step (30))
And waits for reception of the next command block 100. If the command execution flag of the corresponding command is set in step (23), a bit (step (29)) indicating that an error has occurred during the previous execution of the same command is set in the response block. , To step (25).

Here, the correspondence between the first to fourth inventions and the flowcharts of FIGS. 4 and 5 is as follows.

According to the first invention, steps (1) to (4) in FIG.
(8) corresponds to steps (21) to (28) in FIG.

According to the second invention, steps (9) to (9) in FIG.
This corresponds to (11).

A third aspect of the present invention relates to the method of FIG.
This corresponds to (25) to (28).

A fourth aspect of the present invention relates to the method of FIG.
This corresponds to (6) to (8).

[0031]

As described above, according to the first aspect, the command execution flag table provided in a part of the non-volatile memory and the IC which determines that the command block received from the other device is normally received. The command receiving means of the card determines, and when the command execution flag is cleared, the command execution flag setting means for setting the command corresponding flag of the command execution flag table, and executing the command by the command execution means Command execution flag clearing means for performing processing and clearing the flag after sending the response block by the response sending means, so that if the power supply to the IC card is cut off during command execution, Even if the IC card is removed from the reader / writer during operation, Because of flags that were running the command remains in the command execution flag table in the nonvolatile memory, IC next time the same command IC card receives
The card can know that the same command was being executed as before, and the device that sent the command, especially the IC
There is no need to analyze the response data from the card and check if there is any pull-out during command execution.

According to the second aspect of the present invention, when a command is normally received, whether the command execution flag is set by referring to the command execution flag in the command execution flag table in the nonvolatile memory by the command execution flag reference means. When set by the command execution flag set judgment means, the command execution processing is not performed and a specific bit in the response block is set by the response creation means to indicate that there was an error during the previous command execution. When the IC card receives a command in which the command in progress flag is set, the power is turned off on the IC card side while the same command is being executed by the device that sent the command because the response is transmitted by using the flag as a response. Sent a command indicating that command execution was not completed normally due to a problem Location can be informed without using a special means.

According to the third aspect of the present invention, when a command is normally received, whether or not the command execution flag is set by referring to the command execution flag in the command execution flag table in the nonvolatile memory by the command execution flag reference means. When the flag is determined by the command execution flag set determination means, the command processing is executed by the command execution means, and a response indicating that an error occurred during the previous execution of the command is set by the response creation means. Since the flag is cleared later, when the IC card receives a command in which the command in-progress flag is set, the IC card side may turn off the power to the device that transmitted the command during the previous execution of the same command. Notify the device that sent the command that the command execution has not been completed normally due to a problem. It is possible to notify the current state of the IC card executes the command.

According to the fourth aspect, when a command for clearing the command execution flag of the command execution flag table corresponding to the command is received from another device by the command receiving means, the flag is referred to as the command execution flag. If the command execution flag is set by judging by the command execution flag setting judging means, the flag is cleared by the command execution flag clearing means, so that the once set command execution flag can be cleared. The command can be executed by the IC card, and the current status of the IC card can be known by the device that transmitted the command.

[Brief description of the drawings]

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

FIG. 2 is a hardware block diagram of an IC card to which the present invention is applied.

FIG. 3 is a diagram showing a configuration example of a command execution flag table used in the present invention.

FIG. 4 is a diagram showing a first example of an operation flow of the embodiment in FIG. 1;

FIG. 5 is a diagram showing a first example of an operation flow of the present invention.

FIG. 6 is a block diagram of a conventional IC card.

FIG. 7 is a diagram illustrating a configuration example of a command / response block.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 IC card 11 Command receiving means 12 Command analyzing means 13 Command running flag reference means 14 Command running flag table 15 Command running flag setting means 16 Command running means 17 Response data creation means 18 Response sending means 19 Command running flag clear Means 20 Command execution flag set determining means 31 CPU 32 ROM 33 RAM 34 EERPOM 35 I / O 36 External connection interface 100 Command block 200 Response block 300 Other device

Claims (4)

(57) [Claims] An information processing apparatus includes a non-volatile memory, and performs a read / write operation on the non-volatile memory by receiving a command sent from another device by a command receiving unit, and executing the command by executing a command. Means for performing an operation execution result as a command / response by a response sending means, and performing the command / response by block transmission. A command execution flag table provided in a part of the nonvolatile memory; The command receiving means of the IC card determines that the command block received from the other device has been normally received, and sets the command corresponding flag in the command executing flag table when the command executing flag is cleared. Command execution flag setting means, and the command execution means Ri performs command execution processing, IC card, characterized in that a command execution flag clearing means for clearing the delivery after the flag by the response transmitting unit a response block. 2. The IC card according to claim 1, wherein when the command is normally received, the command execution flag reference means refers to the command execution flag in the command execution flag table on the nonvolatile memory and is set. If the command execution flag is set by the command execution flag setting means, the command execution processing is not performed and the specific bit in the response block is set by the response creation means to confirm that there was an error during the previous command execution. An IC card for transmitting a response by using the flag as an indicating flag. 3. The IC card according to claim 1, wherein when the command is normally received, the command execution flag reference unit refers to the command execution flag in the command execution flag table on the nonvolatile memory and is set. When the command is executed by the command execution unit, the command execution unit executes the command processing, and sets a flag indicating that there was an error during the previous execution of the command by the response creation unit. An IC card wherein the flag is cleared after transmission. 4. The command card according to claim 2, wherein when a command for clearing the command execution flag in the command execution flag table corresponding to the command is received from another device by the command receiving means, the command execution flag is set. An IC card characterized in that the flag is cleared by a command execution flag clearing means, which is referred to by a reference means and set by the command execution flag setting judging means if judged and set by the command executing flag clearing means.