JPH1115931A - Card identification system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce communication time by allowing only a card which performs collation coincidence with self-ID information to make each command of read and write valid and permitting to read and write memory. SOLUTION: A collating means 13 receives an ID code signal S10 from an ID code temporary storing means 12, reads content which is preliminarily stored in an ID area 11 of memory 9 as an ID information signal S11, compares and collates it with the signal S10 and outputs a coincidence signal S12 when they coincides with each other as a result. After the read or write of data from/to a specific area 10 of the memory 9 is finished completely, a reader/writer 1 sends a deactivation command, and when it is inputted to an activating means 16 through a deactivation detection signal S15, an activation signal S13 that is in an output state so far is released. Subsequently, read and write executing means 6 and 8 do not perform operations until the re-output of the signal S13 is performed due to the collation coincidence of an ID card.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a card identification system in a case where there are a plurality of cards for supplying and communicating power with a reader / writer by electromagnetic induction.

[0002]

2. Description of the Related Art Conventionally, in this type of card identification method, an ID code is attached to a read command and a write command from a reader / writer, and the ID code is designated when reading or writing data to or from a memory of the card. Each time, the ID is checked against ID information stored in the card in advance, and it is determined whether read / write is to be performed. This is disclosed, for example, in Japanese Patent Laid-Open No. 6-1875.
No. 15, which will be described below with reference to the functional block diagram of FIG.

In FIG. 3, a reader / writer 1 and a card 2
Means that power supply and communication are performed by electromagnetic induction through the respective coils L1 and L2. The card 2 is configured to receive a read or write command while receiving power supply from the reader / writer 1, and to return data corresponding to each command to the reader / writer 1 after executing the command. A communication means 3 for controlling the coil L2 to communicate with the reader / writer 1 and for inputting / outputting a transmission signal and a reception signal with the control means 4; While identifying the code, ID code and write data, and outputting them as received data,
Control means 4 for generating a transmission signal from transmission data; read command detection means 5 for detecting a read command as a command code; similarly, write command detection means 7 for detecting a write command; Read execution means 6 for performing write operation, write execution means 8 for similarly performing write operation, ID code temporary storage 12 for temporarily storing the received ID code,
ID area 11 in memory 9 that stores ID information
And collating means 13 for collating each of the contents. Means relating to power supply control inside the card 2, such as reception of a power signal from the reader / writer 1, smoothing, and supply of voltage to each circuit, are not directly related to the present invention, and will not be described.

First, when transmission from the reader / writer 1 is performed, the card 2 receives this by the communication means 4 and sends it to the control means 4 as a reception signal S1. The control means 4 identifies the command code from the received signal S1, outputs the command identification signal S3, and simultaneously outputs the command code as received data S4. The read command detecting means 5 and the write command detecting means 7 fetch the received data S4 as a command code by receiving the command identification signal S3 from the control means 4, and when the received data S4 coincides with a predetermined code, read detection is performed. Signal S6
Alternatively, one of the signals is output as the write detection signal S8. At this time, the reception signal S1 has been input with the ID code following the command code, and the control means 4 outputs the ID code as the reception data S4. Generally, the reception data S4 and transmission data S5 described later are data buses, and different data are input and output in a time-division manner. In the ID code temporary storage unit 12, when either the read detection signal S6 or the write detection signal S8 is input, the reception data S4
Is stored as an ID code. At the same time, the matching means 13 receives the ID code signal S10 from the ID code temporary storage means 12 and
1 is stored in the ID information signal S1.
1 and read out the ID information signal S11 and the I
Comparison and collation with the D code signal S10 are performed, and when they match, a match signal S12 is output.

When the coincidence signal S12 is in the output state, that is, when the ID code transmitted accompanying each command from the reader / writer 1 matches its own ID information stored in advance, Read detection signal S
In response to the output of the write detection signal S8 or the write detection signal S8, the read execution means 6 or the write execution means 8 starts operating. For example, when the write detection signal S8 is output, the write execution unit 8 outputs the write control signal S9 to execute the write operation, and inputs the received data S4 to the specific area 10 of the memory 9 to store the contents. To control. It is assumed that write data is input to the reception signal S1 following the ID code, and write data is output as the reception data S4. On the other hand, when the read detection signal S6 is output, the read execution means 6 outputs the read control signal S7 to execute the read operation, and outputs the contents stored in the specific area 10 of the memory 9 as the transmission data S5. To control. The transmission data S5 is output by the control means 4 as a transmission signal S2,
Is returned to the reader / writer 1 through.

Here, if the above-mentioned coincidence signal S12 is not output, that is, the ID code transmitted accompanying each command from the reader / writer 1 does not match its own ID information stored in advance. If it is,
Neither the read executing means 6 nor the write executing means 8 operate, and the reading and writing of data to the specific area 10 of the memory 9 are not executed. As described above, the ID code is collated each time a read command or a write command is transmitted, and the read or write operation corresponding to each command is performed only when the ID code stored in advance matches its own ID information. Will be executed.

[0007]

As described in the section of the prior art, every time data is read from or written to the memory 9 of the card 2, the ID
The code is received and collation is performed, and it is necessary to transmit an ID code accompanying each read command or write command from the reader / writer 1. Although depending on the application, there are usually a plurality of types of data to be read or written, each of which is often classified and stored in the memory 9, and each of the scattered data has a predetermined address. Is required to perform reading or writing, so that the read command or the write command is executed many times. Also, the ID area 11 of the memory 9
Since the ID information stored in advance in each of the cards must have different contents for each individual card, the capacity is large, and the length of the ID code sent from the reader / writer 1 at the time of verification is inevitable. Will be longer. Therefore, a long ID code is transmitted from the reader / writer 1 many times, and communication with the card 2 takes time.

An object of the present invention is to solve the above-mentioned problems and to provide a card identification system capable of performing quick communication while having a card identification function at the same level as the conventional one. .

[0009]

In order to achieve the above-mentioned object, the present invention comprises a reader / writer and a card for supplying and communicating power by electromagnetic induction, and the card has a built-in memory, Read execution means and write execution means for reading and writing data to and from a specific area of the memory in response to a read command and a write command from the reader / writer, and an ID code attached to the command from the reader / writer, In a card identification method having a collation means for collating an ID code with its own ID information stored in advance, the ID code is attached only to an activation command from the reader / writer and stored in the card in advance. Active if the ID information matches the ID information Shifts to state, to allow access to a specific area of the memory, after the access is completed activation state is canceled by deactivation command from the reader-writer, the I by the activation command again
An activation unit that disables access to a specific area of the memory as an inactive state until the D code matches the ID information stored in the card in advance. I do.

When the activation means of the card is in the activated state and receives an activation command from the reader / writer, the collation between the attached ID code and its own stored ID information does not match. If
It is characterized in that the active state is released and the state becomes inactive, so that access to a specific area of the memory is disabled.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a functional block diagram illustrating the present invention. Of the numbers assigned to the functional blocks and signal lines in FIG. 1, those having the same numbers as those in FIG. 3 have the same functions as those described in the related art. The card 2 is provided with an activation command detection unit 14 and a deactivation command detection unit 15, and has a function of detecting both command codes of an activation command and a deactivation command as commands transmitted from the reader / writer 1. ing. Further, an activating means 16 is provided for controlling the execution of the read and write operations in accordance with the result of collation between these commands and the ID code.

First, prior to transmission of a read command or a write command, the reader / writer 1 transmits an activation command with an ID code attached thereto. When the communication means 3 of the card 2 receives this and outputs the reception signal S1, the command identification signal S3 is output from the control means 4, and at the same time, the command code is output as the reception data S4.
Upon receiving the command identification signal S3, each of the command detection units of the read command detection unit 5, the write command detection unit 7, the activation command detection unit 14, and the deactivation command detection unit 15 fetches a command code as the reception data S4, It is determined whether the code matches a predetermined code. At this time, since the activation command has been received, only the activation command detecting means 14 detects the activation command and outputs the activation detection signal S14. At this time, the reception signal S
Reference numeral 1 denotes a command code followed by an ID code, and the control means 4 outputs this ID code as received data S4. ID code temporary storage means 1
In step 2, when the activation detection signal S14 is input, the reception data S4 is captured and stored as an ID code. At the same time, the matching means 13 receives the ID code signal S10 from the ID code temporary storage means 12, reads out the contents stored in advance in the ID area 11 in the memory 9 as the ID information signal S11, S11
Is compared with the ID code signal S10 described above.
As a result, if they match, a match signal S12 is output. When the coincidence signal S12 is in the output state and the activation detection signal S14 is output, the activation means 16 outputs the activation signal S13. The output of the activation signal S13 is held until a deactivation detection signal S15 described later is input, and during this time, is continuously input to the read execution unit 6 and the write execution unit 8.

Next, the reader / writer 1 transmits a read command or a write command. Of the operations based on these commands, the portion related to the operation of reading or writing data to or from the specific area 10 of the memory 9 is a conventional technology. The contents are the same as those described in. What is different from the above-described conventional technology is that no ID code is attached to each of the read and write commands,
That is, the collating operation is not performed each time. That is, after a read or write command is transmitted from the reader / writer 1 and received by the communication means 4 of the card 2, the control means 4 outputs a command identification signal S3 and received data S4 as a command code, and detects a read command. The operation up to the capture by the means 5 or the write command detection means 7 and the output of the read detection signal S6 or the write detection signal S8 is the same as the operation described in the prior art, but thereafter, the transmission of the ID code from the reader / writer 1 is performed. Is not done. At this time, since the activation signal S13 has been input to the read execution unit 6 and the write execution unit 8, the read control signal S7 or the write control signal S7 or the write control signal S8 is input according to the input of the read detection signal S6 or the write detection signal S8, respectively. By outputting S9, the reading or writing of data to the specific area 10 of the memory 9 is controlled. This read or write control, in the case of read, the control means 4 through the transmission data S5,
Further, the operation of the reply from the communication means 3 is the same as that described in the section of the prior art.

Thereafter, the above operation of the read command or the write command is repeated for each predetermined data, and after all the reading or writing of the data to the specific area 10 of the memory 9 is completed, the deactivation command is issued from the reader / writer 1. Sent. This deactivation command is considered in the same manner as the other commands described above, and the detection by the deactivation command detection means 15 and the deactivation detection signal S
Look at the output of 15. When the activation means 16 receives this inactivation detection signal S15, the activation means 16 cancels the activation signal S13 which has been in the output state until now. Therefore, thereafter, the read execution unit 6 and the write execution unit 8 do not operate until the next activation command is transmitted and the activation signal S13 is re-output by collation matching of the ID code, and as a result, Reading and writing to the memory 9 by the read command and the write command cannot be performed.

Here, consider a case where the card 2 cannot normally receive the deactivation command. For example, when the card 2 is located near the boundary of the communicable area with the reader / writer 1, the level of the signal received from the reader / writer 1 becomes small, and the command may not be recognized normally. When the card 2 cannot normally receive the deactivation command, the card 2 remains in the activated state. In this state, it is assumed that the reader / writer 1 has transmitted an activation command to another card. The other cards are activated, and the previous card 2 remains activated.
At the same time, the two cards are in the activated state, and both cards operate in response to a subsequent read command or write command from the reader / writer. In particular, if the write command is erroneously executed, the contents of the memory 9 will be rewritten and the data will be destroyed. Therefore, when the activation command is received from the reader / writer 1 as the activation means 16,
If the comparison between the D code and the ID information of the card 2 itself does not match, the activation signal S13 is released. As described above, since the ID information has different contents for each individual card, when an activation command for another card is received, the accompanying ID code is different from the ID information of the card 2 itself, Signal S13
Is released, the read execution means 6 and the write execution means 8 do not operate, and no malfunction is caused by the read command and the write command. Note that only the inactivation command is taken as a case where a command from the reader / writer 1 cannot be normally received. This is because other commands do not need to have a corresponding function. That is, if the activation command cannot be normally received, the read / write command is not executed because the activation state is not established, and if the read or write command cannot be normally received, those commands are naturally executed. Is not executed, so that a fatal problem such as destruction of data in the memory 9 does not occur.

The above operation will be described with reference to a flow chart. FIG. 2 shows the operation flow of the functional block diagram of FIG. 1, and mainly shows the operation on the card 1 side. First, in step 100, an activation command transmitted from the reader / writer 1 is received. Next, the ID code received along with the activation command received in step 101 is collated,
When the ID information matches the ID information stored in advance of the card 2 itself, the process proceeds to step 102, and when the ID information does not match, the process proceeds to step 120. In step 102, the state changes to the state in which the activation signal S 13 is output, that is, the activation state. Therefore, the reading from the memory 9 in step 104 by the reception of the read command in step 103 and the subsequent step 105. Is returned, or writing to the memory 9 is performed in step 107 by receiving the write command in step 106. These steps 103 to 107
The execution order differs depending on the application used, and may be repeatedly executed in some cases. However, FIG. Now,
When a series of data reading and writing operations are completed, in step 108, a deactivation command is received. If the signal has been received normally, the process proceeds to step 109, in which the output of the activation signal S13 is released, that is, to the inactive state, and the process returns to step 100 until the next activation command is received. If the deactivation command is not normally received, the process returns to step 100 in the activated state.

On the other hand, if the collation of the ID code does not match in step 101, if it is in the inactive state, it is kept in step 120, and if it is in the active state, The state shifts to the inactive state, and in any case, the state becomes the inactive state. Thereafter, even if the read command is received in step 121 or the write command is received in step 123, the operations shown in steps 122 and 124 are performed. As described above, the process proceeds to step 108 without performing the data read and write operations on the memory 9 and receives the deactivation command, but shifts to the deactivated state in step 109 (in this flow, the deactivated state is maintained). Step 100 waits for the reception of the activation command.

[0018]

As is apparent from the above description, according to the first aspect of the present invention, the ID code needs to be transmitted only once in association with the activation command. Only the card that matches and matches the read and write commands are enabled and are allowed to read and write to the memory, so that transmission is performed with an ID code attached to each command as in the prior art. The communication between the reader / writer and the card can be performed in a shorter time than in the case where it is necessary to read and write the memory frequently. In such an application, the effect of shortening the communication time is particularly remarkable, and according to the second aspect of the present invention, the communication with the reader / writer is uneasy. Therefore, even if the card cannot be received normally, there is a great effect in providing a high-performance card identification method capable of minimizing a fatal problem such as memory data destruction due to a read / write command malfunction. .

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a flowchart showing a flow of an operation of the configuration shown in FIG.

FIG. 3 is a functional block diagram showing a configuration of a conventional technique.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 reader / writer 2 card 9 memory 10 specific area 11 ID area 12 ID code temporary storage area 13 verification means 14 activation command detection means 15 deactivation command detection means 16 activation means S12 coincidence signal S13 activation signal S14 activation detection Signal S15 Deactivation detection signal

Claims (2)

[Claims] 1. A card comprising a reader / writer and a card for supplying and communicating power by electromagnetic induction. The card has a built-in memory and a read / write command from the reader / writer to a specific area of the memory. Read execution means and write execution means for reading and writing data with respect to
An ID code is attached to the command from the reader / writer, and an activation command from the reader / writer is provided in a card identification system having a collation unit for collating the ID code with its own ID information stored in advance. The ID code is attached only to the memory card. If the ID information is matched with its own ID information stored in advance in the card, the state is shifted to an activated state, access to a specific area of the memory is enabled, and access is completed. Thereafter, the activation state is released by a deactivation command from the reader / writer, and the ID code and its own I.D. stored in advance in the card are again released by the activation command.
A card identification method comprising activation means for making inaccessible a specific area of the memory in an inactive state until the D information matches the collation. 2. The card identification system according to claim 1, wherein said activation means of said card is in an activated state, and when an activation command is received from said reader / writer, said card is stored in advance with an associated ID code. If the collation with its own ID information does not match, the activation state is released to the inactivation state, and access to a specific area of the memory is disabled. Identification method.