JP2007004284A - Storage device and its method for data write-in processing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve processing efficiency. <P>SOLUTION: As for the data write-in processing of a non-contact IC card 3, when executing logical/physical address rewriting processing, only the physical address "X" of a data storage region where new data are written is saved so that it is possible to reduce write-in data quantity in data write-in processing, and to sharply improve the result processing efficiency compared with the conventional method. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a storage device and a data writing processing method therefor, for example, data received from an adjacent reader / writer device when it is approached to a reader / writer device and written to an internal memory. It is suitable for application to a non-contact IC (Integrated Circuit) card that executes a writing process.

  Conventionally, this type of non-contact IC card generates electromagnetic power emitted from an adjacent reader / writer device and rectifies it to generate drive power for driving the non-contact IC card, and the generated drive Data writing processing or the like can be executed by electric power.

  If the non-contact IC card is separated from the reader / writer device, the electromagnetic wave emitted from the reader / writer device cannot be sufficiently received, and as a result, the driving power is reduced and the data writing process is interrupted. It can happen.

  When the data writing process is interrupted in this way, there is a possibility that the data that was the target of the data writing process is destroyed. For this reason, conventionally, there has been proposed a method for guaranteeing data that has been a target of data writing processing (see, for example, Patent Document 1).

  Here, the conventional method will be described with reference to FIGS. In the memory of the non-contact IC card to which this conventional method is applied, physical position information (physical address) indicating the physical position of the data storage area corresponds to each data storage area in which data from the reader / writer device is written. A data storage area AR101 is provided. Further, the memory of this non-contact IC card associates the logical position information (logical address) of the data storage area logically recognized by the reader / writer device with the physical address of the data storage area corresponding to this logical address. A logical address storage area AR102.

  For example, when the control unit of the non-contact IC card is instructed by the reader / writer device to write new data to the logical address “A”, the data writing process (steps SP101 to SP105) for writing the new data is performed. Start running.

  First, the control unit of the non-contact IC card refers to the logical / physical address storage area AR102 as shown in FIG. 7A, and associates it with the logical address “TEMP” indicating the data storage area where data can be written. The recognized physical address “Y” is recognized, and new data is written in the data storage area of the recognized physical address “Y” (step SP101).

  Next, the control unit of the non-contact IC card rewrites the logical / physical address storage area AR102 so that the logical address “A” in the logical / physical address storage area AR102 indicates the data storage area in which the new data is written. Processing is executed (steps SP102 to SP105).

  That is, in the logical / physical address rewriting process, as shown in FIG. 7B, the logical address “A” in the logical / physical address storage area AR102 and the physical address “X” associated with the logical address “A” And the physical address “Y” associated with the logical address “TEMP” in the logical / physical address storage area AR102 is saved in the logical / physical address saving area AR103. It is saved in the logical / physical address save area AR103 so as to be associated with “TEMP” (step SP102).

  Next, in this logical / physical address rewriting process, rewrite processing status information indicating whether the logical / physical address rewriting process is being executed or not being executed. The rewrite process status information in the stored rewrite process information storage area AR104 is rewritten to indicate that the logical / physical address rewrite process is being executed (step SP103). In this case, if this rewrite processing status information is “0”, it indicates that the logical / physical address rewrite processing is not in progress, and if it is “1”, the logical / physical address rewrite processing is executed. It shows that it is in the middle.

  Subsequently, in this logical / physical address rewriting process, as shown in FIG. 8C, the physical address “X” associated with the logical address “A” in the logical / physical address saving area AR103 is assigned to the logical / physical address storage area AR102. The logical address “TEMP” is written to the logical / physical address storage area AR102 and the physical address “Y” associated with the logical address “TEMP” in the logical / physical address save area AR103 is set to the logical / physical address. The logical address “A” in the storage area AR102 is associated with the logical address “A” and written to the logical / physical address storage area AR102 (step SP104).

  In this logical / physical address rewrite process, the rewrite process status information in the rewrite process information storage area AR104 is rewritten so as to indicate that the logical / physical address rewrite process is not being executed (step SP105).

  Thus, when the control unit of the non-contact IC card is instructed by the reader / writer device to read data from the logical address “A” thereafter, the logical address is referred to by referring to the logical / physical address storage area AR102 accordingly. The physical address “Y” associated with “A” is recognized, and new data stored in the data storage area of the recognized physical address “Y” can be read.

  When the control unit of the non-contact IC card is once separated from the reader / writer device and restarted by being approached again, the rewrite processing status information in the rewrite processing information storage area AR104 executes the logical / physical address rewriting process. If it remains in the middle of being executed, it is determined that the data writing process has been interrupted while step SP104 is being executed.

  In this case, in the logical / physical address saving area AR103, the logical address “A” instructed as the write destination of the new data, the physical address “X” associated with the logical address “A”, and the new data are actually stored. The physical address “Y” written in is saved.

  Thereby, the control unit of the non-contact IC card, for example, uses the physical address “X” associated with the logical address “A” in the logical / physical address saving area AR103 as the logical address “A” in the logical / physical address storage area AR102. And the physical address “Y” associated with the logical address “TEMP” in the logical-address save area AR103 is stored in the logical-address storage area AR102. Write back to the logical / physical address storage area AR102 so as to be associated with the logical address “TEMP”.

  As a result, when the control unit of the non-contact IC card is instructed by the reader / writer device to read data from the logical address “A” thereafter, the logical address is referred to by referring to the logical / physical address storage area AR102 accordingly. The physical address “X” associated with “A” is recognized, and the old data stored in the data storage area of the recognized physical address “X” can be read.

Thus, according to this conventional method, even if the data writing process for writing new data instructed by the reader / writer device is interrupted, at least the old data before executing this data writing process can be guaranteed.
JP 2003-178281 A

  By the way, in the non-contact IC card to which such a conventional method is applied, when the logical / physical address rewriting process is executed, the logical address “A” instructed as the write destination of the new data is associated with the logical address “A”. Since the physical address “X” and the physical address “Y” where the new data is actually written need to be saved in the logical / physical address saving area AR103, the amount of data to be written during the data writing process increases accordingly. Therefore, there is a problem that it is difficult to say that the processing efficiency is good.

  The present invention has been made in consideration of the above points, and an object of the present invention is to propose a storage device capable of improving the processing efficiency and a data write processing method thereof.

  In order to solve such a problem, in the present invention, a data storage area in which a physical address indicating a physical position of the data storage area is associated with each data storage area to which data is written, and a logical position of the data storage area Indicating that a valid address is stored in the physical address of the data storage area corresponding to the logical address and the data storage area, or that no valid data is stored in the data storage area. A logical / physical address storage area that associates and stores valid information representing either one and a logical / physical address rewrite process for rewriting the logical / physical address storage area, or a logical / physical address rewrite process is not being executed. Is stored, and the corresponding logical address is rewritten by the logical address rewriting process. A data write process for writing the data so that the data is stored in a data storage area corresponding to the logical address instructed from the outside, and a memory having a rewrite processing information storage area in which a physical address is saved Provided with a write processing unit to be executed, in the data write processing, valid information indicating that valid data is not stored is detected from the valid information stored in the logical / physical address storage area, and the detected valid Write data to the data storage area of the physical address associated with the information, rewrite the rewrite processing status information in the rewrite processing information storage area to indicate that the logical / physical address rewrite processing is being executed, and The physical address of the data storage area where the data is written is saved in the rewrite processing information storage area, and the physical address of the data storage area where the data is written is saved. The logical address associated with the address is rewritten to the logical address instructed from the outside, and the valid information associated with the physical address is rewritten to indicate that valid data is stored, and the logical / physical address storage area The logical address that is the same as the logical address associated with the physical address is detected, and the valid information associated with the detected logical address is rewritten to indicate that no valid data is stored. The rewrite process status information in the rewrite process information storage area is rewritten so as to indicate that the rewrite process is not being executed.

  According to this data writing process, when executing the logical / physical address rewriting process, it is only necessary to save only the physical address of the data storage area in which the data is newly written. The amount of write data during the write process can be reduced.

  According to the present invention, when executing the logical / physical address rewriting process, it is only necessary to save only the physical address of the data storage area into which data has been newly written. The amount of write data at the time can be reduced, and as a result, the processing efficiency can be significantly improved.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

(1) Configuration of Contactless IC Card in Proximity Wireless Communication System In FIG. 1, reference numeral 1 denotes a proximity wireless communication system as a whole, a reader / writer device 2 and a contactless IC card 3 that performs proximity wireless communication with the reader / writer device 2. Have Incidentally, as this proximity wireless communication system, for example, a system such as FeliCa (R) system or ISO14443A / B is applied.

  As shown in FIG. 2, the non-contact IC card 3 includes an antenna unit 4 that receives electromagnetic waves from a reader / writer device 2 that is adjacent to the non-contact IC card 3 and drives the non-contact IC card 3 by rectifying the received electromagnetic waves. And a driving power generation unit 5 that generates driving power.

  The control unit 6 of the non-contact IC card 3 controls the writing / reading unit 7 by the driving power generated by the driving power generation unit 5, and sequentially passes the reader / writer device 2 through the antenna unit 4 and the transmission / reception unit 8. A data writing process for writing the received data to the nonvolatile memory 9 can be executed, and the data is read from the nonvolatile memory 9 and is sequentially transmitted to the reader / writer device 2 via the transmission / reception unit 8 and the antenna unit 4. Data transmission processing to be transmitted can be executed.

  Incidentally, in the case of the present embodiment, the control unit 6 expands a program stored in a program ROM (Read Only Memory) 10 in a RAM (Random Access Memory) 11 and controls the entire contactless IC card 3 according to the expanded program. CPU (Central Processing Unit) 12 etc. which perform various processing for doing.

  As shown in FIG. 3, the nonvolatile memory 9 of the non-contact IC card 3 has physical location information indicating the physical location of the data storage area for each data storage area to which data from the reader / writer device 2 is written. It has a data storage area AR1 associated with (physical address).

  Further, the non-volatile memory 9 of the non-contact IC card 3 includes logical position information (logical address) of the data storage area that is logically recognized by the reader / writer device 2 and the data storage area corresponding to the logical address. It represents either the physical address and the fact that valid data to be read by the reader / writer device 2 is stored in the data storage area or that no valid data is stored in the data storage area. It has a logical / physical address storage area AR2 for storing valid information in association with it. Incidentally, in the case of this embodiment, this valid information indicates that valid data to be read by the reader / writer device 2 is stored when it is “1”, and valid data is stored when it is “0”. It is made to indicate that it is not.

  Further, the non-volatile memory 9 of the non-contact IC card 3 is in the middle of executing a logical / physical address rewriting process for rewriting the logical / physical address storage area AR2, or in the middle of executing a logical / physical address rewriting process. The rewrite processing information storage area AR3 stores rewrite processing status information representing any of the above and a physical address at which the corresponding logical address is rewritten by this logical / physical address rewrite processing. Incidentally, in the case of this embodiment, when the rewrite processing status information is “1”, it indicates that the logical / physical address rewrite processing is being executed, and when it is “0”, the logical / physical address rewrite processing is executed. It is made to indicate that it is not in the middle of doing.

  For example, when the reader / writer device 2 commands the control unit 6 of the non-contact IC card 3 to write new data to the logical address “A”, the control unit 6 performs the data write processing procedure RT1 shown in FIG. Execution starts from SP1.

  That is, in step SP1, the control unit 6 of the non-contact IC card 3 executes a scanning process for sequentially referring to the valid information in the logical / physical address storage area AR2, as shown in FIG. After detecting valid information indicating that it is not stored, the physical address “X” associated with the detected valid information is recognized, and the data storage area of the recognized physical address “X” is recognized. Write new data.

  Next, the control unit 6 of the non-contact IC card 3 indicates that the logical address “A” instructed to write new data from the reader / writer device 2 indicates the data storage area of the physical address “X” in which the new data is written. Then, a logical / physical address rewriting process is performed to rewrite the logical / physical address storage area AR2.

  That is, in the next step SP2, as shown in FIG. 3B, the control unit 6 of the non-contact IC card 3 stores the rewrite processing information so as to indicate that the logical / physical address rewrite processing is being executed. The rewrite processing status information in the area AR3 is rewritten, and the physical address “X” of the data storage area in which the new data is written is stored (saved) in the rewrite processing information storage area AR3.

  In the subsequent step SP3, as shown in FIG. 4C, the controller 6 of the non-contact IC card 3 corresponds to the physical address “X” of the data storage area in which the new data is written in the logical / physical address storage area AR2. The assigned logical address is rewritten to the logical address “A” instructed to write new data from the reader / writer device 2, and valid information associated with the physical address “X” is changed to valid. Rewrite to indicate that correct data is stored.

  Next, in step SP4, as shown in FIG. 4D, the control unit 6 of the non-contact IC card 3 executes a scanning process for sequentially referring to the logical addresses in the logical / physical address storage area AR2, thereby creating new data. The logical address “A” that is the same as the logical address “A” associated with the physical address “X” of the data storage area in which is written is detected, and valid information associated with the detected logical address “A” is Rewrite to indicate that valid data is not stored.

  Subsequently, in step SP5, the control unit 6 of the non-contact IC card 3 changes the rewrite process status information in the rewrite process information storage area AR3 so as to indicate that the logical / physical address rewrite process is not being executed. Then, the process proceeds to an end step SP6, and the data writing processing procedure RT1 is ended.

  By the way, the control unit 6 of the non-contact IC card 3 has interrupted the data writing process for writing new data due to, for example, the drive power supplied from the drive power generation unit 5 being cut off. In this case, when the supply of drive power from the drive power generation unit 5 is resumed, the correction processing procedure RT2 for correcting the logical / physical address storage area AR2 so that the data corresponding to the logical address “A” can be read correctly (FIG. 6). ) Has been made to perform.

  That is, if the rewrite processing status information in the rewrite processing information storage area AR3 indicates that the logical / physical address rewrite process is being executed, the control unit 6 of the non-contact IC card 3 rewrites the logical / physical address. It is determined that the data writing process has been interrupted while the process is being executed, and the correction processing procedure RT2 is started from step SP21.

  In step SP21, for example, after recognizing the physical address “X” saved in the rewrite processing information storage area AR3, the control unit 6 of the non-contact IC card 3 sets the physical address “X” in the logical / physical address storage area AR2. With reference to the associated valid information, it is determined whether or not it is indicated that valid data is stored in the referenced valid information.

  If a negative result is obtained in this step SP21, this means that effective data is not stored in the valid information as shown in FIG. 3B, so that a post-processing step in step SP2 is performed. This means that the data writing process is interrupted before the processing of SP3, and at this time, the control unit 6 of the non-contact IC card 3 is not in the middle of executing the logical / physical address rewriting processing by moving to step SP22. After changing the rewrite process status information in the rewrite process information storage area AR3 so as to indicate that, the process proceeds to an end step SP23, and the correction process procedure RT2 is ended. As a result, when the reader / writer device 2 instructs the controller 6 of the non-contact IC card 3 to read data from the logical address “A” thereafter, the controller 6 refers to the logical / physical address storage area AR2 accordingly. Thus, the physical address “Y” associated with the logical address “A” can be recognized, and the old data stored in the data storage area of the recognized physical address “Y” can be read.

  On the other hand, if a positive result is obtained in step SP21, this indicates that valid data is stored in the valid information as shown in FIGS. 4C and 4D. This means that the data writing process is interrupted after the process of step SP3. At this time, the control unit 6 of the non-contact IC card 3 moves to step SP24, and this valid information is not stored with valid data. Rewrite to indicate the effect.

  Next, the control unit 6 of the non-contact IC card 3 moves to step SP25, and scans the logical address “A” that is the same as the logical address “A” associated with the rewritten valid information from the logical / physical address storage area AR2. And it is determined whether or not valid data associated with the detected logical address “A” indicates that valid data is stored.

  If a positive result is obtained in step SP25, this means that valid data is stored in the valid information as shown in FIG. 4C. This means that the data writing process is interrupted before the process of the subsequent step SP4. At this time, the control unit 6 of the non-contact IC card 3 moves to step SP22 and executes the logical / physical address rewriting process. After rewriting the rewrite process status information in the rewrite process information storage area AR3 so as to indicate that it is not in the middle, the process proceeds to an end step SP23 to end the correction process procedure RT2. As a result, when the reader / writer device 2 instructs the controller 6 of the non-contact IC card 3 to read data from the logical address “A” thereafter, the controller 6 refers to the logical / physical address storage area AR2 accordingly. Thus, the physical address “Y” associated with the logical address “A” can be recognized, and the old data stored in the data storage area of the recognized physical address “Y” can be read.

  On the other hand, if a negative result is obtained in step SP25, this means that, as shown in FIG. 4D, it is not indicated that valid data is stored in the valid information. This means that the data writing process is interrupted after the process of SP4 and before the process of step SP5. At this time, the control unit 6 of the non-contact IC card 3 proceeds to step SP26, and this valid information is stored as valid data. The rewrite processing status information in the rewrite processing information storage area AR3 is rewritten so as to indicate that it is not in the middle of executing the logical / physical address rewriting processing. Thereafter, the process proceeds to an end step SP23 to end the correction processing procedure RT2. As a result, when the reader / writer device 2 instructs the controller 6 of the non-contact IC card 3 to read data from the logical address “A” thereafter, the controller 6 refers to the logical / physical address storage area AR2 accordingly. Thus, the physical address “Y” associated with the logical address “A” can be recognized, and the old data stored in the data storage area of the recognized physical address “Y” can be read.

  In this way, according to the non-contact IC card 3, even if the data writing process for writing new data is interrupted, at least the old data before executing this data writing process can be guaranteed.

(2) Operation and Effect In the above configuration, the close proximity wireless communication system 1 receives electromagnetic waves from the reader / writer device 2 that is in close proximity, generates drive power by rectifying the received electromagnetic waves, and generates the drive power using the generated drive power. It has a non-contact IC card 3 that executes data writing processing.

  In the non-volatile memory 9 of the non-contact IC card 3, physical position information (physical address) indicating the physical position of the data storage area is associated with each data storage area in which data from the reader / writer device 2 is written. A data storage area AR1. In addition, the non-volatile memory 9 of the non-contact IC card 3 includes logical position information (logical address) of the data storage area that is logically recognized by the reader / writer device 2 and physical data of the data storage area corresponding to the logical address. Valid information indicating that valid data to be read by the reader / writer device 2 is stored for the address and its data storage area or that no valid data is stored for the data storage area And a logical / physical address storage area AR2. Further, the non-volatile memory 9 of the non-contact IC card 3 is in the middle of executing a logical / physical address rewriting process for rewriting the logical / physical address storage area AR2, or in the middle of executing a logical / physical address rewriting process. The rewrite processing information storage area AR3 is stored in which rewrite processing status information representing any of the above is stored and a physical address to which the corresponding logical address is rewritten by the logical / physical address rewrite processing is saved.

  When the control unit 6 of the non-contact IC card 3 is instructed to write new data to the logical address “A” from the reader / writer device 2, the data storage corresponding to the instructed logical address “A” is performed. A data writing process for writing the new data is executed so that the new data is stored in the area.

  In other words, the control unit 6 of the non-contact IC card 3 executes the scanning process for sequentially referring to the valid information in the logical / physical address storage area AR2, thereby obtaining valid information indicating that valid data is not stored. After detection, new data is written to the data storage area of the physical address “X” associated with the detected valid information.

  Next, the control unit 6 of the non-contact IC card 3 rewrites the rewrite process status information in the rewrite process information storage area AR3 so as to indicate that the logical / physical address rewrite process is being executed, and also updates the new data. The physical address “X” of the written data storage area is saved in the rewrite processing information storage area AR3.

  Subsequently, the control unit 6 of the non-contact IC card 3 instructs the logical address associated with the physical address “X” of the data storage area in which the new data has been written from the reader / writer device 2 in the logical / physical address storage area AR2. The valid information associated with the physical address “X” is rewritten to indicate that valid data is stored.

  Then, the control unit 6 of the non-contact IC card 3 corresponds to the physical address “X” of the data storage area in which the new data is written by executing a scanning process that sequentially refers to the valid information in the logical / physical address storage area AR2. The same logical address “A” as the attached logical address “A” is detected, and the valid information associated with the detected logical address “A” is rewritten to indicate that no valid data is stored. .

  Next, the control unit 6 of the non-contact IC card 3 rewrites the rewrite process status information in the rewrite process information storage area AR3 so as to indicate that the logical / physical address rewrite process is not being executed, and then writes the data End the process.

  Thus, according to the data writing process of the non-contact IC card 3, when executing the logical / physical address rewriting process, it is only necessary to save only the physical address “X” of the data storage area where the new data is written. Therefore, compared with the conventional method, the amount of write data at the time of data write processing can be reduced, and as a result, the processing efficiency can be remarkably improved.

  In addition, when the data writing process is interrupted, the control unit 6 of the non-contact IC card 3 corrects the logical / physical address storage area AR2 so that the data that has been the target of the data writing process can be read. A correction process is executed.

  That is, when the rewrite processing status information in the rewrite processing information storage area AR3 indicates that the logical address rewrite process is being executed, the control unit 6 of the non-contact IC card 3 stores the rewrite process information storage. After recognizing the physical address “X” saved in the area AR3, the valid information associated with the physical address “X” in the logical / physical address storage area AR2 is referred to and valid in the referenced valid information. It is determined whether or not it is indicated that correct data is stored.

  Here, the control unit 6 of the non-contact IC card 3 indicates that it is not in the middle of executing the logical / physical address rewriting process when it is not indicated that valid data is stored in the referenced valid information. After the rewrite processing status information in the rewrite processing information storage area AR3 is rewritten so as to represent the correction processing, the correction processing is terminated, and it is shown that valid data is stored in the referenced valid information. In this case, the referred valid information is rewritten so as to indicate that valid data is not stored, and the logical address “A” that is the same as the logical address “A” associated with the rewritten valid information is reconstituted. It is detected from the address storage area AR2 and indicates that valid data is stored in the valid information associated with the detected logical address “A”. Determines whether or not.

  Here, the control unit 6 of the non-contact IC card 3 indicates that the valid information associated with the detected logical address “A” indicates that valid data is stored. After changing the rewrite process status information in the rewrite process information storage area AR3 so as to indicate that the rewrite process is not being executed, the correction process is terminated, and the detected logical address “A” is changed to this. When it is not indicated that valid data is stored in the associated valid information, this valid information is rewritten to indicate that valid data is stored, and then a logical-physical address rewrite process is performed. The rewrite process status information in the rewrite process information storage area AR3 is rewritten so as to indicate that the process is not being executed, and the correction process is terminated.

  Thus, according to the correction process of the non-contact IC card 3, even if the data writing process for writing new data is interrupted, at least the old data before the data writing process is executed can be guaranteed.

  According to the above configuration, even if the data writing process for writing new data is interrupted, at least the old data before executing this data writing process can be guaranteed, and the processing efficiency can be significantly improved. it can.

  Incidentally, according to the data writing process of the non-contact IC card 3, the amount of read data increases by executing the scanning process on the logical / address storage area AR2. However, in the nonvolatile memory 9 such as an EEPROM (Electrically Erasable and Programmable Read Only Memory), the processing cycle for reading data (for example, 70 [ns]) is much more remarkable than the processing cycle for writing data (for example, 10 [ms]). Since the time is short, the processing efficiency can be significantly improved by the configuration of the present embodiment.

(3) Other Embodiments In the above-described embodiments, the case where the nonvolatile memory 9 such as an EEPROM is applied as the memory into which data is written by the data writing process has been described. However, the present invention is not limited to this. First, various other storage devices such as FeRAM (Ferroelectric Random Access Memory), flash memory, and hard disk drive can be applied.

  In the above-described embodiment, the rewrite processing status information is stored in the rewrite processing information storage area AR3, and the physical address at which the corresponding logical address is rewritten by the logical / physical address rewrite processing is saved. The present invention is not limited to this, and an area for storing rewrite processing status information and an area for saving a physical address in which a corresponding logical address is rewritten by a logical / physical address rewrite process may be provided separately.

  In the above-described embodiment, the case has been described in which the control unit 6 of the non-contact IC card 3 executes the data writing processing procedure RT1, the correction processing procedure RT2, and the like in accordance with a program installed in advance. The present invention is not limited to this, and by providing a circuit for executing the data writing processing procedure RT1 and the correction processing procedure RT2 in the non-contact IC card 3, the processing procedures RT1 and RT2 are executed by hardware. You may make it do. A program for executing the data writing processing procedure RT1, the correction processing procedure RT2, and the like may be recorded on a recording medium such as a CD (Compact Disc).

  The present invention provides, for example, a non-contact IC card that executes data writing processing for receiving data transmitted from a reader / writer device that is close to the reader / writer device and writing the data to an internal memory. Etc. can be used.

It is a basic diagram which shows the structure of a near field communication system. It is a basic diagram which shows the structure of the non-contact IC card by this Embodiment. It is an approximate line figure used for explanation of data writing processing. It is an approximate line figure used for explanation of data writing processing. It is a flowchart which shows a data writing process procedure. It is a flowchart which shows a correction process procedure. It is a basic diagram with which it uses for description of the data writing process by a conventional method. It is a basic diagram with which it uses for description of the data writing process by a conventional method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Proximity wireless communication system, 2 ... Reader / writer apparatus, 3 ... Non-contact IC card, 6 ... Control part, 9 ... Nonvolatile memory, AR1 ... Data storage area, AR2 ... Logical address storage Area, AR3... Rewrite processing information storage area, RT1... Data write processing procedure, RT2.

Claims (3)

Corresponding to a data storage area in which a physical address indicating a physical position of the data storage area is associated with each data storage area to which data is written, a logical address indicating a logical position of the data storage area, and the logical address Associating the physical address of the data storage area with valid information indicating that valid data is stored in the data storage area or that no valid data is stored in the data storage area The logical / physical address storage area to be stored, and the rewrite processing status information indicating whether the logical / physical address rewriting process for rewriting the logical / physical address storage area is being executed or that the logical / physical address rewriting process is not being executed. And the physical address where the corresponding logical address is rewritten by the above-mentioned logical address rewriting process is saved. A memory and a processing information storage area,
A write processing unit for executing a data writing process for writing the data so that the data is stored in a data storage area corresponding to the logical address instructed from the outside;
With
In the above data writing process,
Valid information indicating that valid data is not stored is detected from the valid information stored in the logical / physical address storage area, and is stored in the data storage area of the physical address associated with the detected valid information. On the other hand, the data is written, the rewrite processing status information in the rewrite processing information storage area is rewritten so as to indicate that the logical / physical address rewrite processing is being executed, and the physical address of the data storage area in which the data is written is The logical address associated with the physical address of the data storage area in which the data is written is saved to the rewrite processing information storage area, and the valid information associated with the physical address is rewritten to the logical address instructed from the outside. Rewrite to indicate that valid data is stored, and store the relevant data from the above logical / physical address storage area. Detect the same logical address as the logical address associated with the address, rewrite the valid information associated with the detected logical address to indicate that no valid data is stored, and execute the above logical address rewriting process A rewrite processing status information in the rewrite processing information storage area is rewritten to indicate that it is not in the storage device. When the data writing process is interrupted, a correction processing unit that executes a correction process for correcting the logical-physical address storage area so that the data that has been the target of the data writing process can be read,
In the above correction process,
When the rewrite processing status information in the rewrite processing information storage area indicates that the logical / physical address rewrite process is being executed, the logical object is recognized after recognizing the physical address saved in the rewrite processing information storage area. Refers to valid information associated with the recognized physical address in the address storage area, determines whether or not valid data is stored in the referenced valid information, and refers to the valid information If it is not indicated that valid data is stored in the above, the correction process is performed after rewriting the rewrite process status information in the rewrite process information storage area so as to indicate that the logical / physical address rewrite process is not being executed. If the reference valid information indicates that valid data is stored, the valid information referred to is valid. Data is rewritten to indicate that the data is not stored, and the same logical address as that associated with the rewritten valid information is detected from the logical / physical address storage area and associated with the detected logical address. When it is determined whether or not valid data is stored in the associated valid information, and the fact that valid data is stored is represented in the associated valid information The rewrite processing status information in the rewrite processing information storage area is rewritten so as to indicate that the physical address rewrite processing is not being executed, and then the correction processing is terminated, and this is valid in the associated valid information. If the fact that the data is stored is not represented, the associated valid information indicates that the valid data is stored The rewrite processing status information in the rewrite processing information storage area is rewritten to indicate that the logical / physical address rewrite processing is not being executed after rewriting, and the correction processing is terminated. Storage device. Corresponding to a data storage area in which a physical address indicating a physical position of the data storage area is associated with each data storage area to which data is written, a logical address indicating a logical position of the data storage area, and the logical address Associating the physical address of the data storage area with valid information indicating that valid data is stored in the data storage area or that no valid data is stored in the data storage area The logical / physical address storage area to be stored, and the rewrite processing status information indicating whether the logical / physical address rewriting process for rewriting the logical / physical address storage area is being executed or that the logical / physical address rewriting process is not being executed. And the physical address where the corresponding logical address is rewritten by the above-mentioned logical address rewriting process is saved. A memory and a processing information storage area,
A data write processing method for a storage device, comprising: a write processing unit that executes a data write process for writing the data so that the data is stored in a data storage area corresponding to a logical address instructed from outside Because
Valid information indicating that valid data is not stored is detected from the valid information stored in the logical / physical address storage area, and is stored in the data storage area of the physical address associated with the detected valid information. On the other hand, the data is written, the rewrite processing status information in the rewrite processing information storage area is rewritten so as to indicate that the logical / physical address rewrite processing is being executed, and the physical address of the data storage area in which the data is written is The logical address associated with the physical address of the data storage area in which the data is written is saved to the rewrite processing information storage area, and the valid information associated with the physical address is rewritten to the logical address instructed from the outside. Rewrite to indicate that valid data is stored, and store the relevant data from the above logical / physical address storage area. Detect the same logical address as the logical address associated with the address, rewrite the valid information associated with the detected logical address to indicate that no valid data is stored, and execute the above logical address rewriting process A rewrite processing status information in the rewrite processing information storage area is rewritten so as to indicate that it is not in the data write processing method.

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