JPS63198185A - Memory area defining system for portable electronic equipment - Google Patents

Abstract

PURPOSE:To prevent plural areas from being defined with duplication by recognizing the legality of the respective areas and defining and storing the leading address and the area size of the respective areas in a directory area as a bit of respective area definition information only at the time of being legal. CONSTITUTION:An IC card 11 for defining the area is set to a card reader/ writer 12, the area definition information, namely, an area number, the leading address and the area size of the area are sequentially inputted from a keyboard 13 and temporarily stored in a floppy disk device 15. Then, this area definition information is sequentially fed to the IC card 11 at every area and temporarily stored in an incorporated RAM. Then, a control element 1 sequentially checks the area definition information at every area, decides that all the areas are legal, and then sequentially writes the respective area definition information in the RAM in the directory area of a data memory 2. Thereby, the plural areas can be prevented from being defined with the duplication.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial Field of Application)
In a portable electronic device called an IC card, which has a built-in IC (integrated circuit) chip having a control element such as tJ, a memory area definition of the portable electronic device that divides and defines the data memory into a plurality of areas. Regarding the method.

(Prior Art) Recently, an IC card has been developed as a new portable data storage medium, which has a built-in IC chip that has a non-volatile data memory and a control element such as an 02 port. The built-in control element accesses the built-in data memory and inputs and outputs necessary data in response to requests from external devices.

Incidentally, in such an IG card, the data memory is defined as being divided into a plurality of areas, and these areas are used as an access unit.

In this way, the data memory is divided and defined into a plurality of areas, and the memory areas are usually defined by the card issuer when the IC card is issued, and conventionally this has been done in the following manner.

That is, by inputting the start address (start position information) and area size of each area as area definition information, and storing these area definition information in a table format in a specific area of the data memory, the start address and area size of each area can be input. Areas are divided and defined and managed according to size.

However, in the conventional memory area definition method, the input area definition information is sequentially stored in a specific area of the data memory, and the area definition ends when all the area definition information has been stored, and the area definition information is checked. Because this was not done, there was a risk that multiple areas would be defined redundantly.

<Problems to be Solved by the Invention> The present invention has been made to solve the above-mentioned problem that multiple areas may be defined overlappingly. An object of the present invention is to provide a memory area definition method for a portable electronic device that can prevent the definition from occurring.

[Structure of the Invention] (Means for Solving the Problems) The present invention has a data memory section and a control section for reading and writing data to the data memory section, and selectively controls external A memory area definition method for a portable electronic device that performs input/output from a portable electronic device, in which the data memory section is defined as being divided into a plurality of areas based on starting position information and area size of each area, wherein each area The validity of each area is confirmed based on the head position information and area size of each area, and only when the area is valid, the head position information and area size of each area are defined and stored as each area definition information.

(Function) By checking the validity of each area based on the start position information and area size of each area, and only when it is valid, defining and storing the start position information and area size of each area as each area definition information, multiple It is possible to prevent areas from being defined redundantly.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 4 shows an example of the configuration of an IC card as a portable electronic device according to the present invention, in which a control element (
For example, a CPU) 1, a nonvolatile data memory 2 whose storage contents can be erased as a data memory section, a program memory 3 as a program memory section, and a contact section 4 for establishing electrical contact with a card reader/writer.
The part within the dashed line (
The control element 1, data memory 2, program memory 3) is composed of one IC chip and is embedded within the IC card body. The program memory 3 stores, for example, a mask R.
It is composed of an OM and stores a control program for the control element 1, which includes subroutines for realizing each basic function. The data memory 2 is used to store various data, and is composed of, for example, an EEPROM.

The data memory 2 includes, for example, an issue flag area 21, a directory area 22, and a data area (user area) 23, as shown in FIG. 2(a). The publication flag area 21 is the directory area 2.
It is used as an issuance flag for determining whether writing of No. 2 has been completed. Directory area 22
is an area in which the data area 23 is divided into a plurality of areas and managed, and area definition information is stored therein as will be described later. The data area 23 stores various data, and is divided into a plurality of areas as described later.

FIG. 3 shows an example of the configuration of an IC card issuing device according to the present invention, in which a card reader/card reader that accepts the IC card 11 configured as described above and reads and writes data to the IC card 11 is shown. A writer 12, a keyboard 13 for inputting area definition information, etc., a CRT display device 14 for displaying input information, etc., a floppy disk device 15 used for temporary storage of inputted area definition information, etc., a printer 16, and controls these. C.P.
It is constituted by a control section 17 consisting of a U, etc.

Next, the memory area definition method of the present invention in such a configuration will be explained in detail. First, the IC card 11 for area definition is set in the card reader/writer 12. Next, area definition information, that is, area number, area start address, and area size, are input in sequence from the keyboard 13 and are temporarily stored in the floppy disk device 15 under the control of the control section 17. thus,
After entering all the area definition information, the keyboard 13
By inputting an area definition start command from , the control unit 17 sends area definition information input command data to the IC card 11, and then sequentially sends the area definition information in the floppy disk device 15 to the IC card 11 for each area. send.

The IC card 11 operates according to the flowchart shown in FIG. That is, when the control element 1 receives the area definition information input command data, it sequentially receives the area definition information sent subsequently, that is, the area number, the start address of the area, and the area size, and temporarily stores them in the built-in RAM. Then, when all the area definition information is accepted, the control element 1 enters a state of waiting for issued command data. In this state, when issue command data is input from the card reader/writer 12, the control element 1 confirms the validity of each area based on the area definition information in the RAM. That is, when the control unit 17 finishes transferring all the area definition information in the floppy disk device 15 to the IC card 11,
Issue command data is sent to the IC card 11. Upon receiving the issue command data, control element 1 subtracts the start address (A) of the target area from the start address (A+1>) of the area defined next to the target area, based on the area definition information in the RAM. Then, calculate the size of the target area. Then, use this calculated area size as R.
Compare the size of the target area in AM, and if both area sizes match or the calculated area size is larger, it is judged to be legitimate, and the calculated area size is larger. If it is small, it is invalid (duplicate definition of area)
It is determined that If it is determined that the area definition error is incorrect, the control element 1 sends response data indicating an area definition error to the control unit 17 via the card reader/writer 12, and ends the area definition operation. When the control unit 17 receives the response data indicating an area definition error, it displays this on the CRT display device 14 and notifies the operator.

If it is determined to be valid, the control element 15 checks the next area in the same manner as above. In this way, the area definition information is sequentially checked for each area, and when it is determined that all areas are valid, the control element 1 sequentially writes each area definition information in the RAM into the directory area 22 of the data memory 2. When all the area definition information is written, the control element 1 sets the issue flag (stores the directory area written data in the issue flag area 21 of the data memory 2), and sends a response indicating area definition #incomplete. is sent to the control unit 17 via the card reader/writer 12, and the area definition operation is completed. This completes the area definition, and as a result, the directory area 22 of the data memory 2 is in a state where area definition information is stored, for example, as shown in FIG. 2(b), and the data area 23 is Defined divided into multiple areas.

In this way, before storing the definition in the directory area,
The validity of each area is confirmed by the start address and area size of each area, and only when it is valid, the start address and area size of each area are defined and stored in the directory area as each area definition information. Duplicate definitions can be prevented.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a memory area definition method for a portable electronic device that can prevent multiple areas from being defined redundantly.

[Brief explanation of the drawing]

The figures are for explaining one embodiment of the present invention, and FIG. 1 is a flow chart explaining the area definition operation of the IC card, FIG. 2 (a) is a configuration diagram of the data memory, and FIG. 2 (1)
3 is a block diagram showing the configuration of the IC card issuing device, and FIG. 4 is a block diagram showing the configuration of the IC card. 1... Control element (control unit), 2... Data memory (data memory section), 3... Program memory (program memory section), 21...・
Issue flag area, 22... Directory area, 23... Data area, 11...
IC card (portable electronic device), 12... Card reader/writer, 13... Keyboard, 1
7...Control unit. Applicant's agent Patent attorney Takehiko Suzue Figure 1 (a) Figure 1 (b) Figure 2 (a) Area number Figure 2 (b)

Claims (6)

[Claims] (1) In a portable electronic device that has a data memory section and a control section for reading and writing data to the data memory section, and selectively performs input/output from the outside; A memory area definition method for a portable electronic device that divides and defines a plurality of areas into a plurality of areas based on the start position information and area size of each area; the validity of each area is confirmed based on the start position information and area size of each area. A memory area definition method for a portable electronic device, characterized in that the head position information and area size of each area are defined and stored as each area definition information only when valid. (2) The memory area definition method for a portable electronic device according to claim 1, wherein the confirmation of validity is a confirmation of whether or not each area overlaps. (3) To confirm the validity, calculate the size of the target area from the start position information of the target area and the start position information of the next area, and compare it with the input target area size. A memory area definition method for a portable electronic device according to claim 1, characterized in that the method is performed by: (4) The memory area definition method for a portable electronic device according to claim 1, wherein the area start position information is an area start address. (5) The memory area definition method for a portable electronic device according to claim 1, wherein the data memory section is a nonvolatile memory. (6) The memory area definition method for a portable electronic device according to claim 1, wherein the portable electronic device is an IC card.