JPS649583A - Data processing system by ic card - Google Patents
Data processing system by ic cardInfo
- Publication number
- JPS649583A JPS649583A JP62166053A JP16605387A JPS649583A JP S649583 A JPS649583 A JP S649583A JP 62166053 A JP62166053 A JP 62166053A JP 16605387 A JP16605387 A JP 16605387A JP S649583 A JPS649583 A JP S649583A
- Authority
- JP
- Japan
- Prior art keywords
- data
- memory access
- card
- normal
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE:To reduce the access time by parallel accessing and to improve the reliability of system by installing two systems of RAMs onto an IC card and writing same data therein. CONSTITUTION:The IC card 10 is provided with 1st and 2nd random access memories RAMs 12, 13 and terminal groups 14, 15 connecting to them respectively. The data processing unit is provided with 1st and 2nd memory access circuits 21, 22, 1st and 2nd contact groups 23, 24 and a control circuit 27, and in writing the data, the control circuit 27 writes the same write data to both the 1st memory access circuit 21 and the 2nd memory access circuit 22 and in case of data readout, the data is read from one memory access circuit and when it is normal, the result is processed as readout data and when not normal, the data read by the other memory access circuit is checked and when it is normal, the result is processed as the readout data. Thus, the reliability of the entire system is improved remarkably.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62166053A JPS649583A (en) | 1987-07-02 | 1987-07-02 | Data processing system by ic card |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62166053A JPS649583A (en) | 1987-07-02 | 1987-07-02 | Data processing system by ic card |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS649583A true JPS649583A (en) | 1989-01-12 |
Family
ID=15824090
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62166053A Pending JPS649583A (en) | 1987-07-02 | 1987-07-02 | Data processing system by ic card |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS649583A (en) |
-
1987
- 1987-07-02 JP JP62166053A patent/JPS649583A/en active Pending
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