JPS5668843A - Contents diagnosis method for read-only memory - Google Patents
Contents diagnosis method for read-only memoryInfo
- Publication number
- JPS5668843A JPS5668843A JP14480779A JP14480779A JPS5668843A JP S5668843 A JPS5668843 A JP S5668843A JP 14480779 A JP14480779 A JP 14480779A JP 14480779 A JP14480779 A JP 14480779A JP S5668843 A JPS5668843 A JP S5668843A
- Authority
- JP
- Japan
- Prior art keywords
- contents
- result
- rom
- diagnosis method
- addition
- 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
Landscapes
- Test And Diagnosis Of Digital Computers (AREA)
- Techniques For Improving Reliability Of Storages (AREA)
Abstract
PURPOSE: To obtain a high-reliability self-diagnosis method for a microprocessor, by comparing the result of addition and the result preserved previously in the ROM region at the time point when the designated byte numbers are added successively and then deciding that a change is caused to the contents of the ROM in case no coincidence is obtained.
CONSTITUTION: In the case of an addition, one byte is added successively in the order of address and in the form of the binary number of 8 bits. At the time point when the designated byte numbers are added, the result of addition is compared with the result which is preserved previously in the ROM region shown in the diagram after a calculation by on-line. If no coincidence is obtained, it is decided that a change is caused to the contents of the ROM. In such way, a high-reliability microprocessor can be obtained.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14480779A JPS5668843A (en) | 1979-11-08 | 1979-11-08 | Contents diagnosis method for read-only memory |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14480779A JPS5668843A (en) | 1979-11-08 | 1979-11-08 | Contents diagnosis method for read-only memory |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5668843A true JPS5668843A (en) | 1981-06-09 |
Family
ID=15370912
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14480779A Pending JPS5668843A (en) | 1979-11-08 | 1979-11-08 | Contents diagnosis method for read-only memory |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5668843A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61846A (en) * | 1984-05-28 | 1986-01-06 | Fujitsu Ltd | Test method for normalness of memory contents |
JPS62249253A (en) * | 1986-04-23 | 1987-10-30 | Mitsubishi Electric Corp | Diagnosis method for content of read only memory |
JPH0496846A (en) * | 1990-08-13 | 1992-03-30 | Fujitsu Ltd | Portable terminal device |
-
1979
- 1979-11-08 JP JP14480779A patent/JPS5668843A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61846A (en) * | 1984-05-28 | 1986-01-06 | Fujitsu Ltd | Test method for normalness of memory contents |
JPS62249253A (en) * | 1986-04-23 | 1987-10-30 | Mitsubishi Electric Corp | Diagnosis method for content of read only memory |
JPH0496846A (en) * | 1990-08-13 | 1992-03-30 | Fujitsu Ltd | Portable terminal device |
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