JPS5542343A - Control system for memory unit - Google Patents
Control system for memory unitInfo
- Publication number
- JPS5542343A JPS5542343A JP11499778A JP11499778A JPS5542343A JP S5542343 A JPS5542343 A JP S5542343A JP 11499778 A JP11499778 A JP 11499778A JP 11499778 A JP11499778 A JP 11499778A JP S5542343 A JPS5542343 A JP S5542343A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- error
- data
- bit
- memory unit
- 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
- Techniques For Improving Reliability Of Storages (AREA)
Abstract
PURPOSE: To make it possible to detect bit positions of a multibit error through software or only by adding a few circuits.
CONSTITUTION: Once error correction circuit ECC38 generates signal UNCOR15 indicating an uncorrectable error, operation signal GO16, operation mode signal OPC17 and write data DIN18 are supplied to a memory unit. Then, OPC17 assigns write operation and DIN18 generates known data such as all-"1" data. After the write operation, GO19 and OPC20 are generated again. Then, OPC20 assigns read operation and read data 14b is obtained. A bit-by-bit comparison between this read data 14b and known data 18 and a check are made and its result is generated as comparison error signal COMPE21. Therefore, error bit positions are discriminated by this signal and the detection becomes possible.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11499778A JPS5542343A (en) | 1978-09-19 | 1978-09-19 | Control system for memory unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11499778A JPS5542343A (en) | 1978-09-19 | 1978-09-19 | Control system for memory unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5542343A true JPS5542343A (en) | 1980-03-25 |
Family
ID=14651740
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11499778A Pending JPS5542343A (en) | 1978-09-19 | 1978-09-19 | Control system for memory unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5542343A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60173647A (en) * | 1984-02-17 | 1985-09-07 | Fujitsu Ltd | Detecting system of error generating part of information processing unit |
-
1978
- 1978-09-19 JP JP11499778A patent/JPS5542343A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60173647A (en) * | 1984-02-17 | 1985-09-07 | Fujitsu Ltd | Detecting system of error generating part of information processing unit |
JPH0377546B2 (en) * | 1984-02-17 | 1991-12-10 | Fujitsu Ltd |
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