JPS54157045A - Memory unit - Google Patents
Memory unitInfo
- Publication number
- JPS54157045A JPS54157045A JP6542778A JP6542778A JPS54157045A JP S54157045 A JPS54157045 A JP S54157045A JP 6542778 A JP6542778 A JP 6542778A JP 6542778 A JP6542778 A JP 6542778A JP S54157045 A JPS54157045 A JP S54157045A
- Authority
- JP
- Japan
- Prior art keywords
- data
- error correction
- correction code
- read
- mode
- 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
- Detection And Correction Of Errors (AREA)
- Techniques For Improving Reliability Of Storages (AREA)
Abstract
PURPOSE: To use a memory efficiently by adding an error correction code to changed data and writing data with the error correction code added in case that the read mode is switched to the write mode.
CONSTITUTION: Data and an error correction code for correcting the error of data are stored in addresses of memory 1, and the read mode and the write mode are controlled and are switched by timing circuit 3 and are designated during the address designation period. Then, during the period when the read mode is designated, read-out data is corrected on a basis of the error correction code by error correction circuit 7, and data with the error corrected is changed by read register 8. Then, the error correction code is added to this changed data, and data with the error correction code added is written by partial write circuit 5 in case that the read mode is switched to the write mode. As a result, the memory can be used efficiently.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6542778A JPS54157045A (en) | 1978-05-31 | 1978-05-31 | Memory unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6542778A JPS54157045A (en) | 1978-05-31 | 1978-05-31 | Memory unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54157045A true JPS54157045A (en) | 1979-12-11 |
Family
ID=13286766
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6542778A Pending JPS54157045A (en) | 1978-05-31 | 1978-05-31 | Memory unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54157045A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61112245A (en) * | 1984-10-12 | 1986-05-30 | Fujitsu Ltd | Error detecting and correcting circuit |
JPS6266354A (en) * | 1985-09-18 | 1987-03-25 | Nec Corp | Storage device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5181531A (en) * | 1975-01-16 | 1976-07-16 | Fujitsu Ltd | |
JPS5298434A (en) * | 1976-02-14 | 1977-08-18 | Hitachi Ltd | Correction for memory error |
-
1978
- 1978-05-31 JP JP6542778A patent/JPS54157045A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5181531A (en) * | 1975-01-16 | 1976-07-16 | Fujitsu Ltd | |
JPS5298434A (en) * | 1976-02-14 | 1977-08-18 | Hitachi Ltd | Correction for memory error |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61112245A (en) * | 1984-10-12 | 1986-05-30 | Fujitsu Ltd | Error detecting and correcting circuit |
JPH0137770B2 (en) * | 1984-10-12 | 1989-08-09 | Fujitsu Ltd | |
JPS6266354A (en) * | 1985-09-18 | 1987-03-25 | Nec Corp | Storage device |
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