JPS57179996A - Semiconductor storage device - Google Patents
Semiconductor storage deviceInfo
- Publication number
- JPS57179996A JPS57179996A JP56062424A JP6242481A JPS57179996A JP S57179996 A JPS57179996 A JP S57179996A JP 56062424 A JP56062424 A JP 56062424A JP 6242481 A JP6242481 A JP 6242481A JP S57179996 A JPS57179996 A JP S57179996A
- Authority
- JP
- Japan
- Prior art keywords
- bit
- memory cell
- information
- spare
- decoder
- 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.)
- Granted
Links
Landscapes
- Techniques For Improving Reliability Of Storages (AREA)
- For Increasing The Reliability Of Semiconductor Memories (AREA)
Abstract
PURPOSE: To constitute memories strong against the deterioration of memory cells, by providing a circuit having a spare decoder and a spare memory cell, and provide a circuit for replacing a defective memory cell with the spare memory cell.
CONSTITUTION: When an error correction signal ϕc is inputted to a memory, (1) is written in a register R1 corresponding to a row decoder selecting a memory cell reading out the error data. After a prescribed time (t1) is elapsed, an information in the R1 is written in the 1st bit S11 of a shift register SR1, an information in the S11 is shifted to a bit S12, an information of the S12 is to a bit S13, and an information of a bit S13 is shifted to a bit S14 respectively. When the content of shift registers are all at (1), if a readout data from a memory cell selected from a row decoder when one or more errors take place in a time (t1), contunues for a time 4(t1), the decoder is replaced into a spare decoder.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56062424A JPS57179996A (en) | 1981-04-27 | 1981-04-27 | Semiconductor storage device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56062424A JPS57179996A (en) | 1981-04-27 | 1981-04-27 | Semiconductor storage device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57179996A true JPS57179996A (en) | 1982-11-05 |
JPS6135639B2 JPS6135639B2 (en) | 1986-08-14 |
Family
ID=13199753
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56062424A Granted JPS57179996A (en) | 1981-04-27 | 1981-04-27 | Semiconductor storage device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57179996A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61217993A (en) * | 1985-03-22 | 1986-09-27 | Mitsubishi Electric Corp | Semiconductor memory |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5279736A (en) * | 1975-12-26 | 1977-07-05 | Hitachi Ltd | Memory error detecting control system |
JPS5384634A (en) * | 1976-12-30 | 1978-07-26 | Fujitsu Ltd | Ic memory unit device |
JPS56100A (en) * | 1979-06-15 | 1981-01-06 | Fujitsu Ltd | Semiconductor memory device |
JPS5622290A (en) * | 1979-07-27 | 1981-03-02 | Fujitsu Ltd | Failure controlling system for memory unit |
JPS5622293A (en) * | 1979-07-30 | 1981-03-02 | Fujitsu Ltd | Control system for replacement memory |
-
1981
- 1981-04-27 JP JP56062424A patent/JPS57179996A/en active Granted
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5279736A (en) * | 1975-12-26 | 1977-07-05 | Hitachi Ltd | Memory error detecting control system |
JPS5384634A (en) * | 1976-12-30 | 1978-07-26 | Fujitsu Ltd | Ic memory unit device |
JPS56100A (en) * | 1979-06-15 | 1981-01-06 | Fujitsu Ltd | Semiconductor memory device |
JPS5622290A (en) * | 1979-07-27 | 1981-03-02 | Fujitsu Ltd | Failure controlling system for memory unit |
JPS5622293A (en) * | 1979-07-30 | 1981-03-02 | Fujitsu Ltd | Control system for replacement memory |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61217993A (en) * | 1985-03-22 | 1986-09-27 | Mitsubishi Electric Corp | Semiconductor memory |
Also Published As
Publication number | Publication date |
---|---|
JPS6135639B2 (en) | 1986-08-14 |
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