JPS5562593A - Memory device - Google Patents
Memory deviceInfo
- Publication number
- JPS5562593A JPS5562593A JP13343378A JP13343378A JPS5562593A JP S5562593 A JPS5562593 A JP S5562593A JP 13343378 A JP13343378 A JP 13343378A JP 13343378 A JP13343378 A JP 13343378A JP S5562593 A JPS5562593 A JP S5562593A
- Authority
- JP
- Japan
- Prior art keywords
- chips
- defective
- regions
- data
- information
- 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 relieve defective memory chips by substituting the defective region of a defective memory chip by the complete region of a relief memory chip.
CONSTITUTION: Defective memory chips 1W4 are so combined that defective regions may be prevented from overlapping mutually. A memory chip where regions corresponding to defective regions of chips 1W4 are complete is used as relief memory chip 5. Defect pattern information a1Wa4 corresponding to defect patterns of chips 1W4 are stored in ROM8 previously. In data write to these chips 1W5, information a1Wa4 are read out from ROM8; and when write data W.D is given to chips 1W4, some of AND gates 10W13 to which logical "1" indicating defect of information a1W a2 is given are opened, and data for defective regions is written in chip 5. Meanwhile, in data read from chips 1W5, data corresponding to defective regions of chips 1W4 are read out from corresponding regions of chip 5 on a basis of information a1Wan.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13343378A JPS5562593A (en) | 1978-10-30 | 1978-10-30 | Memory device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13343378A JPS5562593A (en) | 1978-10-30 | 1978-10-30 | Memory device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5562593A true JPS5562593A (en) | 1980-05-12 |
Family
ID=15104652
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13343378A Pending JPS5562593A (en) | 1978-10-30 | 1978-10-30 | Memory device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5562593A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61198348A (en) * | 1985-02-28 | 1986-09-02 | Nec Corp | Memory package |
JPS6240700A (en) * | 1985-08-17 | 1987-02-21 | Sanyo Electric Co Ltd | Semiconductor memory |
-
1978
- 1978-10-30 JP JP13343378A patent/JPS5562593A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61198348A (en) * | 1985-02-28 | 1986-09-02 | Nec Corp | Memory package |
JPS6240700A (en) * | 1985-08-17 | 1987-02-21 | Sanyo Electric Co Ltd | Semiconductor memory |
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