JPS551607A - Read data correction system of mask read-only memory - Google Patents
Read data correction system of mask read-only memoryInfo
- Publication number
- JPS551607A JPS551607A JP7222078A JP7222078A JPS551607A JP S551607 A JPS551607 A JP S551607A JP 7222078 A JP7222078 A JP 7222078A JP 7222078 A JP7222078 A JP 7222078A JP S551607 A JPS551607 A JP S551607A
- Authority
- JP
- Japan
- Prior art keywords
- program
- mask
- read
- rom
- read data
- 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
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C17/00—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards
- G11C17/08—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards using semiconductor devices, e.g. bipolar elements
Landscapes
- Static Random-Access Memory (AREA)
- For Increasing The Reliability Of Semiconductor Memories (AREA)
- Techniques For Improving Reliability Of Storages (AREA)
- Read Only Memory (AREA)
Abstract
PURPOSE:To correct simply read data of a mask program ROM by combining program logic arrays and encode program ROMs. CONSTITUTION:Program logic arrays 11-1... inhibit the read of mask program ROM 1 through OR circuit 13 according to input address signals and generate the second address signal to address corresponding encode program ROM 12-1..., and correction data dependent upon ROM 12-1... is generated. Consequently, read data of the mask program ROM where specifications are changed can be corrected in a simple constitution, where many wirings, etc., are needless, by combining writable program logic arrays and encode program ROMs.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7222078A JPS551607A (en) | 1978-06-16 | 1978-06-16 | Read data correction system of mask read-only memory |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7222078A JPS551607A (en) | 1978-06-16 | 1978-06-16 | Read data correction system of mask read-only memory |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS551607A true JPS551607A (en) | 1980-01-08 |
Family
ID=13482938
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7222078A Pending JPS551607A (en) | 1978-06-16 | 1978-06-16 | Read data correction system of mask read-only memory |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS551607A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57207949A (en) * | 1981-06-17 | 1982-12-20 | Tokyo Electric Co Ltd | Memory controller |
JPS595497A (en) * | 1982-07-02 | 1984-01-12 | Hitachi Ltd | Semiconductor rom |
JPS5985545A (en) * | 1982-11-09 | 1984-05-17 | Fujitsu Ltd | Correcting and processing system for contents of system rom |
JPS59135600U (en) * | 1983-02-25 | 1984-09-10 | 株式会社アドバンテスト | Electronic equipment with rewritable non-volatile memory |
JPS59185099A (en) * | 1984-02-28 | 1984-10-20 | Toshiba Corp | Nonvolatile semiconductor memory |
JPS61230699A (en) * | 1985-04-05 | 1986-10-14 | Nippon Denki Kanji Syst Kk | Storage system |
JPS6234399A (en) * | 1985-08-07 | 1987-02-14 | Sony Corp | Memory element and its using method |
JPH0296699U (en) * | 1989-01-20 | 1990-08-01 |
-
1978
- 1978-06-16 JP JP7222078A patent/JPS551607A/en active Pending
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57207949A (en) * | 1981-06-17 | 1982-12-20 | Tokyo Electric Co Ltd | Memory controller |
JPS595497A (en) * | 1982-07-02 | 1984-01-12 | Hitachi Ltd | Semiconductor rom |
JPS5985545A (en) * | 1982-11-09 | 1984-05-17 | Fujitsu Ltd | Correcting and processing system for contents of system rom |
JPS59135600U (en) * | 1983-02-25 | 1984-09-10 | 株式会社アドバンテスト | Electronic equipment with rewritable non-volatile memory |
JPS59185099A (en) * | 1984-02-28 | 1984-10-20 | Toshiba Corp | Nonvolatile semiconductor memory |
JPS6240797B2 (en) * | 1984-02-28 | 1987-08-31 | Tokyo Shibaura Electric Co | |
JPS61230699A (en) * | 1985-04-05 | 1986-10-14 | Nippon Denki Kanji Syst Kk | Storage system |
JPS6234399A (en) * | 1985-08-07 | 1987-02-14 | Sony Corp | Memory element and its using method |
JPH0296699U (en) * | 1989-01-20 | 1990-08-01 |
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