JPS6457498A - Partial correcting circuit for mask rom reading data - Google Patents
Partial correcting circuit for mask rom reading dataInfo
- Publication number
- JPS6457498A JPS6457498A JP21560887A JP21560887A JPS6457498A JP S6457498 A JPS6457498 A JP S6457498A JP 21560887 A JP21560887 A JP 21560887A JP 21560887 A JP21560887 A JP 21560887A JP S6457498 A JPS6457498 A JP S6457498A
- Authority
- JP
- Japan
- Prior art keywords
- mask rom
- correcting
- data
- address
- reading
- 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
- Read Only Memory (AREA)
- Stored Programmes (AREA)
- For Increasing The Reliability Of Semiconductor Memories (AREA)
Abstract
PURPOSE:To use a microprocessor unit and a mask ROM in an integrated circuit consisting of one chip by providing a switching circuit for outputting correcting data only when a reading address coincides with a correcting address. CONSTITUTION:The mask ROM 11 in which error data to be corrected is included and recorded, an address register 13 for holding a recording position in which the error data is recorded as the correcting address and a data register 14 for holding the correcting data for correcting the error data are provided. Further, a coincidence circuit 15 for generating a coincidence signal when the reading address for reading the mask ROM coincides with the correcting address and the switching circuit 17 for outputting the correcting data in place of reading data read from the mask ROM only when the coincidence signal is generated are provided. Thereby, respective circuits can be formed by incorporating all the microprocessor units and the mask ROM in the integrated circuit consisting of one chip.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21560887A JPH0770237B2 (en) | 1987-08-28 | 1987-08-28 | Partial correction circuit for mask ROM read data |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21560887A JPH0770237B2 (en) | 1987-08-28 | 1987-08-28 | Partial correction circuit for mask ROM read data |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6457498A true JPS6457498A (en) | 1989-03-03 |
JPH0770237B2 JPH0770237B2 (en) | 1995-07-31 |
Family
ID=16675243
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21560887A Expired - Lifetime JPH0770237B2 (en) | 1987-08-28 | 1987-08-28 | Partial correction circuit for mask ROM read data |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0770237B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03252997A (en) * | 1990-03-02 | 1991-11-12 | Hitachi Ltd | Semiconductor memory device |
US6954889B2 (en) | 2000-06-12 | 2005-10-11 | Matsushita Electric Industrial Co., Ltd. | Circuit for modifying stored data |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5945694A (en) * | 1982-09-06 | 1984-03-14 | Fujitsu Ltd | Modification system for rom read information |
-
1987
- 1987-08-28 JP JP21560887A patent/JPH0770237B2/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5945694A (en) * | 1982-09-06 | 1984-03-14 | Fujitsu Ltd | Modification system for rom read information |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03252997A (en) * | 1990-03-02 | 1991-11-12 | Hitachi Ltd | Semiconductor memory device |
US6954889B2 (en) | 2000-06-12 | 2005-10-11 | Matsushita Electric Industrial Co., Ltd. | Circuit for modifying stored data |
Also Published As
Publication number | Publication date |
---|---|
JPH0770237B2 (en) | 1995-07-31 |
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