JPS567295A - Semiconductor memory unit - Google Patents
Semiconductor memory unitInfo
- Publication number
- JPS567295A JPS567295A JP8002679A JP8002679A JPS567295A JP S567295 A JPS567295 A JP S567295A JP 8002679 A JP8002679 A JP 8002679A JP 8002679 A JP8002679 A JP 8002679A JP S567295 A JPS567295 A JP S567295A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- program
- bus
- output
- given
- 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
- Read Only Memory (AREA)
Abstract
PURPOSE: To make it possible to write data under the state where the P-ROM is connected to the system, by using the memory program board connected to the computer system through a bus.
CONSTITUTION: Control circuit CS outputs program control signal PRGP and busy signal B, which indicates to control signal bus C-BUS of the CPU system that memory access is being executed, by turning-on of switch SW, which is provided on memory program board PB, and the write cycle of read/write signal R/W. The request to hold the address and data to be programmed is output in the course of output of signal B, and next, signal PRGP is output and is given to the base of switching transistor TR, and the program voltage given to terminal PT is switched and is given to a prescribed terminal of P-ROM1, 2. Select signals SEL1 and SEL2 are kept in the program state for a proper time to write data to the pertinent P-ROM.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8002679A JPS567295A (en) | 1979-06-25 | 1979-06-25 | Semiconductor memory unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8002679A JPS567295A (en) | 1979-06-25 | 1979-06-25 | Semiconductor memory unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS567295A true JPS567295A (en) | 1981-01-24 |
Family
ID=13706760
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8002679A Pending JPS567295A (en) | 1979-06-25 | 1979-06-25 | Semiconductor memory unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS567295A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5823392A (en) * | 1981-08-03 | 1983-02-12 | Hiroshi Osuji | Write system for rom writer |
US5602738A (en) * | 1990-02-01 | 1997-02-11 | Hitachi, Ltd. | Control apparatus for automobile engine including microcomputer which may be programmed after mounting on a circuit board |
-
1979
- 1979-06-25 JP JP8002679A patent/JPS567295A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5823392A (en) * | 1981-08-03 | 1983-02-12 | Hiroshi Osuji | Write system for rom writer |
JPS6059673B2 (en) * | 1981-08-03 | 1985-12-26 | 広 大條 | ROM writer writing method |
US5602738A (en) * | 1990-02-01 | 1997-02-11 | Hitachi, Ltd. | Control apparatus for automobile engine including microcomputer which may be programmed after mounting on a circuit board |
US5787381A (en) * | 1990-02-01 | 1998-07-28 | Hitachi, Ltd. | Control apparatus for automobile engine including microcomputer which may be programmed after mounting on a circuit board |
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