JPS54125932A - Protective device for memory unit - Google Patents
Protective device for memory unitInfo
- Publication number
- JPS54125932A JPS54125932A JP3386578A JP3386578A JPS54125932A JP S54125932 A JPS54125932 A JP S54125932A JP 3386578 A JP3386578 A JP 3386578A JP 3386578 A JP3386578 A JP 3386578A JP S54125932 A JPS54125932 A JP S54125932A
- Authority
- JP
- Japan
- Prior art keywords
- unit
- time
- memory unit
- power supply
- circuit
- 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
- Power Sources (AREA)
- Techniques For Improving Reliability Of Storages (AREA)
Abstract
PURPOSE: To prevent the breakdown of the contents of the memory unit when the main power supply is cut off by controlling the power supply ON and OFF of the peripheral circuit groups via the 1st control circuit and also controlling the capability and incapability of the writing to the memory unit via the 2nd control circuit.
CONSTITUTION: Output signal 50 of 1st control circuit 3 is connected so as to control the ON and OFF of power switch 5 of peripheral circuit group 6; while output signal 51 of 2nd control circuit 4 is connected to control the writing capability and incapability for memory unit 7 respectively. In this case, the power supply of unit 7 is always connected. When main power switch 2 is turned on at time t1, circuit 3 operates at time t2 after a fixed time. Thus, signal 50 becomes H, and switch 5 is turned on to supply power 1 to unit 6. And it takes sometime to give the correct operation to unit 6 after connection of the power supply, so circuit 4 operates at time t3 after a fixed time from the correct operation of unit 6 in order to set signal 51 at H. Thus, the system is put under the correct using state after time t3.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA313,747A CA1113407A (en) | 1977-10-19 | 1977-10-19 | Stationary record player |
JP3386578A JPS54125932A (en) | 1978-03-23 | 1978-03-23 | Protective device for memory unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3386578A JPS54125932A (en) | 1978-03-23 | 1978-03-23 | Protective device for memory unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54125932A true JPS54125932A (en) | 1979-09-29 |
Family
ID=12398385
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3386578A Pending JPS54125932A (en) | 1977-10-19 | 1978-03-23 | Protective device for memory unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54125932A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57138098A (en) * | 1981-02-19 | 1982-08-26 | Fuji Electric Co Ltd | Mis-write preventing circuit in main power supply failure |
JPS6044141U (en) * | 1983-08-30 | 1985-03-28 | 株式会社山武 | Power outage detection memory backup device |
JPS63181017A (en) * | 1987-01-22 | 1988-07-26 | Matsushita Electric Ind Co Ltd | Data backup device |
US5691947A (en) * | 1992-12-18 | 1997-11-25 | Motorola Inc. | Multiplexed programming voltage and status over single conductor |
-
1978
- 1978-03-23 JP JP3386578A patent/JPS54125932A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57138098A (en) * | 1981-02-19 | 1982-08-26 | Fuji Electric Co Ltd | Mis-write preventing circuit in main power supply failure |
JPS6044141U (en) * | 1983-08-30 | 1985-03-28 | 株式会社山武 | Power outage detection memory backup device |
JPS63181017A (en) * | 1987-01-22 | 1988-07-26 | Matsushita Electric Ind Co Ltd | Data backup device |
US5691947A (en) * | 1992-12-18 | 1997-11-25 | Motorola Inc. | Multiplexed programming voltage and status over single conductor |
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