JPS5564689A - Abnormality detecting method for memory unit - Google Patents
Abnormality detecting method for memory unitInfo
- Publication number
- JPS5564689A JPS5564689A JP13647078A JP13647078A JPS5564689A JP S5564689 A JPS5564689 A JP S5564689A JP 13647078 A JP13647078 A JP 13647078A JP 13647078 A JP13647078 A JP 13647078A JP S5564689 A JPS5564689 A JP S5564689A
- Authority
- JP
- Japan
- Prior art keywords
- memory
- contents
- main power
- power supply
- volatile memory
- 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 make it possible to confirm whether or not memory contents retained in a memory unit are correct without increasing memory capacity, by specifying operations at the time when a main power is turned ON and OFF.
CONSTITUTION: With main power supply 1 OFF, memory address contents in a fixed area of volatile memory 4 are added together and stored at a specific address except memory addresses in volatile memory 4, and when the feeding of power of main power supply 1 starts, memory address contents in a fixed area of volatile memory 4 are added together and compared with contents stored in the specific address, so that a coincidence or dissidence signal between the both will be outputted by controller 5. Consequently, turning main power supply 1 ON addes contents in the fixed memory address area of volatile memory 4 and the sum is stored at the specific address as data for checking, and when main power supply 1 is turned ON again, power change-over circuit 3 applies the output of main power supply 1 to volatile memory 4 as a substitute for that of reversible battery 2 to add contents at memory addresses in the fixed area and the sum is compared with checking data stored at the specific address; when the both agree each other, a coincidence signal is outputted and when not a read of memory contents is interrupted.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13647078A JPS5564689A (en) | 1978-11-06 | 1978-11-06 | Abnormality detecting method for memory unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13647078A JPS5564689A (en) | 1978-11-06 | 1978-11-06 | Abnormality detecting method for memory unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5564689A true JPS5564689A (en) | 1980-05-15 |
Family
ID=15175861
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13647078A Pending JPS5564689A (en) | 1978-11-06 | 1978-11-06 | Abnormality detecting method for memory unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5564689A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS593796A (en) * | 1982-06-29 | 1984-01-10 | Shinko Electric Co Ltd | Checking method of data in memory |
JPS59140699A (en) * | 1983-01-31 | 1984-08-13 | Fujitsu Ltd | Checking system of memory contents |
JPS59178699A (en) * | 1983-03-29 | 1984-10-09 | Shimadzu Corp | Data processing device |
JPS605363A (en) * | 1983-06-22 | 1985-01-11 | Sharp Corp | Confirmation system for memory contents |
JP2012166073A (en) * | 2012-06-11 | 2012-09-06 | Sophia Co Ltd | Game machine |
-
1978
- 1978-11-06 JP JP13647078A patent/JPS5564689A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS593796A (en) * | 1982-06-29 | 1984-01-10 | Shinko Electric Co Ltd | Checking method of data in memory |
JPS59140699A (en) * | 1983-01-31 | 1984-08-13 | Fujitsu Ltd | Checking system of memory contents |
JPS59178699A (en) * | 1983-03-29 | 1984-10-09 | Shimadzu Corp | Data processing device |
JPS605363A (en) * | 1983-06-22 | 1985-01-11 | Sharp Corp | Confirmation system for memory contents |
JP2012166073A (en) * | 2012-06-11 | 2012-09-06 | Sophia Co Ltd | Game machine |
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