JPS6458035A - Checking method for stored contents of memory - Google Patents
Checking method for stored contents of memoryInfo
- Publication number
- JPS6458035A JPS6458035A JP62214541A JP21454187A JPS6458035A JP S6458035 A JPS6458035 A JP S6458035A JP 62214541 A JP62214541 A JP 62214541A JP 21454187 A JP21454187 A JP 21454187A JP S6458035 A JPS6458035 A JP S6458035A
- Authority
- JP
- Japan
- Prior art keywords
- data
- ram
- read out
- specific pattern
- stored contents
- 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
Abstract
PURPOSE:To check with high reliability whether the stored contents of a RAM are protected or not by checking whether or not the data read out of a prescribed address of the RAM is coincident with the data on a specific pattern read out of a ROM. CONSTITUTION:When a normal power supply 11 is applied via a power supply switch 12, a reading means 132 read out the data on a specific pattern registered in a prescribed specific address of a RAM 15. A collation means 133 compares the data read out of the RAM 15 with the data on the specific pattern read out of the ROM 14, and decides whether the both are coincident or not. When the coincidence is obtained between both data, it is decided that the stored contents of the RAM 15 are protected. While the protection is not confirmed for said contents of the RAM 15 in case no coincidence is obtained between both data. Then a transfer means 134 writes the data on the specific pattern read out of the ROM 14 into a prescribed address of the RAM 15.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62214541A JPS6458035A (en) | 1987-08-28 | 1987-08-28 | Checking method for stored contents of memory |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62214541A JPS6458035A (en) | 1987-08-28 | 1987-08-28 | Checking method for stored contents of memory |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6458035A true JPS6458035A (en) | 1989-03-06 |
Family
ID=16657447
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62214541A Pending JPS6458035A (en) | 1987-08-28 | 1987-08-28 | Checking method for stored contents of memory |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6458035A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08249243A (en) * | 1995-03-10 | 1996-09-27 | Nec Corp | Information processor capable of initializing memory |
JPH11184762A (en) * | 1997-12-19 | 1999-07-09 | Unisia Jecs Corp | Device for diagnosing backup ram system of controller for automobile |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6289153A (en) * | 1985-10-15 | 1987-04-23 | Hochiki Corp | Storage device |
-
1987
- 1987-08-28 JP JP62214541A patent/JPS6458035A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6289153A (en) * | 1985-10-15 | 1987-04-23 | Hochiki Corp | Storage device |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08249243A (en) * | 1995-03-10 | 1996-09-27 | Nec Corp | Information processor capable of initializing memory |
JPH11184762A (en) * | 1997-12-19 | 1999-07-09 | Unisia Jecs Corp | Device for diagnosing backup ram system of controller for automobile |
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