JPS6458035A - Checking method for stored contents of memory - Google Patents

Checking method for stored contents of memory

Info

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
Application number
JP62214541A
Other languages
Japanese (ja)
Inventor
Wataru Matsumoto
Norio Kiryu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Signal Co Ltd
Original Assignee
Nippon Signal Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Signal Co Ltd filed Critical Nippon Signal Co Ltd
Priority to JP62214541A priority Critical patent/JPS6458035A/en
Publication of JPS6458035A publication Critical patent/JPS6458035A/en
Pending legal-status Critical Current

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.
JP62214541A 1987-08-28 1987-08-28 Checking method for stored contents of memory Pending JPS6458035A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6289153A (en) * 1985-10-15 1987-04-23 Hochiki Corp Storage device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6289153A (en) * 1985-10-15 1987-04-23 Hochiki Corp Storage device

Cited By (2)

* Cited by examiner, † Cited by third party
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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