JPS5668843A - Contents diagnosis method for read-only memory - Google Patents

Contents diagnosis method for read-only memory

Info

Publication number
JPS5668843A
JPS5668843A JP14480779A JP14480779A JPS5668843A JP S5668843 A JPS5668843 A JP S5668843A JP 14480779 A JP14480779 A JP 14480779A JP 14480779 A JP14480779 A JP 14480779A JP S5668843 A JPS5668843 A JP S5668843A
Authority
JP
Japan
Prior art keywords
contents
result
rom
diagnosis method
addition
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
JP14480779A
Other languages
Japanese (ja)
Inventor
Takao Watanabe
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP14480779A priority Critical patent/JPS5668843A/en
Publication of JPS5668843A publication Critical patent/JPS5668843A/en
Pending legal-status Critical Current

Links

Landscapes

  • Test And Diagnosis Of Digital Computers (AREA)
  • Techniques For Improving Reliability Of Storages (AREA)

Abstract

PURPOSE: To obtain a high-reliability self-diagnosis method for a microprocessor, by comparing the result of addition and the result preserved previously in the ROM region at the time point when the designated byte numbers are added successively and then deciding that a change is caused to the contents of the ROM in case no coincidence is obtained.
CONSTITUTION: In the case of an addition, one byte is added successively in the order of address and in the form of the binary number of 8 bits. At the time point when the designated byte numbers are added, the result of addition is compared with the result which is preserved previously in the ROM region shown in the diagram after a calculation by on-line. If no coincidence is obtained, it is decided that a change is caused to the contents of the ROM. In such way, a high-reliability microprocessor can be obtained.
COPYRIGHT: (C)1981,JPO&Japio
JP14480779A 1979-11-08 1979-11-08 Contents diagnosis method for read-only memory Pending JPS5668843A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14480779A JPS5668843A (en) 1979-11-08 1979-11-08 Contents diagnosis method for read-only memory

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14480779A JPS5668843A (en) 1979-11-08 1979-11-08 Contents diagnosis method for read-only memory

Publications (1)

Publication Number Publication Date
JPS5668843A true JPS5668843A (en) 1981-06-09

Family

ID=15370912

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14480779A Pending JPS5668843A (en) 1979-11-08 1979-11-08 Contents diagnosis method for read-only memory

Country Status (1)

Country Link
JP (1) JPS5668843A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61846A (en) * 1984-05-28 1986-01-06 Fujitsu Ltd Test method for normalness of memory contents
JPS62249253A (en) * 1986-04-23 1987-10-30 Mitsubishi Electric Corp Diagnosis method for content of read only memory
JPH0496846A (en) * 1990-08-13 1992-03-30 Fujitsu Ltd Portable terminal device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61846A (en) * 1984-05-28 1986-01-06 Fujitsu Ltd Test method for normalness of memory contents
JPS62249253A (en) * 1986-04-23 1987-10-30 Mitsubishi Electric Corp Diagnosis method for content of read only memory
JPH0496846A (en) * 1990-08-13 1992-03-30 Fujitsu Ltd Portable terminal device

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