JPS57161951A - Control device with memory diagnostic function - Google Patents

Control device with memory diagnostic function

Info

Publication number
JPS57161951A
JPS57161951A JP56046989A JP4698981A JPS57161951A JP S57161951 A JPS57161951 A JP S57161951A JP 56046989 A JP56046989 A JP 56046989A JP 4698981 A JP4698981 A JP 4698981A JP S57161951 A JPS57161951 A JP S57161951A
Authority
JP
Japan
Prior art keywords
rom
ram
diagnostic
accumulator
data
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
JP56046989A
Other languages
Japanese (ja)
Inventor
Motoharu Taura
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP56046989A priority Critical patent/JPS57161951A/en
Publication of JPS57161951A publication Critical patent/JPS57161951A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
    • G11C29/04—Detection or location of defective memory elements, e.g. cell constructio details, timing of test signals
    • G11C29/08—Functional testing, e.g. testing during refresh, power-on self testing [POST] or distributed testing

Landscapes

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

Abstract

PURPOSE:To diagnose a ROM, a RAM, and busses easily and quickly, by adding a self-diagnostic function to a control device. CONSTITUTION:A microprocessor discriminates the state of diagnostic selecting switches S1 and S2 and is branched to ROM and RAM diagnostic programs to diagnose a ROM and RAM. In the ROM diagnostic program, a prescribed accumulator is cleared, and data of the ROM are read out in order of address, and exclusive OR between these data and contents of the accumulator is operated, and the result is inputted to the accumulator. At the completion time of the operation for the check code of the last address, it is discriminated whether the ROM 6 is normal or not. In the RAM diagnostic program, numeric values increased successively by 1 are written to addresses of the RAM in order, and these data are read out successively to discriminate whether the RAM is normal or not.
JP56046989A 1981-03-30 1981-03-30 Control device with memory diagnostic function Pending JPS57161951A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56046989A JPS57161951A (en) 1981-03-30 1981-03-30 Control device with memory diagnostic function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56046989A JPS57161951A (en) 1981-03-30 1981-03-30 Control device with memory diagnostic function

Publications (1)

Publication Number Publication Date
JPS57161951A true JPS57161951A (en) 1982-10-05

Family

ID=12762608

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56046989A Pending JPS57161951A (en) 1981-03-30 1981-03-30 Control device with memory diagnostic function

Country Status (1)

Country Link
JP (1) JPS57161951A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS603082A (en) * 1983-06-18 1985-01-09 Dainippon Printing Co Ltd Ic card

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS603082A (en) * 1983-06-18 1985-01-09 Dainippon Printing Co Ltd Ic card
JPH053634B2 (en) * 1983-06-18 1993-01-18 Dainippon Printing Co Ltd

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