JPS57143645A - Diagnostic system for error detecting circuit - Google Patents

Diagnostic system for error detecting circuit

Info

Publication number
JPS57143645A
JPS57143645A JP56028473A JP2847381A JPS57143645A JP S57143645 A JPS57143645 A JP S57143645A JP 56028473 A JP56028473 A JP 56028473A JP 2847381 A JP2847381 A JP 2847381A JP S57143645 A JPS57143645 A JP S57143645A
Authority
JP
Japan
Prior art keywords
lsi2
fdd1
data
error detecting
detecting circuit
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
JP56028473A
Other languages
Japanese (ja)
Inventor
Masanori Taketomi
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP56028473A priority Critical patent/JPS57143645A/en
Publication of JPS57143645A publication Critical patent/JPS57143645A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/22—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing
    • G06F11/2205—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing using arrangements specific to the hardware being tested
    • G06F11/2215—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing using arrangements specific to the hardware being tested to test error correction or detection circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Detection And Correction Of Errors (AREA)

Abstract

PURPOSE:To diagnose an error detecting circuit easily with a low cost, by inputting normal data from an external device and changing this data for a constant time to diagnose the error detecting circuit. CONSTITUTION:When an FF8 which indicates the diagnostic operation is set by a control part 11 and data is read from a floppy-disc driving FDD1 to an LSI2 for floppy-disc control, a transfer request is generated from the LSI2 to set an FF10. An output O of the FF10 becomes low, and the input of separate data from the FDD1 to the LSI2 is inhibited by a gate 5. Next, when an FF9 is set and the FF8 is reset and a separate clock is inputted from the FDD1, the FF10 is reset through a gate 7, and the inhibition of the gate 5 is released to input data from the FDD1 to the LSI2. By this action, normal data has one bit dropped out and is inputted to the LSI2 from the FDD1, and the LSI2 reports a CRC error, thus diagnosing the error detecting function.
JP56028473A 1981-03-02 1981-03-02 Diagnostic system for error detecting circuit Pending JPS57143645A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56028473A JPS57143645A (en) 1981-03-02 1981-03-02 Diagnostic system for error detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56028473A JPS57143645A (en) 1981-03-02 1981-03-02 Diagnostic system for error detecting circuit

Publications (1)

Publication Number Publication Date
JPS57143645A true JPS57143645A (en) 1982-09-04

Family

ID=12249611

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56028473A Pending JPS57143645A (en) 1981-03-02 1981-03-02 Diagnostic system for error detecting circuit

Country Status (1)

Country Link
JP (1) JPS57143645A (en)

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