JPS56166639A - Logical circuit having self-checking function - Google Patents

Logical circuit having self-checking function

Info

Publication number
JPS56166639A
JPS56166639A JP7054080A JP7054080A JPS56166639A JP S56166639 A JPS56166639 A JP S56166639A JP 7054080 A JP7054080 A JP 7054080A JP 7054080 A JP7054080 A JP 7054080A JP S56166639 A JPS56166639 A JP S56166639A
Authority
JP
Japan
Prior art keywords
circuit
logical
output
logical circuit
outputs
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
JP7054080A
Other languages
Japanese (ja)
Inventor
Masato Kawai
Shigehiro Kouzu
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP7054080A priority Critical patent/JPS56166639A/en
Publication of JPS56166639A publication Critical patent/JPS56166639A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28—Testing of electronic circuits, e.g. by signal tracer
    • G01R31/317—Testing of digital circuits
    • G01R31/3181—Functional testing
    • G01R31/3185—Reconfiguring for testing, e.g. LSSD, partitioning
    • G01R31/318533—Reconfiguring for testing, e.g. LSSD, partitioning using scanning techniques, e.g. LSSD, Boundary Scan, JTAG
    • G01R31/318569—Error indication, logging circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Tests Of Electronic Circuits (AREA)
  • Logic Circuits (AREA)

Abstract

PURPOSE:To detect a fault in a logical circuit through an output terminal by itself, by constituting a circuit which check the fault in the circuit by using logical values present in the logical circuit. CONSTITUTION:A logical circuit 10 is an optical logical circuit used to a operate an original circuit, and two FFs 11 and 12 constitute some part of the circuit 10. To respective positive outputs and negative outputs of the FFs 11 and 12, OR circuits 13 and 14 are connected exclusively and outputs of circuits 13 and 14 are ''1''s invariably. Therefore, the logical value of an output terminal 16 is a ''1'' according to the output of an AND circuit 15. If either one of the positive and negative outputs of the FFs 11 and 12 is troubled, the output of the circuit 13 or 14 goes to a ''0'', and the output of the terminal also goes to a ''0''. Consequently, a fault in the circuit is detected automatically via the terminal 16.
JP7054080A 1980-05-26 1980-05-26 Logical circuit having self-checking function Pending JPS56166639A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7054080A JPS56166639A (en) 1980-05-26 1980-05-26 Logical circuit having self-checking function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7054080A JPS56166639A (en) 1980-05-26 1980-05-26 Logical circuit having self-checking function

Publications (1)

Publication Number Publication Date
JPS56166639A true JPS56166639A (en) 1981-12-21

Family

ID=13434452

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7054080A Pending JPS56166639A (en) 1980-05-26 1980-05-26 Logical circuit having self-checking function

Country Status (1)

Country Link
JP (1) JPS56166639A (en)

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