GB9415766D0 - Electronic circuits and processing systems - Google Patents

Electronic circuits and processing systems

Info

Publication number
GB9415766D0
GB9415766D0 GB9415766A GB9415766A GB9415766D0 GB 9415766 D0 GB9415766 D0 GB 9415766D0 GB 9415766 A GB9415766 A GB 9415766A GB 9415766 A GB9415766 A GB 9415766A GB 9415766 D0 GB9415766 D0 GB 9415766D0
Authority
GB
United Kingdom
Prior art keywords
processor
codes
circuit
monostables
comparators
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.)
Withdrawn
Application number
GB9415766A
Other versions
GB2282250A (en
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.)
Smiths Group PLC
Original Assignee
Smiths Group PLC
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 Smiths Group PLC filed Critical Smiths Group PLC
Publication of GB9415766D0 publication Critical patent/GB9415766D0/en
Publication of GB2282250A publication Critical patent/GB2282250A/en
Withdrawn legal-status Critical Current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
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/0796—Safety measures, i.e. ensuring safe condition in the event of error, e.g. for controlling element
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/0703—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
    • G06F11/0751—Error or fault detection not based on redundancy
    • G06F11/0754—Error or fault detection not based on redundancy by exceeding limits
    • G06F11/0757—Error or fault detection not based on redundancy by exceeding limits by exceeding a time limit, i.e. time-out, e.g. watchdogs
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/0703—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
    • G06F11/0751—Error or fault detection not based on redundancy
    • G06F11/0763—Error or fault detection not based on redundancy by bit configuration check, e.g. of formats or tags

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Hardware Redundancy (AREA)
  • Debugging And Monitoring (AREA)

Abstract

A watchdog circuit (3) for monitoring correct operation of a processor (1) and for preventing supply of a faulty output from the processor to associated apparatus (2) has a switching circuit (31) with two monostables (32 and 33) controlling a gate (30). The processor (1) supplies two codes to inputs of comparators (35 and 55), which also receive codes from hard-wired circuits (39 and 59) nominally-identical to the codes from the processor. The processor (1) has corruption circuits (41 and 51) through which the codes are alternately supplied so that the inputs to the comparators (35 and 55) differ alternately and hence their outputs alternate. The outputs from the comparators (35 and 55) are connected to the monostables (32 and 33) via a gate (34) so that the monostables keep the gate (30) open while the processor (1) is functioning correctly. The circuit may also be used with only one comparator, one hard-wired circuit etc, and then the processor only needs to supply one code (eg. 38) to the watchdog circuit. <IMAGE>
GB9415766A 1993-09-28 1994-08-04 Processor watchdog circuit. Withdrawn GB2282250A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9319974A GB9319974D0 (en) 1993-09-28 1993-09-28 Electronic circuits and processing systems

Publications (2)

Publication Number Publication Date
GB9415766D0 true GB9415766D0 (en) 1994-09-28
GB2282250A GB2282250A (en) 1995-03-29

Family

ID=10742639

Family Applications (2)

Application Number Title Priority Date Filing Date
GB9319974A Pending GB9319974D0 (en) 1993-09-28 1993-09-28 Electronic circuits and processing systems
GB9415766A Withdrawn GB2282250A (en) 1993-09-28 1994-08-04 Processor watchdog circuit.

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB9319974A Pending GB9319974D0 (en) 1993-09-28 1993-09-28 Electronic circuits and processing systems

Country Status (3)

Country Link
DE (1) DE4430177A1 (en)
FR (1) FR2710765A1 (en)
GB (2) GB9319974D0 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3210833B2 (en) * 1995-05-09 2001-09-25 株式会社日立製作所 Error checking method and device
DE19780852D2 (en) 1996-08-12 1999-11-11 Papst Motoren Gmbh & Co Kg Method and arrangement for monitoring a microprocessor
DE19847986C2 (en) * 1998-10-17 2000-10-26 Daimler Chrysler Ag Single processor system
DE10211571B4 (en) 2002-03-15 2006-03-02 Infineon Technologies Ag Device and method for monitoring a state of an electronic component, in particular a fuse
JP5246230B2 (en) * 2010-09-13 2013-07-24 株式会社デンソー Electronic control device for vehicle

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4398233A (en) * 1982-03-03 1983-08-09 Electronics Corporation Of America Fail-safe device for electronic control circuit
DE3240704A1 (en) * 1982-11-04 1984-05-10 Robert Bosch Gmbh, 7000 Stuttgart Circuit arrangement for monitoring electronic computer chips
JPS59114652A (en) * 1982-12-21 1984-07-02 Nissan Motor Co Ltd Watchdog timer circuit
GB2197508A (en) * 1986-11-03 1988-05-18 Philips Electronic Associated Data processing system with watchdog
DE3732973A1 (en) * 1987-09-30 1989-04-20 Vdo Schindling Circuit arrangement for fault monitoring of two calculation results of a microprocessor

Also Published As

Publication number Publication date
DE4430177A1 (en) 1995-03-30
GB2282250A (en) 1995-03-29
FR2710765A1 (en) 1995-04-07
GB9319974D0 (en) 1993-11-17

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)