GB9319974D0 - Electronic circuits and processing systems - Google Patents

Electronic circuits and processing systems

Info

Publication number
GB9319974D0
GB9319974D0 GB9319974A GB9319974A GB9319974D0 GB 9319974 D0 GB9319974 D0 GB 9319974D0 GB 9319974 A GB9319974 A GB 9319974A GB 9319974 A GB9319974 A GB 9319974A GB 9319974 D0 GB9319974 D0 GB 9319974D0
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.)
Pending
Application number
GB9319974A
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
Priority to GB9319974A priority Critical patent/GB9319974D0/en
Publication of GB9319974D0 publication Critical patent/GB9319974D0/en
Priority to GB9415766A priority patent/GB2282250A/en
Priority to FR9410357A priority patent/FR2710765A1/en
Priority to DE19944430177 priority patent/DE4430177A1/en
Pending legal-status Critical Current

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  • 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>
GB9319974A 1993-09-28 1993-09-28 Electronic circuits and processing systems Pending GB9319974D0 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB9319974A GB9319974D0 (en) 1993-09-28 1993-09-28 Electronic circuits and processing systems
GB9415766A GB2282250A (en) 1993-09-28 1994-08-04 Processor watchdog circuit.
FR9410357A FR2710765A1 (en) 1993-09-28 1994-08-24 Electronic circuit for monitoring a processor.
DE19944430177 DE4430177A1 (en) 1993-09-28 1994-08-25 Monitoring device for a processor

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 (1)

Publication Number Publication Date
GB9319974D0 true GB9319974D0 (en) 1993-11-17

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 After (1)

Application Number Title Priority Date Filing Date
GB9415766A Withdrawn GB2282250A (en) 1993-09-28 1994-08-04 Processor watchdog circuit.

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
US6463546B1 (en) 1996-08-12 2002-10-08 Papst-Motoren Gmbh & Co. Kg Method and apparatus 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
GB9415766D0 (en) 1994-09-28
DE4430177A1 (en) 1995-03-30
GB2282250A (en) 1995-03-29
FR2710765A1 (en) 1995-04-07

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