GB9319974D0 - Electronic circuits and processing systems - Google Patents
Electronic circuits and processing systemsInfo
- 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
Links
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>
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)
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)
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 |
-
1993
- 1993-09-28 GB GB9319974A patent/GB9319974D0/en active Pending
-
1994
- 1994-08-04 GB GB9415766A patent/GB2282250A/en not_active Withdrawn
- 1994-08-24 FR FR9410357A patent/FR2710765A1/en active Pending
- 1994-08-25 DE DE19944430177 patent/DE4430177A1/en not_active Withdrawn
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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