Multiplexed system with watch dog timers

Details Multiplexed system with watch dog timers Multiplexed system with watch dog timers

1993-10-20

1997-06-10

Beausoliel, Jr., Robert W.

39518508, G06F 1134

Patent

active

056385102

ABSTRACT:
A multiplexed system including at least two microcomputers operable in parallel with each other, and watch dog timers. One of the watch dog timers is connected for receipt of an input signal from one of the microcomputers to check a program run-away condition in the one microcomputer. The other watch dog timer is connected for receipt of an input signal from the other microcomputer to check a program run-away condition in the other microcomputer. The one microcomputer checks the other watch dog timer, and the other microcomputer checks the one watch dog time. Calculation results are fed from the respective microcomputers to a comparator circuit which produces an output signal from the multiplexed system. When the one microcomputer checks the other watch dog timer, the input signal from the other microcomputer to the other watch dog timer is interrupted. The other watch dog timer is checked based on an operating condition of the other microcomputer. The calculation result fed from the other microcomputer to the comparator circuit is interrupted while the other watch dog timer is checked.

REFERENCES:
patent: 3681578 (1972-08-01), Stevens
patent: 4597052 (1986-06-01), Matsuda
patent: 4783778 (1988-11-01), Finch et al.
patent: 5241550 (1993-08-01), Kusano
patent: 5271023 (1993-12-01), Norman
Microcomputer Technical Q & A, Hitach Microcomputer HMCS 400 Series Application Note, 2nd edition, No. ADJ-502-024A, p. 18, (Mar. 1990) QA 4HC-054A (No translation).
Akita et al., "Fail Safe System for Railway Signalling Control", Denshi Jouhou Tsuushin Gakai Shi, vol. 73, No. 11, pp. 1203-1208, (Nov. 1990) (No translation).

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