Excavating
Patent
1982-05-17
1984-12-11
Smith, Jerry
Excavating
371 12, H03K 1700
Patent
active
044883030
ABSTRACT:
A fail-safe protection circuit for a data processor controlled system having a data bus for carrying data and comprising first logic for checking the operation of the data processor controlled system at periodic intervals not greater than T.sub.1 and for producing a trigger pulse at each check if the data processor is operating properly, second logic for detecting the absence of trigger pulses for a time period T.sub.2 to produce a control signal. Gating logic is responsive to the control signal to prevent the transmission of data through the data bus and a control circuit is also responsive to the control signal to reset the system to a predetermined operating state. The first logic responds to the resetting of the system to again produce the periodic trigger pulses if the system is operating properly.
REFERENCES:
patent: 3876987 (1975-04-01), Dalton et al.
patent: 3882455 (1975-05-01), Heck et al.
patent: 3991406 (1976-11-01), Downing et al.
patent: 3991407 (1976-11-01), Jordan, Jr. et al.
patent: 4023109 (1977-05-01), Shreve
patent: 4112488 (1978-09-01), Smith
patent: 4141066 (1979-02-01), Keiles
patent: 4210226 (1980-07-01), Ichioka
patent: 4392226 (1983-07-01), Cook
patent: 4405982 (1983-09-01), Ruhnau et al.
RCA Corporation
Smith Jerry
Tripoli Joseph S.
Ungerman M.
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