Watchdog circuit

Details Watchdog circuit Watchdog circuit

1984-05-01

1986-10-21

Atkinson, Charles E.

Excavating

364200, 371 62, G06F 1100

Patent

active

046189530

ABSTRACT:
A watchdog circuit for improving the possibility of recovery from failures, such as those caused by static discharge or RF interference, in a data processing system. A data processing system includes a main, multi-chip processor for handling the main computational burden and a single-chip processor for handling I/O functions. Additionally, the main processor periodically sends status to the single-chip processor. If the single-chip processor does not receive status within a predetermined period it generates a reset signal to the main processor. In response to the reset signal the main processor interrogates the single-chip processor to determine if the reset was caused by a failure or a power-on condition. Because of its self contained construction the single-chip processor is less susceptible to static induced failures and will improve the recovery capabilities of the system when used to monitor the main processor.

REFERENCES:
patent: 3795800 (1974-03-01), Nimmo
patent: 4072852 (1978-02-01), Hogan et al.
patent: 4300199 (1981-11-01), Yoknis et al.
patent: 4488303 (1984-12-01), Abramovich
patent: 4513417 (1985-04-01), Lamb et al.
patent: 4538273 (1985-08-01), Lasser
patent: 4551841 (1985-11-01), Fujita et al.

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