Excavating
Patent
1991-10-18
1993-06-08
Beausoliel, Jr., Robert W.
Excavating
395575, 364285, 371 683, 371 251, G06F 1100
Patent
active
052186067
ABSTRACT:
In a current-spare switching control system provided for a data processing system having a current data processor, a spare data processor, a fault supervisor for supervising the fault of these processors, and switching units for switching from the current data processor to the spare data processor or vice versa, the current-spare switching control system includes: a storage unit for temporarily storing data bits from the fault supervisor; a discrimination unit operatively connected to the storage unit and for comparing the data bits with a reference signal and outputting a coincidence signal when the data bits coincides with the reference signal; an AND gate operatively connected to the discrimination unit for inputting the coincidence signal and a write command from the fault supervisor, and outputting a write signal when the coincidence signal coincides with the write command; a register unit operatively connected to the AND gate for inputting a data bit from the fault supervisor and outputting a switching signal to switch from the current data processor to the spare data processor or vice versa.
REFERENCES:
patent: 3876987 (1975-04-01), Dalton et al.
patent: 4628508 (1986-12-01), Sager et al.
patent: 4823256 (1989-04-01), Bishop et al.
patent: 4849939 (1989-07-01), Muranaka et al.
European Search Report dated Nov. 19, 1992.
Eguchi Yoshitaka
Yoshimura Junichi
Beausoliel, Jr. Robert W.
Chung Phung My
Fujitsu Limited
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