Excavating
Patent
1988-11-28
1990-07-24
Fleming, Michael R.
Excavating
371 671, G06F 1100
Patent
active
049439693
ABSTRACT:
Failures of duplicate input signals to two indentical electronic modules which may be units, cards, circuits or other entity, are detected by comparison. In each electronic module functional input signals are captured in a plurality of latches on different, or the same, clock phase. Each input signal is captured directly in latches on the same phase as the functional latch which used it to provide a plurality of link signals which are encoded by techniques, such as parity or residue encoding, and compared. The result of the link signal comparison is stored in a register. The outputs of the register are encoded and are supplied to a comparator which compares a signal from the other identical electronic modules. When miscomparison occurs location of the type of failue is facilitated by the system.
REFERENCES:
patent: 4309768 (1982-01-01), Ault
patent: 4354270 (1982-10-01), Nudiny
patent: 4366535 (1982-12-01), Cedolin
patent: 4723245 (1980-02-01), Leslie
patent: 4734687 (1988-03-01), Jones
Bowen Glenn W.
Bramson Robert S.
Fleming Michael R.
Unisys Corporation
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