Data bus fault detector

Details Data bus fault detector Data bus fault detector

1980-09-08

1982-05-04

Atkinson, Charles E.

Excavating

371 3, 371 63, G06F 1100

Patent

active

043285830

ABSTRACT:
An error detection circuit detects prolonged sequences of unchanged logic state in a data busing structure. The circuit generates a complementary two rail logic output from a pair of flip-flops. The circuit includes a comparator which compares the logic state of the data input from the bus with the output of one of the flip-flops, and which inputs alternate opposite logic states to that flip-flop as long as the data input exists for a time in the same logic state as the output of the one flip-flop during a cycle. The complementary two rail output changes every cycle to actively exercise the error detection circuit and prevent silent failures therein. The circuit is self-checking because internal failures yield non-complementary outputs.

REFERENCES:
patent: 3530284 (1970-09-01), Wood
patent: 4088876 (1978-05-01), Rege

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