Apparatus and method for detecting time-related faults

Details Apparatus and method for detecting time-related faults Apparatus and method for detecting time-related faults

1985-08-02

1987-08-11

Smith, Jerry

Excavating

G06F 1100, H03K 526

Patent

active

046866779

ABSTRACT:
On-line timing signal fault detection is provided by taking advantage of differential signal distribution commonly employed in digital data processing systems. An acceptance window indicative of permissible phase shift variations between the differential signals is established using a plurality of flip-flops having clock and data inputs to which delayed, undelayed, inverted and uninverted versions of the differential signals are applied in a predetermined manner. Also included is the capability of providing fault detection even when one of the differential signals is lost.

REFERENCES:
patent: 3781795 (1973-12-01), Zegers
patent: 4267514 (1981-05-01), Kimsey
patent: 4291274 (1981-09-01), Suzuki
patent: 4362957 (1982-12-01), Stern
patent: 4422176 (1983-12-01), Summers

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