Asynchronous digital circuit testing and diagnosing system

Details Asynchronous digital circuit testing and diagnosing system Asynchronous digital circuit testing and diagnosing system

1977-09-02

1979-02-13

Atkinson, Charles E.

Registers

Systems controlled by data bearing records

Time analysis

324 73R, G06F 1100, G01R 1500

Patent

active

041391470

ABSTRACT:
Improved means and methods are described for continuously and asynchronously testing and diagnosing the operation of a digital circuit or unit. A predetermined plurality of test signal segments are concurrently applied to the unit under test and to a standard unit. The respective outputs of these units are then continuously and asynchronously compared to determine whether, at any time, these outputs are out of skew for at least an adjustable predetermined minimum time period. The detection of this excessive out of skew condition is used as an indication of an actual or potential failure. The segment and clock for which the failure occurs is determined and looping of the error segment is provided as an aid in diagnosis.

REFERENCES:
patent: 3814920 (1974-06-01), Huelters
patent: 3821645 (1974-06-01), Vinsani
patent: 3832535 (1974-08-01), De Vito
patent: 3916306 (1975-10-01), Patti
patent: 3927310 (1975-12-01), D'Anna et al.
patent: 3976940 (1976-08-01), Chau et al.
patent: 4048481 (1977-09-01), Bailey, Jr. et al.

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