Apparatus for signature and/or direct analysis of digital signal

Details Apparatus for signature and/or direct analysis of digital signal Apparatus for signature and/or direct analysis of digital signal

1981-02-24

1984-04-03

Strecker, Gerard R.

Electricity: measuring and testing

Plural, automatically sequential tests

371 25, G01R 3128, G01R 1512, G06F 1100

Patent

active

044410743

ABSTRACT:
A digital circuit tester for performing signature analysis is provided with a memory (32) for storing successive samples at 256-bit intervals of the progressively evolving CRC signature of a signal in the circuit under test. Comparison with the same sequence from a known good unit facilitates identification of faults, even in feedback loops. To identify the first failing bit, the test is repeated, but with the CRC feedback connections disabled, and successive blocks of the actual data stream are stored, beginning at the point corresponding to the first faulty signature sample, for subsequent inspection and comparison with the data stream from the known good unit.

REFERENCES:
patent: 3961252 (1976-06-01), Eichelberger
patent: 4176780 (1979-12-01), Sacher et al.
patent: 4192451 (1980-03-01), Swerling et al.
patent: 4280220 (1981-07-01), Vaeches

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