Self-clocked signature analyzer

Details Self-clocked signature analyzer Self-clocked signature analyzer

1982-12-20

1985-08-06

Smith, Jerry

Excavating

371 24, 371 20, 364200, G06F 304

Patent

active

045340307

ABSTRACT:
A method and circuit for using signature analysis testing techniques without deriving start/stop and clock signals from the device under test. In this invention, a start signal is derived from the output data stream by configuring that data stream to indicate when the test stream begins. The stop signal is derived by counting the predetermined number of data bit cells to be measured and issuing the stop signal when the count is reached. Data clock pulses are derived as a fraction of test system clock pulses at a frequency approximately equal to the bit cell frequency. The data clock pulse is located at the midpoint of the bit cell time so that the data stream is clocked into the signature analysis tester at a stable point.

REFERENCES:
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patent: 3976864 (1976-08-01), Gordon
patent: 4053738 (1977-10-01), Besenfelder et al.
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patent: 4441074 (1984-04-01), Bockett-Pugh et al.
patent: 4454600 (1984-06-01), Le Gresley
IBM Technical Disclosure Bulletin, "Storage Control Unit Sequence and Cycle Scanner", K. D. Crowe et al., vol. 18, No. 10, Mar. 1976, pp. 3377-3378.
IBM Technical Disclosure Bulletin, "Diagnostic Bit Interval Timer", J. D. Dwire et al., vol. 17, No. 8, Jan. 1975, pp. 2418-2420.

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