Registers – Transfer mechanism – Traveling pawl
Patent
1976-05-24
1977-05-24
Atkinson, Charles E.
Registers
Transfer mechanism
Traveling pawl
235153AK, 3401725, G06F 1100
Patent
active
040257681
ABSTRACT:
Improved methods and apparatus for testing and diagnosing defects in data processing networks and circuits. The presence of a time-dependent error in a network is determined by testing the network at normal and reduced clock frequencies. If a time-dependent error is found to be present, the clock period during which the error occurs is then determined by repeating the testing of the network at normal clock frequency a predetermined number of times with a different selected clock period being extended for each such repeated test operation. The amount of the clock period extension is chosen to be sufficiently long to prevent occurrence of a time-dependent error if it should occur during that clock period. The error clock period is then determined based on a determination of the particular repeated test operation for which the time-dependent error did not occur. The correct and error states of the network in the clock period immediately following the error clock period are then derived and compared for use in diagnosing the network.
REFERENCES:
patent: 3548177 (1970-12-01), Hartlipp et al.
patent: 3723868 (1973-03-01), Foster
patent: 3761695 (1973-09-01), Eichelberger
patent: 3899665 (1975-08-01), Gaon
patent: 3916306 (1975-10-01), Patti
Irwin, Data Rate Changing for Diagnostic Purposes, IBM Technical Disclosure Bulletin, vol. 14, No. 11, Apr. 1972, pp. 3387-3388.
Missios Michael Herodotus
Werner John Richard
Atkinson Charles E.
Burroughs Corporation
Cass Nathan
Feeney, Jr. Edward J.
Peterson Kevin R.
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