Testing of electrical circuits

Details Testing of electrical circuits Testing of electrical circuits

1993-04-20

1995-05-30

Cosimano, Edward R.

Excavating

375354, 327 16, 327 97, G06F 1300

Patent

active

054208742

ABSTRACT:
The invention facilitates testing of electrical circuitry which includes a circuit receiving a signal asynchronous with respect to the circuit clock. The exact clock pulse on which the asynchronous signal is asserted may be difficult or impossible to predict even when the circuitry inputs are known. However, a range of pulses can be determined during which the asynchronous signal is asserted. The sampling of the asynchronous signal is blocked until the end of the range of pulses. If it is known that at the end of the range of pulses the asynchronous signal should still be asserted provided that the circuitry functions properly, the asynchronous signal is sampled at the end of the range of pulses. Alternatively, if the asynchronous signal can be deasserted by the end of the range of pulses, the assertion of the asynchronous signal is detected and latched by the asynchronous signal pulse detector, and at the end of the range of pulses the circuit samples the value latched by the pulse detector. In both alternatives, the end of the range of pulses facilitates an unabiguous clock pulse at which the asynchronous signal should be sampled.

REFERENCES:
patent: 3042811 (1962-07-01), Clapper
patent: 3225301 (1965-12-01), McCann
patent: 3304504 (1967-02-01), Horlander
patent: 3764920 (1973-10-01), Galcik et al.
patent: 5047658 (1991-09-01), Schrock et al.
patent: 5128970 (1992-07-01), Murphy
patent: 5256912 (1993-10-01), Rios

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