Circuit for inverting the latter half of pattern output from dev

Details Circuit for inverting the latter half of pattern output from dev Circuit for inverting the latter half of pattern output from dev

1990-08-23

1991-09-10

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

371 224, 371 251, G01R 3128

Patent

active

050477129

ABSTRACT:
A circuit for inverting the latter half of an expected signal representative of an output expected for a device to be tested with regard to operation thereof by a tester comprises a first flip-flop having a D-input terminal supplied with an inverting signal for controlling inversion of an expected pattern, a R-input terminal supplied with a reference clock signal for determining the period of the expected pattern and a C-input terminal supplied with a clock signal synchronized with transitions in an output pattern of a device to be tested as to whether it operates as desired or not, an exclusive-OR circuit having inputs supplied with the output of the first flip-flop and the expected pattern, respectively, an OR circuit having inputs supplied with the reference clock signal and the clock signal, respectively, and a second flip-flop having a D-input terminal supplied with the output of the exclusive-OR circuit and a C-input terminal supplied with the output of the OR circuit. Devices operating at higher operation cycles than that of the tester can be tested successfully.

REFERENCES:
patent: 4551837 (1985-11-01), Goegelein et al.
patent: 4777616 (1988-10-01), Moore et al.

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