Easily testable high speed digital counter

Details Easily testable high speed digital counter Easily testable high speed digital counter

1991-10-15

1993-02-09

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Identifying or correcting improper counter operation

377 28, 377 55, H03K 2140

Patent

active

051857693

ABSTRACT:
A high speed digital counter that can be easily tested comprises a plurality of subcounters having an input for receiving an incrementing signal and a carry output for outputting a carry signal when the subcounter has reached its counting capacity. The carry output of each subcounter is gated to the input of a next more significant subcounter by an OR gate which receives as inputs the carry signal and a test signal. The OR gate performs an OR on these two signals and outputs the result to the input of the next more significant subcounter. The OR gate allows the test signal to access each subcounter separately, and thus, each subcounter may be tested individually.

REFERENCES:
patent: 4736395 (1988-04-01), Sugihara
patent: 4860325 (1989-08-01), Aria et al.
patent: 4979193 (1990-12-01), Mehta

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