Bit masking compare circuit

Details Bit masking compare circuit Bit masking compare circuit

1990-01-03

1991-10-22

Harkcom, Gary V.

Communications: electrical

Digital comparator systems

G06F 702

Patent

active

050599429

ABSTRACT:
A masked compare circuit for comparing a first N-bit dataword to a second N-bit dataword, the circuit including a decoder for receiving an M-bit mask code and generating an output signal identifying a bit position, K, derived from the M-bit mask code, M and K being positive integers; and a comparator module responsive to the decoder output signal for comparing the N-K+1 most significant bits of the first dataword to corresponding bits of the second dataword, the comparator module generating an output signal having a first value when all of the compared bits are the same and having a second value when any of the compared bits are different.

REFERENCES:
patent: 3922538 (1975-11-01), Cochran et al.
patent: 4914614 (1990-04-01), Yamakawa

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