Apparatus and method for detecting an overflow when shifting N b

Details Apparatus and method for detecting an overflow when shifting N b Apparatus and method for detecting an overflow when shifting N b

1993-06-14

1996-03-05

Lall, Parshotam S.

Boots, shoes, and leggings

36471508, G06F 0501

Patent

active

054973406

ABSTRACT:
A data comparator detects the coincidence or non-coincidence of the logical states between two adjacent bits of the plural bit input data and applies the comparison result signal to a non-coincident bit detection circuit. A mask generator decodes a shift select signal indicating the amount of shift to produce mask data and applies the produced mask data to a non-coincident bit detection circuit. The non-coincident bit detection circuit masks the output of the data comparator on the basis of the mask data and decides whether or not an overflow is produced from the masked output of the data comparator to output the result of decision.

REFERENCES:
patent: 4012722 (1977-03-01), Gajski et al.
patent: 4899304 (1990-02-01), Terane et al.
patent: 4931970 (1990-06-01), Cook et al.
patent: 4941119 (1990-07-01), Moline
patent: 5231600 (1993-07-01), Robidoux et al.

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