Barrel shifter or multiply/divide IC structure

Details Barrel shifter or multiply/divide IC structure Barrel shifter or multiply/divide IC structure

1994-02-14

1995-11-07

Envall, Jr., Roy N.

Boots, shoes, and leggings

36471501, G06F 700, G06F 1500

Patent

active

054652227

ABSTRACT:
A barrel shifter or multiply/divide integrated circuit (IC) structure includes a plurality of stages in series. The number of stages is a function of the number of bits in an input digital data word, and each stage in sequence provides for a different power of two rotary or multiply/divide shift of the digital data word at the input if selected. A multiplexer in each stage selects as an output either the shifted digital data word or the input digital data word for output to the next stage according to a shift amount select command. At the input and output of the series of stages an additional reversal multiplexer selects in response to a shift direction command either the digital data word or a reversed version of the digital data word, which determines the effective direction of the shift in the stages. Logic may be included in each stage to determine whether the shift operation is a rotary or multiply/divide shift operation.

REFERENCES:
patent: 4602349 (1986-07-01), Blackley et al.
patent: 4896287 (1990-01-01), O'Donnell et al.
patent: 4931971 (1990-06-01), Cook et al.
patent: 4980853 (1990-12-01), Hutchins
patent: 4984189 (1991-01-01), Neki
patent: 5155698 (1992-10-01), Niimi

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