Multibit shifting apparatus, data processor using same, and meth

Details Multibit shifting apparatus, data processor using same, and meth Multibit shifting apparatus, data processor using same, and meth

1994-05-26

1995-08-15

Mai, Tan V.

Boots, shoes, and leggings

364754, G06F 700, G06F 752

Patent

active

054425760

ABSTRACT:
A multibit shifting apparatus (50) of a data processor (40) includes a multiplier (55) such as a modified Booth's recoded multiplier for use in normal multiplication operations. The multibit shifting apparatus (50) also uses the multiplier (55) to perform programmable left and right shifts in order to save circuit area. During a shift operation, a remapping circuit (54) receives a shift count, and remaps the shift count according to a shift direction to provide a remapped signal. The multiplier (55) receives both a shift operand and the remapped signal at inputs thereof. The multiplier (55) provides a first shift result at its output. In one embodiment, an output shifter (57) shifts the first shift result by a fixed amount selectively according to the shift direction to provide a second shift result. The second shift result includes outputs of both left and right shifts in common bit positions.

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patent: 4887232 (1989-12-01), Wolrich et al.
patent: 5099445 (1992-03-01), Studor et al.
patent: 5218564 (1993-06-01), Covey
patent: 5309382 (1994-05-01), Tamura et al.
Motorola, Inc.; "DSP56116 Digital Signal Processor User's Manual;" Section 3; pp. 3-1-14 (1990).

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