Variable length shifter for performing multiple shift and select

Details Variable length shifter for performing multiple shift and select Variable length shifter for performing multiple shift and select

1989-12-26

1992-03-24

Mai, Tan V.

Boots, shoes, and leggings

G06F 700

Patent

active

050994450

ABSTRACT:
A variable length shifter for performing multiple shift and select functions. The shifter has a number of cells equal to an operand length, ordered from a most significant to a least significant, or leftmost to rightmost. Each cell stores a bit of the operand, and is coupled to each adjacent cell and to a cell four bits adjacent in either direction, if any. In addition, each cell is coupled to a return bus for implementation of boundary conditions associated with the operation. Besides being expandable to an arbitrary size operand, the shifter implements a register select function using primarily existing circuitry.

REFERENCES:
patent: 4437166 (1984-03-01), O'Brien
patent: 4509144 (1985-04-01), Palmer et al.
patent: 4636976 (1987-01-01), Takla
patent: 4653019 (1987-03-01), Hodge et al.
patent: 5020013 (1991-05-01), Maher, III et al.

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