Barrel shifter circuit having rotation function

Details Barrel shifter circuit having rotation function Barrel shifter circuit having rotation function

1991-08-28

1992-10-13

Mai, Tan V.

Boots, shoes, and leggings

G06F 700

Patent

active

051556987

ABSTRACT:
In the n-bit barrel shifter circuit having a rotation function, the inputs of a bidirectional barrel shifter are connected with a rightward shift change device and a leftward shift change device for controlling rightward and leftward shifting in accordance with the number of bits to be shifted up to (n-1), respectively, and a bit shift control signal capable of controlling shifting of bits of {(an integer part of n/2)+1} bits is inputted to the bidirectional barrel shifter. Therefore, the number of elements required in the barrel shifter circuit can be greatly reduced so that the area occupied by them is reduced. Additionally, the load capacitance attendant to each of the output lines of the barrel shifter can be greatly reduced.

REFERENCES:
patent: 3618033 (1971-11-01), Nordquist
patent: 3961750 (1976-06-01), Dao
patent: 4338675 (1982-07-01), Palmer et al.
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patent: 4437166 (1984-03-01), O'Brien
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patent: 5099445 (1992-03-01), Studor et al.
IEEE Transactions on Computers, vol. C-19, No. 9, 1970, W. Nordquist et al., "A Novel Rotate and Shift Circuit Using Bidirectional Gates", pp. 806, 808.

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