Barrel shifter for rotating data with or without carry

Details Barrel shifter for rotating data with or without carry Barrel shifter for rotating data with or without carry

1987-08-10

1989-05-16

Harkcom, Gary V.

Boots, shoes, and leggings

364900, G06F 700

Patent

active

048315710

ABSTRACT:
In a barrel shifter, carry-including rotation operation is implemented only by hardware in such a way that: an N-bit data is shifted by a given shift count through selectors in response to shift signals to obtain a 2N-bit shifted data; a carry is inserted behind a least significant bit of the shifted data through AND gates responsive to a carry signal and a carry rotate signal; and logical sums of each of N lower significant bits of the sN-bit shifted data and each of (shifted by one bit in the higher significant direction) (N-1) higher significant bits thereof are found through selectors and OR gates in response to a carry rotate signal to obtain an N-bit rotated data with carry.

REFERENCES:
patent: 3961750 (1976-06-01), Dao
patent: 4345316 (1982-08-01), Hirotani et al.
patent: 4383304 (1983-05-01), Hirashima
patent: 4396994 (1983-08-01), Kang et al.
patent: 4472788 (1984-09-01), Yamazaki
patent: 4509144 (1985-04-01), Palmer et al.
patent: 4583197 (1986-04-01), Chappell et al.
patent: 4653019 (1987-03-01), Hodge et al.

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