Barrel shifter

Details Barrel shifter Barrel shifter

1994-12-28

1996-07-02

Envall, Jr., Roy N.

Boots, shoes, and leggings

377 64, 341 67, 341 95, G06F 700, G06F 1500, G11C 1900

Patent

active

055329497

ABSTRACT:
The barrel shifter of the present invention comprises a latch circuit of (m+n) bit, a register for indicating an effective bit length retained in the latch circuit, a selector for connecting the variable length code of maximum n bit with the latch circuit and a counting circuit for counting shifting number. In this invention, the latch circuit is divided by k bit, and the selector is controlled so as to shift bits of difference between the value lastly shifted and the value of the register, and data is retained at the latch circuit. When the value of register exceeds m, the selector outputs m bits to the latch circuit and the data at the latch circuit is shifted m bits.

REFERENCES:
patent: 4827441 (1989-05-01), Someshwar et al.
patent: 5146220 (1992-09-01), Ishikawa
patent: 5465222 (1995-11-01), Seekova
patent: 5465223 (1995-11-01), Nishimura

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