High-speed barrel shifter

Details High-speed barrel shifter High-speed barrel shifter

1994-08-18

1995-05-16

Malzahn, David H.

Boots, shoes, and leggings

G06F 501

Patent

active

054167310

ABSTRACT:
A high-speed barrel shifter (20) includes a shifter array (25) having a matrix of transistors (40) located at intersections of rows and columns of the matrix (40). The rows and columns alternately function as source and destination terminals. A fill portion (48) fills either a predetermined value or a data-dependent value such as a sign bit into vacated bit positions along rows in a bottom left portion (42). Thus the barrel shifter (20) can perform a data-dependent fill instruction within the shifter array (25) and avoids extra clock cycles associated with post-array processing. In one embodiment, an isolation portion (44, 45) separates a top right portion (41) of the matrix (40) from the bottom left portion (42) along a diagonal (43). The isolation portion (44, 45) isolates transistors in the bottom left portion (42), which are associated with rotates and fills, from transistors in the top right portion (41), which are associated with shifts, according to the direction of the shift.

REFERENCES:
patent: 4583197 (1986-04-01), Chappell et al.
patent: 4807172 (1989-02-01), Nukiyama
patent: 4827441 (1989-05-01), Someshwar et al.
patent: 4829460 (1989-05-01), Ito
patent: 4999796 (1991-03-01), DeWitt et al.
patent: 5099445 (1992-03-01), Studor et al.
patent: 5155698 (1992-10-01), Niimi
G. T. Paul and J. F. Dirac, "Column Shifter," IBM Technical Disclosure Bulletin, vol. 4, No. 10, Mar. 1962, pp. 79-80.

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