Bit field operating system and method with two barrel shifters f

Details Bit field operating system and method with two barrel shifters f Bit field operating system and method with two barrel shifters f

1994-11-14

1996-06-11

Bowler, Alyssa H.

Boots, shoes, and leggings

364736, 364748, 395375, 395800, G06F 738

Patent

active

055262961

ABSTRACT:
A second barrel shifter whose shift amount is equally controlled as that of a first barrel shifter for shifting input data by an optional bit is employed as a mask data generating circuit in a bit field operational arithmetic unit. Areas with transistor trains of the first and second barrel shifters are formed in parallel to an area having the same width as that of a 1-bit storage cell of a register file and shift amount control lines in both barrel shifters are set for common use so as to reduce the area occupied by a chip. In order to increase the processing speed of extracting an optional area of data, the bit field operational arithmetic unit is provided with a circuit for subjecting all bits to signal expansion in No. 0 bit data in parallel to the shift of input data effected by the first barrel shifter. Moreover, barrel shift circuits include left and right shift circuits as n shift circuits for shifting 2.sup.i -bit (i=0, 1, 2, . . . , n-1) data, with n as a positive integer. Consequently, an optional number of bits up to 2.sup.n -bit of input data can thus be shifted by directing fetching n-bit shift control data.

REFERENCES:
patent: 4488252 (1984-12-01), Vassar
patent: 4512018 (1985-04-01), Phelps et al.
patent: 4760517 (1988-07-01), Miller et al.
patent: 4785393 (1988-11-01), Chu et al.
patent: 4807043 (1989-02-01), Kaku et al.
patent: 4807175 (1989-02-01), Tokumaru et al.
patent: 4821208 (1989-04-01), Ryan et al.
patent: 4829460 (1989-05-01), Ito
patent: 4973956 (1990-11-01), Lih et al.
patent: 5095460 (1992-03-01), Rodeheffer
patent: 5170468 (1992-12-01), Shah et al.
patent: 5202962 (1993-04-01), Matsuo et al.
patent: 5332995 (1994-07-01), Katsura et al.

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