Shifter circuit that emulates a barrel shifter

Details Shifter circuit that emulates a barrel shifter Shifter circuit that emulates a barrel shifter

1996-11-22

1998-06-02

Wambach, Margaret Rose

Electrical pulse counters, pulse dividers, or shift registers: c

Shift register

Particular transfer means

377 69, 377 70, 377 75, G11C 1900

Patent

active

057612668

ABSTRACT:
A shifting circuit operates on a plurality of input sub-words, that collectively constitute an input data word, to generate a plurality of result sub-words that collectively represent the input data word, shifted. The shifting circuit receives, during each cycle, a separate one of the plurality of input sub-words. A combiner/selector performs a shift on each sub-word provided on the I-bus, taking carry-in bits from a carry-in register. Before a shifting operation is executed, the carry-in register is initialized to zero. (Alternately, the carry-in register may be reset to zero after a shifting operation is executed.) The carry-in register is also connected to receive the sub-words provided by the data source circuit onto the I-bus. Thus, in a system clock cycle when a particular sub-word on the I-bus is being shifted by the combiner/selector, the carry-in register is holding (and providing to the combiner/selector as a source of carry-in bits) the sub-word provided from the carry-in register is the sub-word that was on the I-bus during the previous system clock cycle (except that when the sub-word being shifted is the first sub-word being shifted, the bits of the sub-word provided from the carry-in register are all zero). The shifted sub-words are provided to an OUT-bus in sequence from the combiner/selector.

REFERENCES:
patent: 5295174 (1994-03-01), Shimizu
patent: 5555202 (1996-09-01), Chu
IBM Tech Disc Bul, vol. 28, No. 7, Dec. 1985 "Barrel Sifter" pp. 2769-2772.

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