Variable shift-count bidirectional shift control circuit

Details Variable shift-count bidirectional shift control circuit Variable shift-count bidirectional shift control circuit

1987-02-17

1989-02-21

Harkcom, Gary V.

Boots, shoes, and leggings

364748, G06F 700

Patent

active

048071722

ABSTRACT:
A shift control circuit comprising an arithmetic circuit for producing a string of a predetermined number of data bits, a logic circuit for detecting the positive or negative sign of the bit string and producing a first switch signal responsive to the positive sign of the bit string or a second switch signal responsive to the negative sign of the bit string, a one's complement generator circuit for producing a signal representative of the one's complement of the bit string, a first selective signal transfer circuit such as a multiplexer which is transparent directly to the bit string in response to the first switch signal or to the signal from the one's complement generator circuit in response to the second switch signal, a decoder circuit for decoding the bit string or the signal passed through the first selective signal transfer circuit for producing a decoded output signal, a single-bit shifter circuit for shifting the bit of the decoded output signal by a single bit in a predetermined direction for producing a single-bit shifted output signal, and a second selective signal transfer circuit such as a multiplexer which is transparent directly to the decoded output signal in response to the first switch signal or to the signal from the single-bit shifter circuit in response to the second switch signal.

REFERENCES:
patent: 3193669 (1965-07-01), Voltin
patent: 4366548 (1982-12-01), Kregness et al.
patent: 4562553 (1985-12-01), Mattedi et al.
patent: 4644490 (1987-02-01), Kobayashi et al.
patent: 4649508 (1987-03-01), Kanuma
Smith et al., "Fix-Point, Floating-Point Adder", Technical Note No. 846, RCA, Aug. 20, 1969.
Earle et al., "Exponent Differences and Preshifter", IBM Tech. Disclosure Bulletin, vol. 9, No. 7, Dec. 1966, pp. 848-849.

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