Arithmetic operation unit having bit inversion function

Details Arithmetic operation unit having bit inversion function Arithmetic operation unit having bit inversion function

1991-12-30

1993-06-29

Smith, Jerry

Boots, shoes, and leggings

G06F 750

Patent

active

052240657

ABSTRACT:
A bit-inversion arithmetic operation unit comprises a first carry signal line for propagating a carry signal from a more significant bit position side to a less significant bit position side, and a second carry signal line for propagating a carry signal from a less significant bit position side to a more significant bit position side. A common logic circuit performs at least a portion of a carry control including a carry propagation of the first and second carry signals and a carry generation. A switching and logic circuit responds to a required arithmetic operation mode so as to control the common logic circuit and to perform the remaining portion of the carry control including the carry propagation of the first and second carry signals and the carry generation.

REFERENCES:
patent: 4831570 (1989-05-01), Abiko
patent: 4897808 (1990-01-01), Nakagawa et al.
patent: 4905179 (1990-02-01), Licciardi et al.
patent: 4974188 (1990-11-01), Dolecek

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