Carry lookahead circuit for semiconductor integrated circuit

Details Carry lookahead circuit for semiconductor integrated circuit Carry lookahead circuit for semiconductor integrated circuit

1993-02-18

1995-02-28

Envall, Jr., Roy N.

Boots, shoes, and leggings

G06F 750

Patent

active

053943520

ABSTRACT:
A carry lookahead circuit for an operation circuit having arithmetic units includes an AND gate and an OR gate for each arithmetic unit. A lookahead carry signal to be inputted to a third arithmetic unit of the operation circuit is the output of the OR gate or the logical sum of the output of the AND gate, which is the logical product of the lookahead carry signal from the OR gate to be inputted to a second arithmetic unit and the carry condition output of the second arithmetic unit, and the carry output signal of the second arithmetic unit. This arrangement can reduce the number of AND gates used in the conventional carry lookahead circuit by two (by(m-3) for m arithmetic units) and will make possible the reduction of the chip-occupying area of the structural elements and the load capacitances of signal transfer paths in the circuit.

REFERENCES:
patent: 3987291 (1986-10-01), Gooding et al.
patent: 4761760 (1988-08-01), Tomoji
patent: 4876661 (1989-10-01), Koya
patent: 5117386 (1992-05-01), Persoon et al.
patent: 5122982 (1992-06-01), Cohn

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