Fast gate and adder for microprocessor ALU

Details Fast gate and adder for microprocessor ALU Fast gate and adder for microprocessor ALU

1988-10-27

1991-01-29

Shaw, Dale M.

Boots, shoes, and leggings

G06F 750

Patent

active

049891740

ABSTRACT:
A fast logic gate wherein the gate output assumes a first binary state when two or more of the gate inputs assume the same predetermined binary states and wherein the gate output assumes a second binary state otherwise. The delay in propagating the gate output based on a transition at a predetermined one of the gate inputs is relatively small. In a preferred application, the gate is utilized in a microprocessor ALU, more particularly, the portion of each adder bit which generates the carry output, and the predetermined gate input is the carry input of the adder bit. The microprocessor can therefore execute instructions which involve addition or subtraction operations, such as relatively addressing instructions, much more quickily.

REFERENCES:
patent: 4132975 (1979-01-01), Koike
patent: 4330841 (1982-05-01), Yamada et al.
patent: 4686676 (1987-08-01), McPherson

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