Fast ALU equals zero circuit

Details Fast ALU equals zero circuit Fast ALU equals zero circuit

1987-02-26

1989-03-21

Malzahn, David H.

Boots, shoes, and leggings

G06F 738

Patent

active

048150193

ABSTRACT:
A fast ALU=0 circuit is used with a carry-select lookahead ALU. Preliminary ALU=0 signals are derived for each section of the ALU prior to a carry in signal being received by that section. When the carry in signal is received, a final comparison is made with the least significant bit of the section and the final ALU=0 signal generated. The ALU=0 computation is complete one gate delay after the ALU computation is complete.

REFERENCES:
patent: 3983382 (1976-09-01), Weinberger
patent: 4638450 (1987-01-01), Stoffers
Schmookler, "Design of Large ALUs Using Multiple PLA Macros" IBM J. Res. Develop., vol. 24, No. 1, Jan. 1980, pp. 2-14.

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