High speed adder using a varied carry scheme and related method

Details High speed adder using a varied carry scheme and related method High speed adder using a varied carry scheme and related method

1994-03-07

1994-12-20

Malzahn, David H.

Boots, shoes, and leggings

G06F 750

Patent

active

053750810

ABSTRACT:
A high-speed adder using a varied carry scheme, such as one of the carry-lookahead (CLA) type (30), includes a plurality of adder groups (32-37) each receiving some bits of two input operands. The adder groups are not identical but instead each adder group reduces a delay which is critical to its order. A least significant adder group (32) reduces a delay from operand input to carry output. A most-significant group (37) reduces a delay from carry input to sum output. Intermediate groups (33-36) reduce a delay from carry input to carry output.

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