Fast forwarding ALU

Details Fast forwarding ALU Fast forwarding ALU

2006-06-06

2006-06-06

Mai, Tan V. (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

C708S707000, C708S525000

Reexamination Certificate

active

07058678

ABSTRACT:
An apparatus and method for performing fast arithmetic operations, including addition, in a pipelined circuit is described. The apparatus and method operating on a first binary number and a second binary number comprise: a first arithmetic logic unit (ALU) operating on a first lower portion of the first binary number and a second lower portion of the second binary number to produce a first result and a carry out signal; and a second ALU operating on a first upper portion of the first binary number and a second upper portion of the second binary number to produce a second result; wherein at least a portion of the pipelined circuit stalls in response to the carry out signal. Another embodiment includes memory comprising a plurality of words, each word comprising data bits and a flag bit indicating a predetermined number of the most significant data bits are all zero.

REFERENCES:
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patent: 5745397 (1998-04-01), Nadehara
patent: 5912833 (1999-06-01), Jang et al.
patent: 6832235 (2004-12-01), Muramatsu et al.

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