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A spanning tree carry lookahead adder

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2 Author(s)
Lynch, T. ; Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX, USA ; Swartzlander, E.E.

The design of the 56-b significant adder used in the Advanced Micro Devices Am29050 microprocessor is described. Originally implemented in a 1-μm design role CMOS process, it evaluates 56-b sums in well under 4 ns. The adder employs a novel method for combining carries which does not require the back propagation associated with carry lookahead, and is not limited to radix-2 trees, as is the binary lookahead carry tree of R.P. Brent and H.T. Kung (1982). The adder also utilizes a hybrid carry lookahead-carry select structure which reduces the number of carriers that need to be derived in the carry lookahead tree. This approach produces a circuit well suited for CMOS implementation because of its balanced load distribution and regular layout

Published in:

Computers, IEEE Transactions on  (Volume:41 ,  Issue: 8 )

Date of Publication:

Aug 1992

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