carry-save adder


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carry-save adder

[¦kar·ē ¦sāv ′ad·ər]
(computer science)
A device for the rapid addition of three operands; consists of a sequence of full adders, in which one of the operands is entered in the carry inputs, and the carry outputs, instead of feeding the carry inputs of the following full adders, form a second output word which is then added to the ordinary output in a two-operand adder to form the final sum.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Then, the operands are recoded because the digit recurrence iteration uses a redundant digit representation with BCD-4221 carry-save adders.