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.
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The multiplier array consists of (n-1) rows of carry save adder (CSA), in which each row contains (n -1) full adder (FA) cells.
Carry Save Adder (CSA) is a type of digital adder used to compute the sum of three (or) more n-bit numbers in binary.
Because of the 1 -bit carry save adder is equal to carry save adder.
1 shows 1-bit carry save adder block is the same circuit as a full adder.
In this paper, 3 bit carry save adder (CSA) has been designed using parallel prefix adder circuit.
In Carry Save Adder (CSA), three or more than three n-bits binary numbers are added in parallel at a time.
Carry save adder reduces the addition of three inputs to two outputs and the outputs are sum and carry-out.
The structure of carry save adder has a longest critical path delay in the stages.
The incrementation blocks are used to finding the sizes of the stages in the hybrid variable latency carry save adder structure.
The Wallace tree is constructed using carry save adder to reduce an N-row bit product matrix to an equivalent two row matrix.
It uses carry save adders in addition process which is used to reduce the latency.
The Urdhva Multiplier is applied to binary multiplication, which involves the carry save adders.