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A carry-skip adder [nb 1] (also known as a carry-bypass adder) is an adder implementation that improves on the delay of a ripple-carry adder with little effort compared to other adders. The improvement of the worst-case delay is achieved by using several carry-skip adders to form a block-carry-skip adder.
These block based adders include the carry-skip (or carry-bypass) adder which will determine and values for each block rather than each bit, and the carry-select adder which pre-generates the sum and carry values for either possible carry input (0 or 1) to the block, using multiplexers to select the appropriate result when the carry bit is known.
Carry-skip adder; Carry-save adder; Carry-select adder; K. Kogge–Stone adder; L. Ling adder; Lookahead carry unit; S. Serial binary adder; Sklansky adder This ...
A 16-bit carry-select adder with variable size can be similarly created. Here we show an adder with block sizes of 2-2-3-4-5, this is the special type of Variable-sized carry select adder, called as square root carry select adder. [2] This break-up is ideal when the full-adder delay is equal to the MUX delay, which is unlikely.
Carry-bypass adders only appeared in-text starting in the 80's, and is an alias of the name "carry-skip adder". I propose that this should be the main article title (carry-skip adder, it currently doesn't exist), and that carry-bypass adder should be redirected there (with a mention that they are indeed the same circuit).
A ripple carry adder is a simple adder circuit, but slow because the carry signal has to propagate through each stage of the adder: This diagram shows a 5-bit ripple carry adder in action. There is a five-stage long carry path, so every time two numbers are added with this adder, it needs to wait for the carry to propagate through all five stages.
A carry-save adder [1] [2] [nb 1] is a type of digital adder, used to efficiently compute the sum of three or more binary numbers. It differs from other digital adders in that it outputs two (or more) numbers, and the answer of the original summation can be achieved by adding these outputs together.
The article carry-skip adder now exists, it used to be called carry-bypass adder (see the talk page for details). I've edited this article, and renamed the instance of carry-bypass adder to carry-skip (although still mentioning the alternative nomenclature).