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  2. Carry-lookahead adder - Wikipedia

    en.wikipedia.org/wiki/Carry-lookahead_adder

    Carry-lookahead logic uses the concepts of generating and propagating carries. Although in the context of a carry-lookahead adder, it is most natural to think of generating and propagating in the context of binary addition, the concepts can be used more generally than this.

  3. Lookahead carry unit - Wikipedia

    en.wikipedia.org/wiki/Lookahead_carry_unit

    A lookahead carry unit (LCU) is a logical unit in digital circuit design used to decrease calculation time in adder units and used in conjunction with carry look-ahead adders (CLAs). 4-bit adder [ edit ]

  4. Kogge–Stone adder - Wikipedia

    en.wikipedia.org/wiki/Kogge–Stone_adder

    An example of a 4-bit Kogge–Stone adder is shown in the diagram. Each vertical stage produces a "propagate" and a "generate" bit, as shown. The culminating generate bits (the carries) are produced in the last stage (vertically), and these bits are XOR'd with the initial propagate after the input (the red boxes) to produce the sum bits. E.g., the first (least-significant) sum bit is ...

  5. 74181 - Wikipedia

    en.wikipedia.org/wiki/74181

    Multiple 'slices' can be combined for arbitrarily large word sizes. For example, sixteen 74S181s and five 74S182 look ahead carry generators can be combined to perform the same operations on 64-bit operands in 28 nanoseconds (36 MHz). Although overshadowed by the performance of today's multi-gigahertz 64-bit microprocessors, this was quite ...

  6. Lookahead - Wikipedia

    en.wikipedia.org/wiki/Lookahead

    Look-ahead (backtracking), a subprocedure that attempts to predict the effects of choosing a branching variable to evaluate or one of its values; Lookahead carry unit, a logical unit in digital circuit design used to decrease calculation time in adder units; Look Ahead, a charitable housing association in London

  7. List of 7400-series integrated circuits - Wikipedia

    en.wikipedia.org/wiki/List_of_7400-series...

    9-bit odd/even parity bit generator/checker 14 SN74LS280: 74x281 1 4-bit parallel binary accumulator 24 SN74S281: 74x282 1 look-ahead carry generator, selectable carry inputs 20 SN74AS282: 74x283 1 4-bit binary full adder (has carry in function) 16 SN74LS283: 74x284 1 4-bit by 4-bit parallel binary multiplier (high order 4 bits of product) 16 ...

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  9. Carry-skip adder - Wikipedia

    en.wikipedia.org/wiki/Carry-skip_adder

    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.

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