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  2. Carry-lookahead adder - Wikipedia

    en.wikipedia.org/wiki/Carry-lookahead_adder

    The carry-lookahead 4-bit adder can also be used in a higher-level circuit by having each CLA logic circuit produce a propagate and generate signal to a higher-level CLA logic circuit. The group propagate ( P G {\displaystyle PG} ) and group generate ( G G {\displaystyle GG} ) for a 4-bit CLA are:

  3. Lookahead carry unit - Wikipedia

    en.wikipedia.org/wiki/Lookahead_carry_unit

    By combining 4 CLAs and an LCU together creates a 16-bit adder. Four of these units can be combined to form a 64-bit adder. An additional (second-level) LCU is needed that accepts the propagate and generate from each LCU and the four carry outputs generated by the second-level LCU are fed into the first-level LCUs.

  4. Adder (electronics) - Wikipedia

    en.wikipedia.org/wiki/Adder_(electronics)

    4-bit adder with carry lookahead 64-bit adder with carry lookahead. To reduce the computation time, Weinberger and Smith invented a faster way to add two binary numbers by using carry-lookahead adders (CLA). [8]

  5. 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 ...

  6. Brent–Kung adder - Wikipedia

    en.wikipedia.org/wiki/Brent–Kung_adder

    The Brent–Kung adder is a parallel prefix adder (PPA) form of carry-lookahead adder (CLA). Proposed by Richard Peirce Brent and Hsiang Te Kung in 1982 it introduced higher regularity to the adder structure and has less wiring congestion leading to better performance and less necessary chip area to implement compared to the Kogge–Stone adder (KSA).

  7. Carry-select adder - Wikipedia

    en.wikipedia.org/wiki/Carry-select_adder

    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.

  8. Carry-skip adder - Wikipedia

    en.wikipedia.org/wiki/Carry-skip_adder

    Breaking this down into more specific terms, in order to build a 4-bit carry-bypass adder, 6 full adders would be needed. The input buses would be a 4-bit A and a 4-bit B, with a carry-in (CIN) signal. The output would be a 4-bit bus X and a carry-out signal (COUT). The first two full adders would add the first two bits together.

  9. File:4-bit carry lookahead adder.svg - Wikipedia

    en.wikipedia.org/wiki/File:4-bit_carry_lookahead...

    Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.