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  2. Carry-lookahead adder - Wikipedia

    en.wikipedia.org/wiki/Carry-lookahead_adder

    Logic gate implementation of a 4-bit carry lookahead adder. A block diagram of a 4-bit carry lookahead adder. For each bit in a binary sequence to be added, the carry-lookahead logic will determine whether that bit pair will generate a carry or propagate a carry. This allows the circuit to "pre-process" the two numbers being added to determine ...

  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. File:4-bit ripple carry adder.svg - Wikipedia

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

    This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.: You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work

  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. File:Four bit adder with carry lookahead.svg - Wikipedia

    en.wikipedia.org/wiki/File:Four_bit_adder_with...

    This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law.

  7. Adder (electronics) - Wikipedia

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

    In a 32-bit ripple-carry adder, there are 32 full adders, so the critical path (worst case) delay is 3 (from input to carry in first adder) + 31 × 2 (for carry propagation in latter adders) = 65 gate delays. [6] The general equation for the worst-case delay for a n-bit carry-ripple adder, accounting for both the sum and carry bits, is:

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