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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. 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:

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

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

   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

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. 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.

8. Carry-select adder - Wikipedia

   en.wikipedia.org/wiki/Carry-select_adder

   A 16-bit carry-select adder with a uniform block size of 4 can be created with three of these blocks and a 4-bit ripple-carry adder. Since carry-in is known at the beginning of computation, a carry select block is not needed for the first four bits. The delay of this adder will be four full adder delays, plus three MUX delays.

9. Early completion - Wikipedia

   en.wikipedia.org/wiki/Early_completion

   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 ...