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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. 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. 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.

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

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

   This file contains additional information, probably added from the digital camera or scanner used to create or digitize it. If the file has been modified from its original state, some details may not fully reflect the modified file.

7. Logic gate - Wikipedia

   en.wikipedia.org/wiki/Logic_gate

   A logic circuit diagram for a 4-bit carry lookahead binary adder design using only the AND, OR, and XOR logic gates.. A logic gate is a device that performs a Boolean function, a logical operation performed on one or more binary inputs that produces a single binary output.

8. 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:

9. 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).