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  2. Adder (electronics) - Wikipedia

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

    By combining multiple carry-lookahead adders, even larger adders can be created. This can be used at multiple levels to make even larger adders. For example, the following adder is a 64-bit adder that uses four 16-bit CLAs with two levels of lookahead carry units.

  3. Carry-lookahead adder - Wikipedia

    en.wikipedia.org/wiki/Carry-lookahead_adder

    [1] [2] Konrad Zuse is thought to have implemented the first carry-lookahead adder in his 1930s binary mechanical computer, the Zuse Z1. [3] Gerald B. Rosenberger of IBM filed for a patent on a modern binary carry-lookahead adder in 1957. [4] Two widely used implementations of the concept are the Kogge–Stone adder (KSA) and Brent–Kung adder ...

  4. Adder–subtractor - Wikipedia

    en.wikipedia.org/wiki/Adder–subtractor

    A 4-bit ripple-carry adder–subtractor based on a 4-bit adder that performs two's complement on A when D = 1 to yield S = B − A. Having an n-bit adder for A and B, then S = A + B. Then, assume the numbers are in two's complement. Then to perform B − A, two's complement theory says to invert each bit of A with a NOT gate then add one.

  5. List of 7400-series integrated circuits - Wikipedia

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

    2-bit binary full adder 14 SN7482: 74x83 1 4-bit binary full adder 16 SN74LS83A: 74x84 1 16-bit RAM: 16 SN7484A: 74x85 1 4-bit magnitude comparator: 16 SN74LS85: 74x86 4 quad 2-input XOR gate: 14 SN74LS86A: 74x87 1 4-bit true/complement/zero/one element 14 SN74H87: 74x88 1 256-bit ROM (32x8) open-collector 16 SN7488A: 74x89 1

  6. 4-bit computing - Wikipedia

    en.wikipedia.org/wiki/4-bit_computing

    4-bit computing is the use of computer architectures in which integers and other data units are 4 bits wide. 4-bit central processing unit (CPU) and arithmetic logic unit (ALU) architectures are those that are based on registers or data buses of that size. A group of four bits is also called a nibble and has 2 4 = 16 possible values, with a ...

  7. 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.

  8. 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 ...

  9. 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.