Tuesday, 30 April 2013

4 bit Arithmetic Circuit


Basic Theory:
An arithmetic circuit is a logic circuit that performs basic arithmetic operations like addition, subtraction, increment, decrement and transfer operations using a single combinational circuit. It uses multiplexers and full adders to do so. The selection bits, along with an additional input at 2 and 3 input positions of the multiplexer, determine the type of operation to be done on the input data. This is further clarified by the function table below. As usual, a 4-bit arithmetic circuit works with 4-bit data.

Function Table for Arithmetic Circuit:

Circuit Diagram:

Reference:
Mano, M. (n.d), Register Transfer and Micro-operations: Arithmetic Circuit, Computer System Architecture (3rd Edition), pp. 106-108

1 comment:

  1. hi, i appreciate your effort in explaining this, i understood is well too, so thank you.
    but there is a minor mistake in your truth table i suppose, the inputs for (0 1 0) and (0 1 1) should be ~(B) i.e compliment of "B".

    ReplyDelete

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