4-bit adder

Design a circuit that performs the addition of two 4-bit numbers. The result (mod 16) must be represented in 4 bits also.

Specification

module adder4(a, b, sum);
    input [3:0] a, b;
    output [3:0] sum;

Hint

You may want to use several instances of a 1-bit full adder.

Input

• a and b are the two 4-bit number.

Output

• sum is the 4-bit output representing $(a+b) \textrm{~mod~} 16$.

Problem information

Author: Jordi Cortadella

Generation: 2026-02-03T12:11:17.390Z

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