Sequential adder

Design a circuit that calculates the addition of two numbers sequentially. The circuit has two inputs, a and b that provide one binary digit at each cycle (starting from the least-significant bits). At each cycle, the circuit produces a binary digit of the addition.

Here is an example of a sequence of cycles (note that time moves from right to left):

  cycle:    ... 7 6 5 4 3 2 1 0
  -----------------------------
  a:        ... 1 0 0 1 1 0 1 0
  b:        ... 0 0 0 1 0 1 1 1
  -----------------------------
  sum:      ... 1 0 1 1 0 0 0 1

Specification

module sequential_adder (a, b, sum, clk, rst);
    input a, b, clk, rst;
    output sum;

Input

a and b are the two sequential inputs.
clk is the clock signal.
rst is the reset signal.

Output

sum generates the addition of aand b sequentially.

Problem information

Author: Jordi Cortadella

Generation: 2026-01-25T13:26:00.481Z