Verilog Full Adder

A full adder is a digital circuit that performs the addition of three inputs: two binary digits (bits) and a carry bit (from a previous addition). The output of a full adder is the sum of the three bits and a carry-out bit.

The Verilog code for a full adder consists of three inputs (A, B, and C) and two outputs (S and Cout). A and B are the two binary digits to be added, and C is the carry input. S is the sum of the three inputs, and Cout is the carry-out bit.

Here is the Verilog code for a full adder:

module FullAdder(A, B, C, S, Cout);
    input A, B, C;
    output S, Cout;
    
    assign S = A ^ B ^ C;
    assign Cout = (A & B) | (C & (A ^ B));
endmodule

In this code, the ^ operator is the XOR (exclusive OR) operator, which returns 1 if the two inputs are different and 0 if they are the same. The & operator is the AND operator, which returns 1 if both inputs are 1 and 0 otherwise.

The output S is calculated by XORing the three inputs (A, B, and C). The output Cout is calculated by ANDing A and B (which produces a carry for the columns where both inputs are 1) and ORing that with the result of ANDing C with the XOR of A and B (which produces a carry for the columns where only one input is 1).

The assign statement is used to assign the output values of S and Cout based on the input values of A, B, and C.

This Verilog code can be used in a larger digital circuit to perform addition with multiple bits.