Hello Everyone,
What is Full Adder ?
An Full Adder is digital/logic circuit which adds three inputs and gives two outputs. Lets see the following circuit.
The above circuit shown is of Full Adder which has three inputs, input A, B, and Cin and has two outputs SUM and Carry_out. A full adder can take 8 input cobinations of three bits each.
See the above Truth table of Full Adder.
Output Equations for Full Adder :-
SUM = (A xor B) xor Cin
Carry_out = A.B+Cin(A xor B)
Verilog Code For Full Adder :-
RTL :-
// Code your design here
module full_adder( A, B, Cin, S, Cout);
input wire A, B, Cin;
output reg S, Cout;
always @(A or B or Cin)
begin
S = A ^ B ^ Cin;
Cout = A&B | (A^B) & Cin;
end
endmodule
TestBench :-
// Code your testbench here
module full_adder_tb();
reg A,B,Cin;
wire S,Cout;
//Verilog code for the structural full adder
full_adder DUT ( A, B, Cin, S, Cout);
initial begin
A = 0;
B = 0;
Cin = 0;
#5;
A = 0;
B = 0;
Cin = 1;
#5;
A = 0;
B = 1;
Cin = 0;
#5;
A = 0;
B = 1;
Cin = 1;
#5;
A = 1;
B = 0;
Cin = 0;
#5;
A = 1;
B = 0;
Cin = 1;
#5;
A = 1;
B = 1;
Cin = 0;
#5;
A = 1;
B = 1;
Cin = 1;
#5;
end
initial
begin
$monitor("Values of A=%0d,B=%0d,Cin=%0d,S=%0d,Cout=%0d", A,B,Cin,S,Cout);
end
endmodule
For EDAPlaygroung Link is Here :-
https://www.edaplayground.com/x/Nztx
