Design and implement a 4 bit full adder.
STRUCTURAL MODEL
`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company: EAM
// Create Date: 08:15:45 04/29/2015
// Module Name: Adder
// Project Name: FULL ADDER STRUCTURAL
//////////////////////////////////////////////////////////////////////////////////
module Adder(a,b,cin,sum,cout);
input [3:0]a,b;
input cin;
output wire [3:0]sum;
output cout;
FullAdder FA1(a[0],b[0],cin,sum[0],cout1);
FullAdder FA2(a[1],b[1],cout1,sum[1],cout2);
FullAdder FA3(a[2],b[2],cout2,sum[2],cout3);
FullAdder FA4(a[3],b[3],cout3,sum[3],cout);
endmodule
module FullAdder(a,b,cin,sum,cout);
input a,b,cin;
output wire sum,cout;
wire s1,c1,c2,c3;
xor(s1,a,b);
xor(sum,s1,cin);
and(c1,a,b);
and(c2,b,cin);
and(c3,a,cin);
or(cout,c1,c2,c3);
endmodule
BEHAVIORAL MODEL
`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company: EAM
// Create Date: 08:15:45 04/29/2015
// Module Name: Adder
// Project Name: FULL ADDER BEHAVIORAL
//////////////////////////////////////////////////////////////////////////////////
module FullAdder(A,B,Cin,Sum,Cout);
input [3:0]A,B;
input Cin;
output wire [3:0]Sum;
output wire Cout;
wire [4:0]temp;
assign temp=A+B+Cin;
assign Sum=temp[3:0];
assign Cout=temp[4];
endmodule
