6bitadder.v

Manual for DSP sp3 for students who do coding

`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company: 
// Engineer: 
// 
// Create Date:    16:33:36 01/21/2009 
// Design Name: 
// Module Name:    6bitadder 
// Project Name: 
// Target Devices: 
// Tool versions: 
// Description: 
//
// Dependencies: 
//
// Revision: 
// Revision 0.01 - File Created
// Additional Comments: 
//
//////////////////////////////////////////////////////////////////////////////////
module 6bitadder(cin,a[5:0],b[5:0],cout,sum[5:0]);

	input cin;
    input a[5:0];
    input b[5:0];
    output sum[5:0];
    output cout;
	 reg sum[5:0] , cout;
	 wire ctemp[4:0];
	 
	 labfirst l1(cin,a[0],b[0],sum[0],ctemp[0]);
	 labfirst l2(ctemp[0],a[1],b[1],sum[1],ctemp[1]);
	 labfirst l3(ctemp[1],a[2],b[2],sum[2],ctemp[2]);
	 labfirst l4(ctemp[2],a[3],b[3],sum[3],ctemp[3]);
	 labfirst l5(ctemp[3],a[4],b[4],sum[4],ctemp[4]);
	 labfirst l6(ctemp[4],a[5],b[5],sum[5],cout);

endmodule

module labfirst(cin, a, b, sum, cout);

    input cin;
    input a;
    input b;
    output sum;
    output cout;
	 reg sum , cout;
	 
	 always @ (cin , a , b) begin
	 
	 if (a == 1 && b == 1 && cin == 1) begin 
		sum = 1 ;
		cout = 1;
		end 
	
	else if (a == 1 && b == 1 && cin == 0) begin 
		sum = 0 ;
		cout = 1;
		end
	 
	 else if (a == 1  && b == 0 && cin == 0) begin 
		sum = 1 ;
		cout = 0;
		end 
	 
	 else if (a == 1 && b == 0 && cin == 1) begin 
		sum = 0 ;
		cout = 1;
		end 
	else if (a == 0  && b == 1 && cin == 0) begin 
		sum = 1 ;
		cout = 0;
		end 
	 
	 else if (a == 0 && b == 1 && cin == 1) begin 
		sum = 0 ;
		cout = 1;
		end 
	
	
	else if (a == 0 && b == 0 && cin == 1) begin 
		sum = 1 ;
		cout = 0;
		end 
		
		else if (a == 0 && b == 0 && cin == 0) begin 
		sum = 0 ;
		cout = 0;
		end 

		end



endmodule