subt.v

`timescale 1ns / 1ps
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// Company: 
// Engineer: 
// 
// Create Date: 11/28/2018 03:18:07 PM
// Design Name: 
// Module Name: subt
// Project Name: 
// Target Devices: 
// Tool Versions: 
// Description: 
// 
// Dependencies: 
// 
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
// 
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module Sub(a,b,cin,diff,borrow);
input [31:0] a;
input [31:0] b;
output [31:0] diff;
output borrow;
input cin;
sub one(a[3:0],b[3:0],cin,diff[3:0],b1);
sub second(a[7:4],b[7:4],b1,diff[7:4],b2);
sub third(a[11:8],b[11:8],b2,diff[11:8],b3);
sub fourth(a[15:12],b[15:12],b3,diff[15:12],b4);
sub fifth(a[19:16],b[19:16],b4,diff[19:16],b5);
sub sixth(a[23:20],b[23:20],b5,diff[23:20],b6);
sub seventh(a[27:24],b[27:24],b6,diff[27:24],b7);
sub eigth(a[31:28],b[31:28],b7,diff[31:28],borrow);
endmodule