`timescale 1ns / 1ps ////////////////////////////////////////////////////////////////////////////////// // Company: // Engineer: // // Create Date: 2022/01/18 15:12:36 // Design Name: // Module Name: ALU UUT // Project Name: // Target Devices: // Tool Versions: // Description: // // Dependencies: // // Revision: // Revision 0.01 - File Created // Additional Comments: // ////////////////////////////////////////////////////////////////////////////////// module ALU( input [15:0] A, input [15:0] B, input Cin, input [3:0] OP, output Cout, output [15:0] C ); wire [15:0] csum, csub1, csub2; wire cout_sum, cout_sub1, cout_sub2; add_16 a1(A, B, Cin, csum, cout_sum); add_16 s1(16'b0, B, Cin, csub1, cout_sub1); add_16 s2(A, ~csub1, 1'b1, csub2, cout_sub2); assign Cout = (OP == 4'd0)? cout_sum : (OP == 4'd1)? ((A<csub1 | cout_sub1)? 1'b1: 1'b0) : 1'b0; assign C = (OP == 4'd0)? csum : (OP == 4'd1)? csub2 : (OP == 4'd2)? A : (OP == 4'd3)? ~(A&B) : (OP == 4'd4)? ~(A|B) : (OP == 4'd5)? ~(A^B) : (OP == 4'd6)? ~A : (OP == 4'd7)? A&B : (OP == 4'd8)? A|B : (OP == 4'd9)? A^B : (OP == 4'd10)? {1'b0, A[15:1]} : (OP == 4'd11)? {A[15], A[15:1]} : (OP == 4'd12)? {A[0], A[15:1]} : (OP == 4'd13)? {A[14:0], 1'b0} : (OP == 4'd14)? {B[7:0], 8'd0} : (OP == 4'd15)? {A[14:0], A[15]} : 16'h0; endmodule module full_adder(input a, input b, input cin, output sum, output carry); assign sum = a^b^cin; assign carry = a&b | a&cin | b&cin; endmodule module add_16(input [15:0] a, input [15:0] b, input cin, output [15:0]sum, output carry); wire [14:0] cout; full_adder fadd0(a[0], b[0], cin, sum[0], cout[0]); genvar i; for(i=1;i<15;i=i+1)begin:generate_adder full_adder fadd1(a[i], b[i], cout[i-1], sum[i], cout[i]); end full_adder fadd2(a[15], b[15], cout[14], sum[15], carry); endmodule