alu_test.v

4位alu

//--------------------------------------------------------------------
//
//      Design          :      testbench of alu
//
//      File name       :       alu_test.v
//
//      Purpose         :       
//
//      Limitations     :       
//
//      Errors          :       None known
//
//      Include files   :       None
//
//      Author          :       Ji Zhang, Nov 30, 2007
//
//      Simulator       :       ModelSim SE 6.1
//
//--------------------------------------------------------------------
//      Revision List
//      Version         Author          Date            Change
//                                                      
//      0.1              Ji Zhang       07/11/30       
//--------------------------------------------------------------------
`timescale 1 ns /100 ps

 module alu_test ;

 
 reg   clk;
 reg   rst;
 reg   m;
 reg   s0;
 reg   s1;
 reg   c0;
 reg   [3:0]a;
 reg   [3:0]b;
 wire  [3:0]out;
 wire  cout;
 integer k;
 integer j;
 integer i;
 alu   alu (     

           .M             (m),
           .S0            (s0),
           .S1            (s1), 
           .c0            (c0),          
           .a             (a),
           .b             (b),
           .f           (out),
           .cout          (cout)
 );
 
 
 always
 # 5 clk = ~clk;
 always
 # 2560 c0 = ~c0;
 always
 # 5120 s0 = ~s0;
 always
 # 10240 s1 = ~s1;
 always
 # 20480 m = ~m;
 
 
 initial
   begin
     clk = 1;
     rst = 0; 
     m = 0;
     s0 = 0;
     s1 = 0;
     c0 = 0;
     i=0;
     k=0;
     j=0;
     a = 4'b1111;
     b = 0;

     for (i=0 ; i < 16 ; i = i+1)
       begin
         for (k=0 ; k < 16 ; k = k+1)
           begin
              a = a+1;
             for (j=0 ; j < 16 ; j = j+1)
               begin
                  # 10 b = b+1;
                   
               end
           end
       end
   end
  // always  @ (a or b ) 
  //   begin
  //     if (m == 0)
  //       begin
  //         $display ("At time %t, m is %b, s0 is %b, s1 is %b, c0 is %b, a is %b%b%b%b, b is %b%b%b%b, out is %b%b%b%b, cout is %b", $time, m, s0, s1, c0, a, b, out, cout);
  //       end
  //     else if (m == 1)
  //       begin
    //       $display ("At time %t, m is %b, s0 is %b, s1 is %b, c0 is %b, a is %d, b is %d, out is %d, cout is %b", $time, m, s0, s1, c0, a, b, out, cout);
   //      end
   //  end
  endmodule