//-----------------------------------------------------------------------------
//
// Title       : alu_tf
// Design      : y86v2
// Author      : 
// Company     : 
//
//-----------------------------------------------------------------------------
//
// File        : z:\my_designs\AlternativeLab4\y86v2\src\alu_tf.v
// Generated   : Thu May 22 11:03:45 2014
// From        : interface description file
// By          : Itf2Vhdl ver. 1.22
//
//-----------------------------------------------------------------------------
//
// Description : 
//
//-----------------------------------------------------------------------------
`timescale 1 ns / 1 ns

//{{ Section below this comment is automatically maintained
//   and may be overwritten
//{module {alu_tf}}
module alu_tf (	 
	output reg [7:0] valA, 
    output reg [7:0] valB,
    output reg OP,
    input [7:0]     valE);
 
   integer results, errors, i;
   reg [7:0] Rexp;

   initial	begin 
      results = $fopen("alu_tf_output.txt");
	
      if (results == 0) begin
	 $display("Error: Unable to open file.");
	 $finish;
      end
      results = results | 1;
      errors = 0;			  		  
	  
      for(i= 0; i<1000; i=i+1) begin
	 valA = $random; valB = $random; OP = $random;
	 if ($random & 1) valB = ~valA;
	 case (OP) 
	   0: begin
	      Rexp = valA + valB;
	   end
	   1: begin
	      Rexp = valB - valA;
	   end
	   2: begin
	      Rexp = valA & valB;
	   end
	   3: begin
	      Rexp = valA ^ valB;
	   end
	 endcase // case (OP)																				
	 #20				 
	 $fdisplay(results, "Calculating: valA=%x valB=%x Op=%x: Expected result=%x", valA, valB, OP, Rexp);
	 if ((valE !== Rexp[7:0])) begin	 																	
	    $fdisplay(results, "Error: Got =%x", valE);
	    errors = errors + 1;
	 end
      end // for (i= 0; i<1000; i=i+1)
	 $fdisplay(results, "END of test - %d errors found", errors);
      $fclose(results);
   end
endmodule