`timescale 1ns/100psmodule tb_div2;   parameter n = 32;   parameter m = 16;//   parameter seed = 200;  //random seed   integer seed;   reg clk, reset;   reg start;   wire [n+m-1:0] D;   wire [n-1:0] R;   wire err, ok;       reg [n-1:0]    dividend;   reg [n-1:0]    divisor;   reg [n+m-1:0]  quotient;   reg [n-1:0]    remainder;      div2 UDIV(clk, reset, start, dividend, divisor, D, R, ok, err);       integer i;           //generate random dividend&divisor and calculate quotient&remainder    function [n+n+(n+m)+(n)-1:0] gen_rand_data;       input integer i;       reg [n+m-1:0] dividend;       reg [n+m-1:0] divisor;       reg [n+m-1:0] quotient;       reg [n+m-1:0] remainder;       integer k;       integer flag;             begin           k = (i/4) % 32 + 1;           flag = 1;                      while(flag)           begin           dividend = {{$random}, {m{1'b0}}};           divisor =  {{m{1'b0}}, {$random}};           //quotient = {$random};           //remainder = {$random};                      divisor = divisor % ( 2 << k);                      if(divisor == {(n+m){1'b0}})           begin               $display("Divisor is zero!!!");           end else begin               flag = 0;           end                      quotient =  dividend / divisor;           remainder = dividend % divisor;                      if(remainder > divisor)            begin              $display("Bad remainder!!!");              $stop;           end                      if(quotient * divisor + remainder != dividend)           begin               $display("bad values!!!");               $stop;           end           end                  gen_rand_data = {dividend[n+m-1:m], divisor[n-1:0], quotient, remainder[n-1:0]};       end    endfunction       initial forever #10 clk = ~clk;   initial   begin      seed = 200;      clk = 0;      reset = 0;	   start = 0;      i = $random(seed);// 	i = $random;             for(i=1; i<=1000; i=i+1)       begin         {dividend, divisor, quotient, remainder} = gen_rand_data(i);         //dividend = 32'b01111101011011011111010111111010;         //divisor  = 32'b11111001001001111001010011110010;         //quotient = 48'b000000000000000000000000000000001000000011100000;         //remainder= 32'b00101000110111101010110001000000;         $display("i=%4d, dividend=32'b%b, divisor=32'b%b;\n          quotient=48'b%b, remainder=32'b%b",                      i, dividend, divisor, quotient, remainder);                     	      #20            reset = 0;	      #20            reset = 1;	         start = 1;            	      #1000	         if(quotient!=D || remainder!=R) 	         begin	             $display("BAD RESULT!!!");                $display("result: quotient=48'b%b, remainder=32'b%b", D, R);                $stop;	         end      end            $stop;   endendmodule