div_tb.v

基于srt-2算法

module div_tb;
    parameter samples = 128; //total data samples
    parameter n = 32;      //bit length, should be 32
    parameter m = 16;      //dot position
    parameter seed = 200;  //random seed
    
    wire [n+m-1:0]  quo;
    wire [n-1:0]    rem;
    reg clk,reset,start;
    wire err,ok;
    reg [n-1:0]    dividend;
    reg [n-1:0]    divisor;
    
    reg [n+m-1:0]  quotient;
    reg [n-1:0]    remainder;

    integer i;
    
    div2 #(n,m) t(.clk(clk),.reset(reset),.start(start),
              .dividend(dividend),.divisor(divisor),
              .quo(quo),.rem(rem),.err(err),.ok(ok));
    
    //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
   
   always #5 clk = ~clk; 
   
   initial begin  
      clk = 0;
      reset = 0;
	   start = 0;
	   
	   i = $random(seed);
        for(i=1; i<=samples; i=i+1) 
        begin
           {dividend, divisor, quotient, remainder} = gen_rand_data(i);
           //you can print this values to a file instead of to the console
           $display("i=%4d, dividend=%b, divisor = %b, quotient=%b, remainder=%b", 
                  i, dividend, divisor, quotient, remainder);
           
        end
         #20
            reset = 0;
	      #20
            reset = 1;
	         start = 1;
            
	      #1000
	         if(quotient!=quo || remainder!=rem) 
	         begin
	             $display("BAD RESULT!!!");
                $display("result: quotient=48'b%b, remainder=32'b%b",quo,rem);
	         end
	         else begin
	             $display("good!");
	             $display("result: quotient=48'b%b, remainder=32'b%b",quo,rem);
	             $stop;
	             end
	     $stop;
	     end  
endmodule