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`timescale 1ns / 1ps

// ============================================================================

//        __

//   \\__/ o\    (C) 2006-2022  Robert Finch, Waterloo

//    \  __ /    All rights reserved.

//     \/_//     robfinch<remove>@finitron.ca

//       ||

//

//      DFPDivide128_tb.v

//              - decimal floating point divider test bench

//

// BSD 3-Clause License

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// modification, are permitted provided that the following conditions are met:

//

// 1. Redistributions of source code must retain the above copyright notice, this

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//    this list of conditions and the following disclaimer in the documentation

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//

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//                                                                          

// ============================================================================

module DFPDivide128_tb();

parameter N=34;

reg rst;

reg clk;

reg [15:0] adr;

reg [127:0] a,b;

wire [127:0] o, sqrto;

reg [3:0] rm;

wire done;

integer n;

reg [127:0] a1, b1;

reg [39:0] sum_cc;

integer outfile;

initial begin

        rst = 1'b0;

        clk = 1'b0;

        adr = 0;

        a = $urandom(1);

        b = 1;

        #20 rst = 1;

        #50 rst = 0;

        #5000000  $fclose(outfile);

        #10 $finish;

end

always #5

        clk = ~clk;

genvar g;

generate begin : gRand

        for (g = 0; g < 128; g = g + 4) begin

                always @(posedge clk) begin

                        a1[g+3:g] <= $urandom() % 16;

                        b1[g+3:g] <= $urandom() % 16;

                end

        end

end

endgenerate

reg [15:0] count;

always @(posedge clk)

if (rst) begin

        adr <= 0;

        count <= 0;

        sum_cc = 0;

end

else

begin

  if (adr==0) begin

    outfile = $fopen("d:/cores2022/rf6809/rtl/dfpu/test_bench/DFPDivide128_tvo.txt", "wb");

    $fwrite(outfile, "rm ------ A ------  ------- B ------  - DUT Quotient - - Square root -\n");

    sum_cc = 0;

  end

        count <= count + 1;

        if (count > 2000)

                count <= 1'd1;

        if (count==2) begin

                a <= a1;

                b <= b1;

                rm <= adr[15:13];

                //ad <= memd[adr][63: 0];

                //bd <= memd[adr][127:64];

        end

        if (adr==1 && count==2) begin

                a <= 128'h25ffc000000000000000000000000000;     // 1

                b <= 128'h25ffc000000000000000000000000000;     // 1

        end

        if (adr==2 && count==2) begin

                a <= 128'h26000000000000000000000000000000;     // 10

                b <= 128'h26000000000000000000000000000000;     // 10

        end

        if (adr==3 && count==2) begin

                a <= 128'h26004000000000000000000000000000;     // 100

                b <= 128'h26000000000000000000000000000000;     // 10

        end

        if (adr==4 && count==2) begin

                a <= 128'h26008000000000000000000000000000;     // 1000

                a <= 128'h26004000000000000000000000000000;     // 100

        end

        if (adr==5 && count==2) begin

                a <= 128'h2601934B9C0C00000000000000000000;     // 12345678

                b <= 128'h26000000000000000000000000000000;     // 10

        end

        if (count > 2000) begin

                sum_cc = sum_cc + u6.u1.u2.clkcnt;

          $fwrite(outfile, "%h\t%h\t%h\t%h\t%h\t%d\t%f\n", rm, a, b, o, sqrto, u6.u1.u2.clkcnt, $itor(sum_cc) / $itor(adr));

                adr <= adr + 1;

        end

end

//fpMulnr #(64) u1 (clk, 1'b1, a, b, o, rm);//, sign_exe, inf, overflow, underflow);

DFPDivide128nr #(.N(N)) u6 (

  .rst(rst),

  .clk(clk),

  .ce(1'b1),

  .ld(count==3),

  .op(1'b0),

  .a(a),

  .b(b),

  .o(o),

  .rm(rm),

  .done(done),

  .sign_exe(),

  .inf(),

  .overflow(),

  .underflow()

);

//DFPSqrt128nr #(.N(N)) u1 (rst, clk, 1'b1, count==3, a, sqrto, rm);//, sign_exe, inf, overflow, underflow);

endmodule