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// ============================================================================
//        __
//   \\__/ o\    (C) 2020-2022  Robert Finch, Waterloo
//    \  __ /    All rights reserved.
//     \/_//     robfinch<remove>@finitron.ca
//       ||
//
//      mult64x64_tb.sv
//
// BSD 3-Clause License
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// modification, are permitted provided that the following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice, this
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// ============================================================================

module mult64x64_tb();
reg clk;
reg [23:0] count;
reg [31:0] adr;

reg rst;
reg [63:0] a, b;
wire [127:0] o;
wire [127:0] p = a * b;

always #5 clk = ~clk;

mult64x64 u1 (clk, 1'b1, a, b, o);

integer outfile;

initial begin
        rst = 1'b0;
        clk = 1'b0;
        #20 rst = 1;
        #50 rst = 0;
        #1000000  $fclose(outfile);
        #10 $finish;
end

always #5
        clk = ~clk;

always_ff @(posedge clk)
if (rst) begin
        adr <= 0;
        count <= 0;
        a <= $urandom(1);
end
else
begin
  if (adr==0) begin
    outfile = $fopen("d:/cores2022/rf6809/rtl/fpu/test_bench/mult64x64_tvo.txt", "wb");
    $fwrite(outfile, "--- A ---  ---- B ----  - DUT Product -  - SIM Product -\n");
  end
        count <= count + 1;
        if (count > 24)
                count <= 1'd1;
        if (count==2) begin     
                case (adr)
          1:
            begin
              a <= 64'd10;
              b <= 64'd10;
            end
          2:
            begin
              a <= 64'd21;
              b <= 64'd1700000;
            end 
          3:
            begin
              a <= 64'd215000;
              b <= 64'd11;
            end
          default:
                begin
                                a[31:0] <= $urandom();
                                b[31:0] <= $urandom();
                                a[63:32] <= $urandom();
                                b[63:32] <= $urandom();
                        end
          endcase 
        end
        if (count==24) begin
          $fwrite(outfile, "%h\t%h\t%h\t%h%c\n", a, b, o, p,p!=o ? "*":" ");
                adr <= adr + 1;
        end
end

endmodule