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// ============================================================================
//        __
//   \\__/ o\    (C) 2022  Robert Finch, Waterloo
//    \  __ /    All rights reserved.
//     \/_//     robfinch<remove>@finitron.ca
//       ||
//
//      iTodf128_tb.sv
//  - test convert integer to decimal floating point
//
// BSD 3-Clause License
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// modification, are permitted provided that the following conditions are met:
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//                                                                          
// ============================================================================

module i2df128_tb();

reg rst;
reg clk;
reg [15:0] adr;
wire [127:0] flt;
reg [7:0] count;

reg [127:0] bin;

integer outfile;

initial begin
        rst = 1'b0;
        clk = 1'b0;
        adr = 0;
        bin = $urandom(1);
        #20 rst = 1;
        #50 rst = 0;
        #10000000  $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
                        if (count==2)
                                bin[g+3:g] <= $urandom() % 16;
                end
        end
end
endgenerate

always @(posedge clk)
if (rst) begin
        adr <= 0;
        count <= 0;
end
else
begin
  if (adr==0) begin
    outfile = $fopen("f:/cores2022/float/dfpu/test_bench/i2df128_tvo.txt", "wb");
    $fwrite(outfile, "s ------ bin ------  ------ flt ------  \n");
  end
        count <= count + 1;
        if (count > 140)
                count <= 1'd1;
        if (adr==1) begin
                bin <= 128'h01;
        end
        if (adr==2) begin
                bin <= 128'h0A;
        end
        if (adr==3) begin
                bin <= 128'd100;
        end
        if (adr==4) begin
                bin <= 128'd1000;
        end
        if (adr==5) begin
                bin <= 128'd1000000;
        end
        if (adr==6) begin
                bin <= 128'd12345678;
        end
        if (count==140) begin
        $fwrite(outfile, "%c %h\t%h\n", adr[11] ? "s" : "u", bin, flt);
                adr <= adr + 1;
        end
end

i2df128 u6 (
        .rst(rst),
  .clk(clk),
  .ce(1'b1),
  .op(adr[11]),
  .rm(3'd0),
  .ld(count==3),
  .i(bin),
  .o(flt),
  .done()
);

endmodule