Subversion Repositories gng

//------------------------------------------------------------------------------

//

// tb_gng.sv

//

// This file is part of the Gaussian Noise Generator IP Core

//

// Description

//     Systemverilog testbench for module gng. Generate noise sequences of

// length N and output to file.

//

//------------------------------------------------------------------------------

//

// Copyright (C) 2014, Guangxi Liu 

//

// This source file may be used and distributed without restriction provided

// that this copyright statement is not removed from the file and that any

// derivative work contains the original copyright notice and the associated

// disclaimer.

//

// This source file is free software; you can redistribute it and/or modify it

// under the terms of the GNU Lesser General Public License as published by

// the Free Software Foundation; either version 2.1 of the License,

// or (at your option) any later version.

//

// This source is distributed in the hope that it will be useful, but

// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY

// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public

// License for more details.

//

// You should have received a copy of the GNU Lesser General Public License

// along with this source; if not, download it from

// http://www.opencores.org/lgpl.shtml

//

//------------------------------------------------------------------------------

`timescale 1 ns / 1 ps

module tb_gng;

// Parameters

parameter ClkPeriod = 10.0;

parameter N = 1000000;

// Local variables

logic clk;

logic rstn;

logic ce;

logic valid_out;

logic [15:0] data_out;

// Instances

gng #(

   .INIT_Z1(64'd5030521883283424767),

   .INIT_Z2(64'd18445829279364155008),

   .INIT_Z3(64'd18436106298727503359)

)

u_gng (.*);

// System signals

initial begin

    clk <= 1'b0;

    forever #(ClkPeriod/2) clk = ~clk;

end

initial begin

    rstn <= 1'b0;

    #(ClkPeriod*2) rstn = 1'b1;

end

// Main process

int fpOut;

initial begin

    fpOut = $fopen("gng_data_out.txt", "w");

    ce = 0;

    #(ClkPeriod*10)

    repeat (N) begin

        @(posedge clk);

        ce = 1;

    end

    @(posedge clk);

    ce = 0;

    #(ClkPeriod*20)

    $fclose(fpOut);

    $stop;

end

// Record data

always_ff @ (negedge clk) begin

    if (valid_out)

        $fwrite(fpOut, "%0d\n", $signed(data_out));

end

endmodule