Subversion Repositories wb4pb

////////////////////////////////////////////////////////////////////////////////

// This sourcecode is released under BSD license.

// Please see http://www.opensource.org/licenses/bsd-license.php for details!

////////////////////////////////////////////////////////////////////////////////

//

// Copyright (c) 2010, Stefan Fischer <Ste.Fis@OpenCores.org>

// All rights reserved.

//

// Redistribution and use in source and binary forms, with or without 

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

//

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//    this list of conditions and the following disclaimer.

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//  * Neither the name of the author nor the names of his contributors may be 

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//

////////////////////////////////////////////////////////////////////////////////

// filename: picoblaze_wb_gpio_tb.v

// description: testbench for picoblaze_wb_gpio example

// todo4user: modify stimulus as needed

// version: 0.0.0

// changelog: - 0.0.0, initial release

//            - ...

////////////////////////////////////////////////////////////////////////////////

`uselib lib = unisims_ver

`timescale 1 ns / 1 ps

module picoblaze_wb_gpio_tb;

  reg rst_n;

  reg clk;

  wire[7:0] gpio;

  parameter PERIOD = 20;

  reg[7:4] test_data_in;

  // system signal generation

  initial begin

    test_data_in = 4'h0;

    clk = 1'b1;

    rst_n = 1'b0;

    #(PERIOD*2) rst_n = 1'b1;

  end

  always #(PERIOD/2) clk = ! clk;

  // 4 bit counting data, changing after some micro seconds

  always #3000 test_data_in = test_data_in + 1;

  // stimulus at upper gpio nibble

  assign gpio[7:4] = test_data_in;

  // design under test instance

  picoblaze_wb_gpio dut (

    .p_rst_n_i(rst_n),

    .p_clk_i(clk),

    .p_gpio_io(gpio)

  );

endmodule