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[/] [qaz_libs/] [trunk/] [BFM/] [src/] [tb/] [tb_clk_pkg.sv] - Rev 34

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//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2015 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// 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                     ////
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//////////////////////////////////////////////////////////////////////

`timescale 1ps/1ps


// --------------------------------------------------------------------
//
interface tb_clk_if;
  logic clk = 0;
  logic enable = 0;
  time period;
  event clk_rise;
  event clk_fall;
  
  modport tb_m
  (
    output clk
  );
endinterface: tb_clk_if


// --------------------------------------------------------------------
//
package tb_clk_pkg;

  // --------------------------------------------------------------------
  //
  class
    tb_clk_class;
    
    virtual tb_clk_if tb;

    // --------------------------------------------------------------------
    //
    function
      new
      (
        virtual tb_clk_if tb
      );
      
      this.tb = tb;
    endfunction: new
    

    // --------------------------------------------------------------------
    //
    task
      init_basic_clock
      (
        time period
      );
      
      tb.period = period;
      tb.enable = 1;
      
      $display( "^^^ %16.t | %m | Starting clock with period %t.", $time, period );
      
      fork
        forever
          if( tb.enable )
            begin
              #(period/2) tb.clk = 1;
              -> tb.clk_rise;
              #(period/2) tb.clk = 0;
              -> tb.clk_fall;
            end
      join_none
      
    endtask: init_basic_clock
    
    
    // --------------------------------------------------------------------
    //
    task
      enable_clock
      (
        logic enable
      );
      
      tb.enable = enable;
      
      $display( "^^^ %16.t | %m | Clock Enable =  %h.", $time, enable );
      
    endtask: enable_clock
    
  // --------------------------------------------------------------------
  //
  endclass: tb_clk_class
  
//--------------------------------------------------------------------
//
endpackage: tb_clk_pkg

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