OpenCores
URL https://opencores.org/ocsvn/qaz_libs/qaz_libs/trunk

Subversion Repositories qaz_libs

[/] [qaz_libs/] [trunk/] [BFM/] [src/] [tb/] [random_delay.svh] - Rev 49

Go to most recent revision | Compare with Previous | Blame | View Log

//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2018 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                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////


// --------------------------------------------------------------------
 typedef enum
 {
    NONE,
    SPORADIC,
    // BURSTY,
    REGULAR
 } random_delay_type_e;

// --------------------------------------------------------------------
class random_delay;

  rand int unsigned delay = 0;
  time wait_timescale = 1ns;

  // --------------------------------------------------------------------
  virtual function void set_delay(random_delay_type_e kind = REGULAR);
    case(kind)
      NONE:     delay = 0;
      SPORADIC: assert(this.randomize() with{delay dist {0 := 96, [1:3] := 3, [4:7] := 1};});
      REGULAR:  assert(this.randomize() with{delay dist {0 := 60, [1:3] := 30, [4:7] := 10};});
      default:  delay = 0;
    endcase
  endfunction: set_delay

  // --------------------------------------------------------------------
  virtual task next(random_delay_type_e kind = REGULAR);
    set_delay(kind);
    #(delay * wait_timescale);
  endtask: next

  // --------------------------------------------------------------------
  virtual function int unsigned get(random_delay_type_e kind = REGULAR);
    set_delay(kind);
    return(delay);
  endfunction: get

// --------------------------------------------------------------------
endclass: random_delay

Go to most recent revision | Compare with Previous | Blame | View Log

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.