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[/] [qaz_libs/] [trunk/] [BFM/] [src/] [tb/] [random_delay.svh] - Blame information for rev 45

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1 45 qaztronic
//////////////////////////////////////////////////////////////////////
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////                                                              ////
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//// Copyright (C) 2018 Authors and OPENCORES.ORG                 ////
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////                                                              ////
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//// This source file may be used and distributed without         ////
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//// restriction provided that this copyright statement is not    ////
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//// removed from the file and that any derivative work contains  ////
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//// the original copyright notice and the associated disclaimer. ////
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////                                                              ////
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//// This source file is free software; you can redistribute it   ////
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//// and/or modify it under the terms of the GNU Lesser General   ////
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//// Public License as published by the Free Software Foundation; ////
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//// either version 2.1 of the License, or (at your option) any   ////
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//// later version.                                               ////
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////                                                              ////
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//// This source is distributed in the hope that it will be       ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
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//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
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//// PURPOSE.  See the GNU Lesser General Public License for more ////
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//// details.                                                     ////
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////                                                              ////
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//// You should have received a copy of the GNU Lesser General    ////
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//// Public License along with this source; if not, download it   ////
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//// from http://www.opencores.org/lgpl.shtml                     ////
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////                                                              ////
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//////////////////////////////////////////////////////////////////////
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// --------------------------------------------------------------------
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 typedef enum
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 {
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    NONE,
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    SPORADIC,
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    // BURSTY,
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    REGULAR
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 } random_delay_type_e;
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// --------------------------------------------------------------------
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class random_delay;
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  rand int unsigned delay = 0;
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  time wait_timescale = 1ns;
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  // --------------------------------------------------------------------
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  virtual function void set_delay(random_delay_type_e kind = REGULAR);
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    case(kind)
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      NONE:     delay = 0;
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      SPORADIC: assert(this.randomize() with{delay dist {0 := 96, [1:3] := 3, [4:7] := 1};});
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      REGULAR:  assert(this.randomize() with{delay dist {0 := 60, [1:3] := 30, [4:7] := 10};});
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      default:  delay = 0;
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    endcase
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  endfunction: set_delay
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  // --------------------------------------------------------------------
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  virtual task next(random_delay_type_e kind = REGULAR);
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    set_delay(kind);
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    #(delay * wait_timescale);
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  endtask: next
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  // --------------------------------------------------------------------
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  virtual function int unsigned get(random_delay_type_e kind = REGULAR);
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    set_delay(kind);
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    return(delay);
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  endfunction: get
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// --------------------------------------------------------------------
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endclass: random_delay

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