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[/] [qaz_libs/] [trunk/] [BFM/] [src/] [tb/] [random_delay.svh] - Rev 46
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//////////////////////////////////////////////////////////////////////
//// ////
//// 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
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