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RandomPkg2019.vhd
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RandomPkg2019.vhd
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--
-- File Name : RandomPkg2019.vhd
-- Design Unit Name : RandomPkg2019
-- Revision : STANDARD VERSION
--
-- Maintainer : Jim Lewis email : jim@synthworks.com
-- Contributor(s) :
-- Jim Lewis email: jim@synthworks.com
-- Lars Asplund email: lars.anders.asplund@gmail.com - RandBool, RandSl, RandBit, DistBool, DistSl, DistBit
-- *
--
-- * In writing procedures normal, poisson, the following sources were referenced :
-- Wikipedia
-- package rnd2 written by John Breen and Ken Christensen
-- package RNG written by Gnanasekaran Swaminathan
--
--
-- Description :
-- RandomPType, a protected type, defined to hold randomization RandomSeeds and
-- function methods to facilitate randomization with uniform and weighted
-- distributions
--
-- Developed for :
-- SynthWorks Design Inc.
-- VHDL Training Classes
-- 11898 SW 128th Ave. Tigard, Or 97223
-- http ://www.SynthWorks.com
--
-- Revision History :
-- Date Version Description
-- 09/2024 2024.09 Derived from RandomPkg
--
-- This file is part of OSVVM.
--
-- Copyright (c) 2006 - 2024 by SynthWorks Design Inc.
-- Copyright (C) 2021 - 2024 by OSVVM Authors
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
-- https://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
--
use work.OsvvmGlobalPkg.all ;
use work.AlertLogPkg.all ;
use work.RandomBasePkg.all ;
use work.SortListPkg_int.all ;
use work.OsvvmSettingsPkg.all ;
use std.textio.all ;
library ieee ;
use ieee.std_logic_1164.all ;
use ieee.numeric_std.all ;
use ieee.numeric_std_unsigned.all ;
use ieee.math_real.all ;
package RandomPkg2019 is
-- Supports DistValInt functionality
type DistRecType is record
Value : integer ;
Weight : integer ;
end record ;
type DistType is array (natural range <>) of DistRecType ;
type RandomType is record
Seed : RandomSeedType ;
Param : RandomParamType ;
end record ;
-- Weight vectors not indexed by integers
type NaturalVBoolType is array (boolean range <>) of natural;
type NaturalVSlType is array (std_logic range <>) of natural;
type NaturalVBitType is array (bit range <>) of natural;
procedure InitSeed (variable RV : inout RandomType ; S : string ) ;
procedure InitSeed (variable RV : inout RandomType ; I : integer ) ;
procedure InitSeed (variable RV : inout RandomType ; T : time ) ;
procedure InitSeed (variable RV : inout RandomType ; IV : integer_vector) ;
impure function InitSeed ( S : string ) return RandomType ;
impure function InitSeed ( I : integer ) return RandomType ;
impure function InitSeed ( T : time ) return RandomType ;
impure function InitSeed ( IV : integer_vector ) return RandomType ;
alias InitSeed is GenRandSeed[string return RandomSeedType] ;
alias InitSeed is GenRandSeed[integer return RandomSeedType] ;
alias InitSeed is GenRandSeed[time return RandomSeedType] ;
alias InitSeed is GenRandSeed[integer_vector return RandomSeedType] ;
-- Save and restore seed values
impure function SetSeed (RandomSeedIn : RandomSeedType) return RandomType ;
impure function GetSeed (RV : RandomType) return RandomSeedType ;
alias SeedRandom is SetSeed [RandomSeedType return RandomType] ;
alias SeedRandom is GetSeed [RandomType return RandomSeedType] ;
------------------------------------------------------------
-- Setting Randomization Parameters
------------------------------------------------------------
procedure SetRandomParam (variable RV : inout RandomType ; RandomParamIn : RandomParamType) ;
procedure SetRandomParam (
variable RV : inout RandomType ;
Distribution : RandomDistType ;
Mean : Real := 0.0 ;
Deviation : Real := 0.0
) ;
impure function GetRandomParam (variable RV : inout RandomType) return RandomParamType ;
impure function GetRandomParam (variable RV : inout RandomType) return RandomDistType ;
-- For compatibility with previous version - replace with alias
alias SetRandomParm is SetRandomParam [RandomType, RandomParamType] ;
alias SetRandomParm is SetRandomParam [RandomType, RandomDistType, Real, Real] ;
alias GetRandomParm is GetRandomParam [RandomType return RandomParamType] ;
alias GetRandomParm is GetRandomParam [RandomType return RandomDistType] ;
alias SetRandomMode is SetRandomParam [RandomType, RandomDistType, Real, Real] ;
--- ///////////////////////////////////////////////////////////////////////////
---
--- Base Randomization Distributions
---
--- ///////////////////////////////////////////////////////////////////////////
------------------------------------------------------------
--
-- Uniform
-- Generate a random number with a Uniform distribution
--
------------------------------------------------------------
impure function Uniform (variable RV : inout RandomType ; Min, Max : in real) return real ;
impure function Uniform (variable RV : inout RandomType ; Min, Max : integer) return integer ;
impure function Uniform (variable RV : inout RandomType ; Min, Max : integer ; Exclude : integer_vector) return integer ;
------------------------------------------------------------
--
-- FavorSmall
-- Generate random numbers with a greater number of small
-- values than large values
--
------------------------------------------------------------
impure function FavorSmall (variable RV : inout RandomType ; Min, Max : real) return real ;
impure function FavorSmall (variable RV : inout RandomType ; Min, Max : integer) return integer ;
impure function FavorSmall (variable RV : inout RandomType ; Min, Max : integer ; Exclude : integer_vector) return integer ;
------------------------------------------------------------
--
-- FavorBig
-- Generate random numbers with a greater number of large
-- values than small values
--
------------------------------------------------------------
impure function FavorBig (variable RV : inout RandomType ; Min, Max : real) return real ;
impure function FavorBig (variable RV : inout RandomType ; Min, Max : integer) return integer ;
impure function FavorBig (variable RV : inout RandomType ; Min, Max : integer ; Exclude : integer_vector) return integer ;
-----------------------------------------------------------------
--
-- Normal
-- Generate a random number with a normal distribution
-- Uses Box Muller, per Wikipedia
--
------------------------------------------------------------
impure function Normal (variable RV : inout RandomType ; Mean, StdDeviation : real) return real ;
impure function Normal (variable RV : inout RandomType ; Mean, StdDeviation, Min, Max : real) return real ;
impure function Normal (
variable RV : inout RandomType ;
Mean : real ;
StdDeviation : real ;
Min : integer ;
Max : integer ;
Exclude : integer_vector := NULL_INTV
) return integer ;
-----------------------------------------------------------------
-- Poisson
-- Generate a random number with a poisson distribution
-- Discrete distribution = only generates integral values
-- Uses knuth method, per Wikipedia
--
------------------------------------------------------------
impure function Poisson (variable RV : inout RandomType ; Mean : real) return real ;
impure function Poisson (variable RV : inout RandomType ; Mean, Min, Max : real) return real ;
impure function Poisson (
variable RV : inout RandomType ;
Mean : real ;
Min : integer ;
Max : integer ;
Exclude : integer_vector := NULL_INTV
) return integer ;
--- ///////////////////////////////////////////////////////////////////////////
--
-- Randomization with range.
-- Uses internal settings of RandomParm to deterimine distribution.
--
--- ///////////////////////////////////////////////////////////////////////////
------------------------------------------------------------
impure function RandInt (variable RV : inout RandomType ; Min, Max : integer) return integer ;
impure function RandReal (variable RV : inout RandomType ; Min, Max : Real) return real ;
impure function RandTime (variable RV : inout RandomType ; Min, Max : time ; Unit : time := ns) return time ;
impure function RandSlv (variable RV : inout RandomType ; Min, Max, Size : natural) return std_logic_vector ;
impure function RandUnsigned (variable RV : inout RandomType ; Min, Max, Size : natural) return Unsigned ;
impure function RandSigned (variable RV : inout RandomType ; Min, Max : integer ; Size : natural) return Signed ;
impure function RandIntV (variable RV : inout RandomType ; Min, Max : integer ; Size : natural) return integer_vector ;
impure function RandIntV (variable RV : inout RandomType ; Min, Max : integer ; Unique : natural ; Size : natural) return integer_vector ;
impure function RandRealV (variable RV : inout RandomType ; Min, Max : real ; Size : natural) return real_vector ;
impure function RandTimeV (variable RV : inout RandomType ; Min, Max : time ; Size : natural ; Unit : time := ns) return time_vector ;
impure function RandTimeV (variable RV : inout RandomType ; Min, Max : time ; Unique : natural ; Size : natural ; Unit : time := ns) return time_vector ;
--- ///////////////////////////////////////////////////////////////////////////
--
-- Randomization with range and exclude vector.
-- Uses internal settings of RandomParm to deterimine distribution.
--
--- ///////////////////////////////////////////////////////////////////////////
------------------------------------------------------------
impure function RandInt (variable RV : inout RandomType ; Min, Max : integer ; Exclude : integer_vector ) return integer ;
impure function RandTime (variable RV : inout RandomType ; Min, Max : time ; Exclude : time_vector ; Unit : time := ns) return time ;
impure function RandSlv (variable RV : inout RandomType ; Min, Max : natural ; Exclude : integer_vector ; Size : natural) return std_logic_vector ;
impure function RandUnsigned (variable RV : inout RandomType ; Min, Max : natural ; Exclude : integer_vector ; Size : natural) return Unsigned ;
impure function RandSigned (variable RV : inout RandomType ; Min, Max : integer ; Exclude : integer_vector ; Size : natural) return Signed ;
impure function RandIntV (variable RV : inout RandomType ; Min, Max : integer ; Exclude : integer_vector ; Size : natural) return integer_vector ;
impure function RandIntV (variable RV : inout RandomType ; Min, Max : integer ; Exclude : integer_vector ; Unique : natural ; Size : natural) return integer_vector ;
impure function RandTimeV (variable RV : inout RandomType ; Min, Max : time ; Exclude : time_vector ; Size : natural ; Unit : in time := ns) return time_vector ;
impure function RandTimeV (variable RV : inout RandomType ; Min, Max : time ; Exclude : time_vector ; Unique : natural ; Size : natural ; Unit : in time := ns) return time_vector ;
--- ///////////////////////////////////////////////////////////////////////////
--
-- Randomly select a value within a set of values
-- Uses internal settings of RandomParm to deterimine distribution.
--
--- ///////////////////////////////////////////////////////////////////////////
------------------------------------------------------------
impure function RandInt (variable RV : inout RandomType ; A : integer_vector ) return integer ;
impure function RandReal (variable RV : inout RandomType ; A : real_vector ) return real ;
impure function RandTime (variable RV : inout RandomType ; A : time_vector ) return time ;
impure function RandSlv (variable RV : inout RandomType ; A : integer_vector ; Size : natural) return std_logic_vector ;
impure function RandUnsigned (variable RV : inout RandomType ; A : integer_vector ; Size : natural) return Unsigned ;
impure function RandSigned (variable RV : inout RandomType ; A : integer_vector ; Size : natural) return Signed ;
impure function RandIntV (variable RV : inout RandomType ; A : integer_vector ; Size : natural) return integer_vector ;
impure function RandIntV (variable RV : inout RandomType ; A : integer_vector ; Unique : natural ; Size : natural) return integer_vector ;
impure function RandRealV (variable RV : inout RandomType ; A : real_vector ; Size : natural) return real_vector ;
impure function RandRealV (variable RV : inout RandomType ; A : real_vector ; Unique : natural ; Size : natural) return real_vector ;
impure function RandTimeV (variable RV : inout RandomType ; A : time_vector ; Size : natural) return time_vector ;
impure function RandTimeV (variable RV : inout RandomType ; A : time_vector ; Unique : natural ; Size : natural) return time_vector ;
--- ///////////////////////////////////////////////////////////////////////////
--
-- Randomly select a value within a set of values with exclude values (so can skip last or last n)
-- Uses internal settings of RandomParm to deterimine distribution.
--
--- ///////////////////////////////////////////////////////////////////////////
------------------------------------------------------------
impure function RandInt (variable RV : inout RandomType ; A, Exclude : integer_vector ) return integer ;
impure function RandReal (variable RV : inout RandomType ; A, Exclude : real_vector ) return real ;
impure function RandTime (variable RV : inout RandomType ; A, Exclude : time_vector ) return time ;
impure function RandSlv (variable RV : inout RandomType ; A, Exclude : integer_vector ; Size : natural) return std_logic_vector ;
impure function RandUnsigned (variable RV : inout RandomType ; A, Exclude : integer_vector ; Size : natural) return Unsigned ;
impure function RandSigned (variable RV : inout RandomType ; A, Exclude : integer_vector ; Size : natural ) return Signed ;
impure function RandIntV (variable RV : inout RandomType ; A, Exclude : integer_vector ; Size : natural) return integer_vector ;
impure function RandIntV (variable RV : inout RandomType ; A, Exclude : integer_vector ; Unique : natural ; Size : natural) return integer_vector ;
impure function RandRealV (variable RV : inout RandomType ; A, Exclude : real_vector ; Size : natural) return real_vector ;
impure function RandRealV (variable RV : inout RandomType ; A, Exclude : real_vector ; Unique : natural ; Size : natural) return real_vector ;
impure function RandTimeV (variable RV : inout RandomType ; A, Exclude : time_vector ; Size : natural) return time_vector ;
impure function RandTimeV (variable RV : inout RandomType ; A, Exclude : time_vector ; Unique : natural ; Size : natural) return time_vector ;
--- ///////////////////////////////////////////////////////////////////////////
--
-- Basic Discrete Distributions
-- Randomly select between 0 and N-1 based on the specified weight.
-- where N = number values in weight array
-- Always uses Uniform
--
--- ///////////////////////////////////////////////////////////////////////////
------------------------------------------------------------
impure function DistInt (variable RV : inout RandomType ; Weight : integer_vector ) return integer ;
impure function DistSlv (variable RV : inout RandomType ; Weight : integer_vector ; Size : natural ) return std_logic_vector ;
impure function DistUnsigned (variable RV : inout RandomType ; Weight : integer_vector ; Size : natural ) return unsigned ;
impure function DistSigned (variable RV : inout RandomType ; Weight : integer_vector ; Size : natural ) return signed ;
impure function DistBool (variable RV : inout RandomType ; Weight : NaturalVBoolType ) return boolean ;
impure function DistSl (variable RV : inout RandomType ; Weight : NaturalVSlType ) return std_logic ;
impure function DistBit (variable RV : inout RandomType ; Weight : NaturalVBitType ) return bit ;
--- ///////////////////////////////////////////////////////////////////////////
--
-- Basic Distributions with exclude values (so can skip last or last n)
-- Always uses Uniform via DistInt
--
--- ///////////////////////////////////////////////////////////////////////////
------------------------------------------------------------
impure function DistInt (variable RV : inout RandomType ; Weight : integer_vector ; Exclude : integer_vector ) return integer ;
impure function DistSlv (variable RV : inout RandomType ; Weight : integer_vector ; Exclude : integer_vector ; Size : natural ) return std_logic_vector ;
impure function DistUnsigned (variable RV : inout RandomType ; Weight : integer_vector ; Exclude : integer_vector ; Size : natural ) return unsigned ;
impure function DistSigned (variable RV : inout RandomType ; Weight : integer_vector ; Exclude : integer_vector ; Size : natural ) return signed ;
--- ///////////////////////////////////////////////////////////////////////////
--
-- Distribution for sparse values
-- Specify weight and value
-- Always uses Uniform via DistInt
--
--- ///////////////////////////////////////////////////////////////////////////
------------------------------------------------------------
impure function DistValInt (variable RV : inout RandomType ; A : DistType ) return integer ;
impure function DistValSlv (variable RV : inout RandomType ; A : DistType ; Size : natural) return std_logic_vector ;
impure function DistValUnsigned (variable RV : inout RandomType ; A : DistType ; Size : natural) return unsigned ;
impure function DistValSigned (variable RV : inout RandomType ; A : DistType ; Size : natural) return signed ;
--- ///////////////////////////////////////////////////////////////////////////
--
-- Distribution for sparse values with exclude values (so can skip last or last n)
-- Specify weight and value
-- Always uses Uniform via DistInt
--
--- ///////////////////////////////////////////////////////////////////////////
------------------------------------------------------------
impure function DistValInt (variable RV : inout RandomType ; A : DistType ; Exclude : integer_vector ) return integer ;
impure function DistValSlv (variable RV : inout RandomType ; A : DistType ; Exclude : integer_vector ; Size : natural) return std_logic_vector ;
impure function DistValUnsigned (variable RV : inout RandomType ; A : DistType ; Exclude : integer_vector ; Size : natural) return unsigned ;
impure function DistValSigned (variable RV : inout RandomType ; A : DistType ; Exclude : integer_vector ; Size : natural) return signed ;
--- ///////////////////////////////////////////////////////////////////////////
--
-- Large vector handling.
--
--- ///////////////////////////////////////////////////////////////////////////
------------------------------------------------------------
impure function RandUnsigned (variable RV : inout RandomType ; Size : natural) return unsigned ;
impure function RandSlv (variable RV : inout RandomType ; Size : natural) return std_logic_vector ;
impure function RandSigned (variable RV : inout RandomType ; Size : natural) return signed ;
impure function RandUnsigned (variable RV : inout RandomType ; Max : Unsigned) return unsigned ;
impure function RandSlv (variable RV : inout RandomType ; Max : std_logic_vector) return std_logic_vector ;
impure function RandSigned (variable RV : inout RandomType ; Max : signed) return signed ;
impure function RandUnsigned (variable RV : inout RandomType ; Min, Max : unsigned) return unsigned ;
impure function RandSlv (variable RV : inout RandomType ; Min, Max : std_logic_vector) return std_logic_vector ;
impure function RandSigned (variable RV : inout RandomType ; Min, Max : signed) return signed ;
--- ///////////////////////////////////////////////////////////////////////////
--
-- Convenience Functions. Resolve into calls into the other functions
--
--- ///////////////////////////////////////////////////////////////////////////
------------------------------------------------------------
impure function RandReal (variable RV : inout RandomType ) return real ; -- 0.0 to 1.0
impure function RandReal (variable RV : inout RandomType ; Max : Real) return real ; -- 0.0 to Max
impure function RandInt (variable RV : inout RandomType ) return integer ;
impure function RandInt (variable RV : inout RandomType ; Max : integer) return integer ;
impure function RandSlv (variable RV : inout RandomType ; Max, Size : natural) return std_logic_vector ;
impure function RandUnsigned (variable RV : inout RandomType ; Max, Size : natural) return Unsigned ;
impure function RandSigned (variable RV : inout RandomType ; Max : integer ; Size : natural ) return Signed ;
impure function RandBool (variable RV : inout RandomType ) return boolean;
impure function RandSl (variable RV : inout RandomType ) return std_logic;
impure function RandBit (variable RV : inout RandomType ) return bit;
end RandomPkg2019 ;
--- ///////////////////////////////////////////////////////////////////////////
--- ///////////////////////////////////////////////////////////////////////////
--- ///////////////////////////////////////////////////////////////////////////
package body RandomPkg2019 is
-----------------------------------------------------------------
-- Local Randomization Support
-----------------------------------------------------------------
constant NULL_SLV : std_logic_vector (NULL_RANGE_TYPE) := (others => '0') ;
constant NULL_UV : unsigned (NULL_RANGE_TYPE) := (others => '0') ;
constant NULL_SV : signed (NULL_RANGE_TYPE) := (others => '0') ;
--- ///////////////////////////////////////////////////////////////////////////
---
--- Base Call to Uniform. Use this one rather than RandomBasePkg
---
--- ///////////////////////////////////////////////////////////////////////////
--!! -----------------------------------------------------------------
--!! impure function Uniform return real is
--!! -----------------------------------------------------------------
--!! variable rRandom : real ;
--!! begin
--!! ieee.math_real.Uniform (RandomSeed(RandomSeed'left), RandomSeed(RandomSeed'right), rRandom) ;
--!! return rRandom ;
--!! end function Uniform ;
-----------------------------------------------------------------
impure function Uniform (variable RV : inout RandomType) return real is
-----------------------------------------------------------------
variable Result : real ;
begin
ieee.math_real.Uniform (RV.Seed(RV.Seed'left), RV.Seed(RV.Seed'right), Result) ;
return result ;
end function Uniform ;
--- ///////////////////////////////////////////////////////////////////////////
---
--- Seed Manipulation
---
--- ///////////////////////////////////////////////////////////////////////////
------------------------------------------------------------
procedure InitSeed ( variable RV : inout RandomType ; S : string ) is
------------------------------------------------------------
begin
RV.Seed := GenRandSeed(S) ;
end procedure InitSeed ;
------------------------------------------------------------
procedure InitSeed ( variable RV : inout RandomType ; I : integer ) is
------------------------------------------------------------
begin
RV.Seed := GenRandSeed(I) ;
end procedure InitSeed ;
------------------------------------------------------------
procedure InitSeed ( variable RV : inout RandomType ; T : time ) is
------------------------------------------------------------
begin
RV.Seed := GenRandSeed(T) ;
end procedure InitSeed ;
------------------------------------------------------------
procedure InitSeed ( variable RV : inout RandomType ; IV : integer_vector ) is
------------------------------------------------------------
begin
RV.Seed := GenRandSeed(IV) ;
end procedure InitSeed ;
------------------------------------------------------------
impure function InitSeed ( S : string ) return RandomType is
------------------------------------------------------------
variable RV : RandomType ;
begin
RV.Seed := GenRandSeed(S) ;
return RV ;
end function InitSeed ;
------------------------------------------------------------
impure function InitSeed ( I : integer ) return RandomType is
------------------------------------------------------------
variable RV : RandomType ;
begin
RV.Seed := GenRandSeed(I) ;
return RV ;
end function InitSeed ;
------------------------------------------------------------
impure function InitSeed ( T : time ) return RandomType is
------------------------------------------------------------
variable RV : RandomType ;
begin
RV.Seed := GenRandSeed(T) ;
return RV ;
end function InitSeed ;
------------------------------------------------------------
impure function InitSeed ( IV : integer_vector ) return RandomType is
------------------------------------------------------------
variable RV : RandomType ;
begin
RV.Seed := GenRandSeed(IV) ;
return RV ;
end function InitSeed ;
------------------------------------------------------------
impure function SetSeed (RandomSeedIn : RandomSeedType) return RandomType is
------------------------------------------------------------
variable RV : RandomType ;
begin
RV.Seed := RandomSeedIn ;
return RV ;
end function SetSeed ;
------------------------------------------------------------
impure function GetSeed (RV : RandomType) return RandomSeedType is
------------------------------------------------------------
begin
return RV.Seed ;
end function GetSeed ;
--- ///////////////////////////////////////////////////////////////////////////
---
--- Setting Randomization Parameters
---
--- ///////////////////////////////////////////////////////////////////////////
------------------------------------------------------------
procedure SetRandomParam (variable RV : inout RandomType ; RandomParamIn : RandomParamType) is
------------------------------------------------------------
begin
RV.Param := RandomParamIn ;
end procedure SetRandomParam ;
------------------------------------------------------------
procedure SetRandomParam (
------------------------------------------------------------
variable RV : inout RandomType ;
Distribution : RandomDistType ;
Mean : Real := 0.0 ;
Deviation : Real := 0.0
) is
begin
RV.Param := RandomParmType'(Distribution, Mean, Deviation) ;
end procedure SetRandomParam ;
------------------------------------------------------------
impure function GetRandomParam (variable RV : inout RandomType) return RandomParamType is
------------------------------------------------------------
begin
return RV.Param ;
end function GetRandomParam ;
------------------------------------------------------------
impure function GetRandomParam (variable RV : inout RandomType) return RandomDistType is
------------------------------------------------------------
begin
return RV.Param.Distribution ;
end function GetRandomParam ;
--- ///////////////////////////////////////////////////////////////////////////
---
--- Check ranges for Randomization and Generate FAILURE
---
--- ///////////////////////////////////////////////////////////////////////////
------------------------------------------------------------
-- PT Local
impure function CheckMinMax(
------------------------------------------------------------
constant Name : in string ;
constant Min : in real ;
constant Max : in real
) return real is
begin
if Min > Max then
Alert(OSVVM_RANDOM_ALERTLOG_ID,
"RandomPkg2019." & Name &
": Min: " & to_string(Min, 2) &
" > Max: " & to_string(Max, 2),
FAILURE ) ;
return Min ;
else
return Max ;
end if;
end function CheckMinMax ;
------------------------------------------------------------
-- PT Local
impure function CheckMinMax(
------------------------------------------------------------
constant Name : in string ;
constant Min : in integer ;
constant Max : in integer
) return integer is
begin
if Min > Max then
Alert(OSVVM_RANDOM_ALERTLOG_ID,
"RandomPkg2019." & Name &
": Min: " & to_string(Min) &
" > Max: " & to_string(Max),
FAILURE ) ;
return Min ;
else
return Max ;
end if;
end function CheckMinMax ;
------------------------------------------------------------
-- PT Local
impure function CheckMinMax(
------------------------------------------------------------
constant Name : in string ;
constant Min : in time ;
constant Max : in time
) return time is
begin
if Min > Max then
Alert(OSVVM_RANDOM_ALERTLOG_ID,
"RandomPkg2019." & Name &
": Min: " & to_string(Min, ns) &
" > Max: " & to_string(Max, ns),
FAILURE ) ;
return Min ;
else
return Max ;
end if;
end function CheckMinMax ;
--- ///////////////////////////////////////////////////////////////////////////
---
--- Base Randomization Distributions
---
--- ///////////////////////////////////////////////////////////////////////////
------------------------------------------------------------
--
-- Uniform
-- Generate a random number with a Uniform distribution
--
------------------------------------------------------------
impure function LocalUniform (variable RV : inout RandomType ; Min, Max : in real) return real is
------------------------------------------------------------
begin
return scale(Uniform(RV), Min, Max) ;
end function LocalUniform ;
------------------------------------------------------------
impure function Uniform (variable RV : inout RandomType ; Min, Max : in real) return real is
------------------------------------------------------------
constant CkMax : real := CheckMinMax("Uniform", Min, Max) ;
begin
return LocalUniform(RV, Min, CkMax) ;
end function Uniform ;
------------------------------------------------------------
impure function LocalUniform (variable RV : inout RandomType ; Min, Max : integer) return integer is
------------------------------------------------------------
begin
return scale(Uniform(RV), Min, Max) ;
end function LocalUniform ;
------------------------------------------------------------
impure function Uniform (variable RV : inout RandomType ; Min, Max : integer) return integer is
------------------------------------------------------------
constant CkMax : integer := CheckMinMax("Uniform", Min, Max) ;
begin
return LocalUniform(RV, Min, CkMax) ;
end function Uniform ;
------------------------------------------------------------
impure function LocalUniform (variable RV : inout RandomType ; Min, Max : integer ; Exclude : integer_vector) return integer is
------------------------------------------------------------
variable iRandomVal : integer ;
variable ExcludeList : SortListPType ;
variable count : integer ;
begin
ExcludeList.add(Exclude, Min, Max) ;
count := ExcludeList.count ;
iRandomVal := Uniform(RV, Min, Max - count) ;
-- adjust count, note iRandomVal changes while checking.
for i in 1 to count loop
exit when iRandomVal < ExcludeList.Get(i) ;
iRandomVal := iRandomVal + 1 ;
end loop ;
ExcludeList.erase ;
return iRandomVal ;
end function LocalUniform ;
------------------------------------------------------------
impure function Uniform (variable RV : inout RandomType ; Min, Max : integer ; Exclude : integer_vector) return integer is
------------------------------------------------------------
constant CkMax : integer := CheckMinMax("Uniform", Min, Max) ;
begin
return LocalUniform (RV, Min, CkMax, Exclude) ;
end function Uniform ;
------------------------------------------------------------
--
-- FavorSmall
-- Generate random numbers with a greater number of small
-- values than large values
--
------------------------------------------------------------
impure function FavorSmall (variable RV : inout RandomType ; Min, Max : real) return real is
------------------------------------------------------------
constant CkMax : real := CheckMinMax("FavorSmall", Min, Max) ;
begin
return scale(FavorSmall(Uniform(RV)), Min, CkMax) ; -- real
end function FavorSmall ;
------------------------------------------------------------
impure function FavorSmall (variable RV : inout RandomType ; Min, Max : integer) return integer is
------------------------------------------------------------
constant CkMax : integer := CheckMinMax("FavorSmall", Min, Max) ;
begin
return scale(FavorSmall(Uniform(RV)), Min, CkMax) ; -- integer
end function FavorSmall ;
------------------------------------------------------------
impure function FavorSmall (variable RV : inout RandomType ; Min, Max : integer ; Exclude : integer_vector) return integer is
------------------------------------------------------------
variable iRandomVal : integer ;
variable ExcludeList : SortListPType ;
variable count : integer ;
constant CkMax : integer := CheckMinMax("FavorSmall", Min, Max) ;
begin
ExcludeList.add(Exclude, Min, CkMax) ;
count := ExcludeList.count ;
iRandomVal := FavorSmall(RV, Min, CkMax - count) ;
-- adjust count, note iRandomVal changes while checking.
for i in 1 to count loop
exit when iRandomVal < ExcludeList.Get(i) ;
iRandomVal := iRandomVal + 1 ;
end loop ;
ExcludeList.erase ;
return iRandomVal ;
end function FavorSmall ;
------------------------------------------------------------
--
-- FavorBig
-- Generate random numbers with a greater number of large
-- values than small values
--
------------------------------------------------------------
impure function FavorBig (variable RV : inout RandomType ; Min, Max : real) return real is
------------------------------------------------------------
constant CkMax : real := CheckMinMax("FavorBig", Min, Max) ;
begin
return scale(FavorBig(Uniform(RV)), Min, CkMax) ; -- real
end function FavorBig ;
------------------------------------------------------------
impure function FavorBig (variable RV : inout RandomType ; Min, Max : integer) return integer is
------------------------------------------------------------
constant CkMax : integer := CheckMinMax("FavorBig", Min, Max) ;
begin
return scale(FavorBig(Uniform(RV)), Min, CkMax) ; -- integer
end function FavorBig ;
------------------------------------------------------------
impure function FavorBig (variable RV : inout RandomType ; Min, Max : integer ; Exclude : integer_vector) return integer is
------------------------------------------------------------
variable iRandomVal : integer ;
variable ExcludeList : SortListPType ;
variable count : integer ;
constant CkMax : integer := CheckMinMax("FavorBig", Min, Max) ;
begin
ExcludeList.add(Exclude, Min, CkMax) ;
count := ExcludeList.count ;
iRandomVal := FavorBig(RV, Min, CkMax - count) ;
-- adjust count, note iRandomVal changes while checking.
for i in 1 to count loop
exit when iRandomVal < ExcludeList.Get(i) ;
iRandomVal := iRandomVal + 1 ;
end loop ;
ExcludeList.erase ;
return iRandomVal ;
end function FavorBig ;
-----------------------------------------------------------------
--
-- Normal
-- Generate a random number with a normal distribution
--
-- Use Box Muller, per Wikipedia :
-- http ://en.wikipedia.org/wiki/Box%E2%80%93Muller_transform
--
------------------------------------------------------------
impure function Normal (variable RV : inout RandomType ; Mean, StdDeviation : real) return real is
------------------------------------------------------------
variable x01, y01 : real ;
variable StdNormalDist : real ; -- mean 0, variance 1
begin
-- add this check to set parameters?
if StdDeviation < 0.0 then
Alert(OSVVM_RANDOM_ALERTLOG_ID, "RandomPkg2019.Normal: Standard deviation must be >= 0.0", FAILURE) ;
return -1.0 ;
end if ;
-- Box Muller
-- Uniform (x01, RandomSeed) ;
-- Uniform (y01, RandomSeed) ;
x01 := Uniform(RV) ;
y01 := Uniform(RV) ;
StdNormalDist := sqrt(-2.0 * log(x01)) * cos(math_2_pi*y01) ;
-- Polar form rejected due to mean 50.0, std deviation = 5 resulted
-- in a median of 49
-- -- find two Uniform distributed values with range -1 to 1
-- -- that satisify S = X **2 + Y**2 < 1.0
-- loop
-- Uniform (x01, RandomSeed) ;
-- Uniform (y01, RandomSeed) ;
-- x := 2.0 * x01 - 1.0 ; -- scale to -1 to 1
-- y := 2.0 * y01 - 1.0 ;
-- s := x*x + y*y ;
-- exit when s < 1.0 and s > 0.0 ;
-- end loop ;
-- -- Calculate Standard Normal Distribution
-- StdNormalDist := x * sqrt((-2.0 * log(s)) / s) ;
-- Convert to have Mean and StdDeviation
return StdDeviation * StdNormalDist + Mean ;
end function Normal ;
------------------------------------------------------------
-- Normal + RandomVal >= Min and RandomVal <= Max
impure function Normal (variable RV : inout RandomType ; Mean, StdDeviation, Min, Max : real) return real is
------------------------------------------------------------
variable rRandomVal : real ;
begin
if Max < Min then
Alert(OSVVM_RANDOM_ALERTLOG_ID,
"RandomPkg2019.Normal: Min: " & to_string(Min, 2) &
" > Max: " & to_string(Max, 2),
FAILURE) ;
return Mean ;
else
loop
rRandomVal := Normal (RV, Mean, StdDeviation) ;
exit when rRandomVal >= Min and rRandomVal <= Max ;
end loop ;
end if ;
return rRandomVal ;
end function Normal ;
------------------------------------------------------------
-- Normal + RandomVal >= Min and RandomVal <= Max
impure function Normal (
------------------------------------------------------------
variable RV : inout RandomType ;
Mean : real ;
StdDeviation : real ;
Min : integer ;
Max : integer ;
Exclude : integer_vector := NULL_INTV
) return integer is
variable iRandomVal : integer ;
begin
if Max < Min then
Alert(OSVVM_RANDOM_ALERTLOG_ID,
"RandomPkg2019.Normal: Min: " & to_string(Min) &
" > Max: " & to_string(Max),
FAILURE) ;
return integer(round(Mean)) ;
else
loop
iRandomVal := integer(round( Normal(RV, Mean, StdDeviation) )) ;
exit when iRandomVal >= Min and iRandomVal <= Max and
not inside(iRandomVal, Exclude) ;
end loop ;
end if ;
return iRandomVal ;
end function Normal ;
-----------------------------------------------------------------
-- Poisson
-- Generate a random number with a poisson distribution
-- Discrete distribution = only generates integral values
--
-- Use knuth method, per Wikipedia :
-- http ://en.wikipedia.org/wiki/Poisson_distribution
--
------------------------------------------------------------
impure function Poisson (variable RV : inout RandomType ; Mean : real) return real is
------------------------------------------------------------
variable Product : Real := 1.0 ;
variable Bound : Real := 0.0 ;
variable UniformRand : Real := 0.0 ;
variable PoissonRand : Real := 0.0 ;
begin
Bound := exp(-1.0 * Mean) ;
Product := 1.0 ;
-- add this check to set parameters?
if Mean <= 0.0 or Bound <= 0.0 then
Alert(OSVVM_RANDOM_ALERTLOG_ID, "RandomPkg2019.Poisson: Mean < 0 or too large. Mean = " & real'image(Mean), FAILURE) ;
return Mean ;
end if ;
while (Product >= Bound) loop
PoissonRand := PoissonRand + 1.0 ;
UniformRand := Uniform(RV) ;
Product := Product * UniformRand ;
end loop ;
return PoissonRand ;
end function Poisson ; -- no range
------------------------------------------------------------
-- Poisson + RandomVal >= Min and RandomVal < Max
impure function Poisson (variable RV : inout RandomType ; Mean, Min, Max : real) return real is
------------------------------------------------------------
variable rRandomVal : real ;
begin
if Max < Min then
Alert(OSVVM_RANDOM_ALERTLOG_ID,
"RandomPkg2019.Poisson: Min: " & to_string(Min, 2) &
" > Max: " & to_string(Max, 2),
FAILURE) ;
return Mean ;
else
loop
rRandomVal := Poisson (RV, Mean) ;
exit when rRandomVal >= Min and rRandomVal <= Max ;
end loop ;
end if ;
return rRandomVal ;
end function Poisson ;
------------------------------------------------------------
impure function Poisson (
------------------------------------------------------------
variable RV : inout RandomType ;
Mean : real ;
Min : integer ;
Max : integer ;
Exclude : integer_vector := NULL_INTV
) return integer is
variable iRandomVal : integer ;
begin
if Max < Min then
Alert(OSVVM_RANDOM_ALERTLOG_ID,
"RandomPkg2019.Poisson: Min: " & to_string(Min) &
" > Max: " & to_string(Max),
FAILURE) ;
return integer(round(Mean)) ;
else
loop
iRandomVal := integer(round( Poisson (RV, Mean) )) ;
exit when iRandomVal >= Min and iRandomVal <= Max and
not inside(iRandomVal, Exclude) ;
end loop ;
end if ;
return iRandomVal ;
end function Poisson ;
--- ///////////////////////////////////////////////////////////////////////////
--
-- Randomization with range.
-- Uses internal settings of RandomParm to deterimine distribution.
--
--- ///////////////////////////////////////////////////////////////////////////
------------------------------------------------------------
impure function LocalRandInt (variable RV : inout RandomType ; Min, Max : integer) return integer is
------------------------------------------------------------
begin
--!! return LocalUniform(RV, Min, Max) ;
case RV.Param.Distribution is
when UNIFORM => return LocalUniform(RV, Min, Max) ;
when FAVOR_SMALL => return FavorSmall (RV, Min, Max) ;
when FAVOR_BIG => return FavorBig (RV, Min, Max) ;
when NORMAL => return Normal (RV, RV.Param.Mean, RV.Param.StdDeviation, Min, Max) ;
when POISSON => return Poisson(RV, RV.Param.Mean, Min, Max) ;
when others =>
Alert(OSVVM_RANDOM_ALERTLOG_ID, "RandomPkg2019.RandInt: RV.Param.Distribution not implemented", FAILURE) ;
return integer'low ;
end case ;
end function LocalRandInt ;
------------------------------------------------------------
impure function RandInt (variable RV : inout RandomType ; Min, Max : integer) return integer is
------------------------------------------------------------
constant CkMax : integer := CheckMinMax("RandInt", Min, Max) ;
begin
return LocalRandInt(RV, Min, CkMax) ;
end function RandInt ;
------------------------------------------------------------
impure function RandSlv (variable RV : inout RandomType ; Min, Max, Size : natural) return std_logic_vector is
------------------------------------------------------------
constant CkMax : integer := CheckMinMax("RandSlv", Min, Max) ;
begin
return std_logic_vector(to_unsigned(LocalRandInt(RV, Min, CkMax), Size)) ;
end function RandSlv ;
------------------------------------------------------------
impure function RandUnsigned (variable RV : inout RandomType ; Min, Max, Size : natural) return Unsigned is
------------------------------------------------------------
constant CkMax : integer := CheckMinMax("RandUnsigned", Min, Max) ;
begin
return to_unsigned(LocalRandInt(RV, Min, CkMax), Size) ;
end function RandUnsigned ;
------------------------------------------------------------
impure function RandSigned (variable RV : inout RandomType ; Min, Max : integer ; Size : natural ) return Signed is
------------------------------------------------------------
constant CkMax : integer := CheckMinMax("RandSigned", Min, Max) ;
begin
return to_signed(LocalRandInt(RV, Min, CkMax), Size) ;
end function RandSigned ;
------------------------------------------------------------
impure function RandIntV (variable RV : inout RandomType ; Min, Max : integer ; Size : natural) return integer_vector is
------------------------------------------------------------
variable result : integer_vector(1 to Size) ;
constant CkMax : integer := CheckMinMax("RandIntV", Min, Max) ;
begin
for i in result'range loop
result(i) := LocalRandInt(RV, Min, CkMax) ;
end loop ;
return result ;
end function RandIntV ;
------------------------------------------------------------
impure function RandIntV (variable RV : inout RandomType ; Min, Max : integer ; Unique : natural ; Size : natural) return integer_vector is
------------------------------------------------------------
variable result : integer_vector(1 to Size) ;