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-- Common package for LXP32 testbenches
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-- Common package for LXP32 testbenches
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--
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--
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-- Part of the LXP32 verification environment
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-- Part of the LXP32 verification environment
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--
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--
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-- Copyright (c) 2016 by Alex I. Kuznetsov
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-- Copyright (c) 2016 by Alex I. Kuznetsov
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--
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-- Note: the "rand" function declared in this package implements
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-- a linear congruent pseudo-random number generator as defined in
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-- the ISO/IEC 9899:1999 standard.
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---------------------------------------------------------------------
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---------------------------------------------------------------------
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library ieee;
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library ieee;
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use ieee.std_logic_1164.all;
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use ieee.std_logic_1164.all;
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use ieee.numeric_std.all;
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use ieee.numeric_std.all;
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package common_pkg is
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package common_pkg is
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shared variable rand_state: unsigned(31 downto 0):=to_unsigned(1,32);
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type rng_state_type is record
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seed1: positive;
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seed2: positive;
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end record;
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impure function rand return integer;
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-- Generate a pseudo-random value of integer type from [a;b] range
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impure function rand(a: integer; b: integer) return integer;
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-- Output is stored in x
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procedure rand(variable st: inout rng_state_type; a,b: integer; variable x: out integer);
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-- Convert std_logic_vector to a hexadecimal string (similar to
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-- the "to_hstring" function from VHDL-2008
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function hex_string(x: std_logic_vector) return string;
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function hex_string(x: std_logic_vector) return string;
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end package;
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end package;
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