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-- Copyright (C) 1996 Morgan Kaufmann Publishers, Inc
-- This file is part of VESTs (Vhdl tESTs).
-- VESTs is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the
-- Free Software Foundation; either version 2 of the License, or (at
-- your option) any later version.
-- VESTs 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 General Public License
-- for more details.
-- You should have received a copy of the GNU General Public License
-- along with VESTs; if not, write to the Free Software Foundation,
-- Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-- ---------------------------------------------------------------------
--
-- $Id: ch_19_random.vhd,v 1.2 2001-10-26 16:29:36 paw Exp $
-- $Revision: 1.2 $
--
-- ---------------------------------------------------------------------
package random is
type distribution_type is (fixed, uniform, exponential);
subtype probability is real range 0.0 to 1.0;
type probability_vector is array (positive range <>) of probability;
type seed_type is record
seed1, seed2 : positive;
end record seed_type;
type seed_array is array ( natural range <> ) of seed_type;
constant sample_seeds : seed_array(0 to 50);
type random_info_record is record
seed : seed_type;
distribution : distribution_type;
mean : real;
lower_bound, upper_bound : real;
end record random_info_record;
procedure init_fixed ( random_info : out random_info_record;
mean : in real );
procedure init_uniform ( random_info : out random_info_record;
lower_bound, upper_bound : in real;
seed : in seed_type );
procedure init_exponential ( random_info : out random_info_record;
mean : in real;
seed : in seed_type );
procedure generate_random ( random_info : inout random_info_record;
random_number : out real );
end package random;
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