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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: util_pk_test.vhd,v 1.2 2001-10-24 23:31:00 paw Exp $
-- $Revision: 1.2 $
--
-- ---------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
package stimulus_generators is
procedure all_possible_values ( signal bv : out bit_vector;
delay_between_values : in delay_length );
procedure all_possible_values ( signal bv : out std_ulogic_vector;
delay_between_values : in delay_length );
procedure all_possible_values ( signal bv : out std_logic_vector;
delay_between_values : in delay_length );
end package stimulus_generators;
package body stimulus_generators is
type digit_table is array ( natural range 0 to 1 ) of bit;
constant digit : digit_table := ( '0', '1' );
function natural_to_bv ( nat : in natural;
length : in natural ) return bit_vector is
variable temp : natural := nat;
variable result : bit_vector(0 to length - 1);
begin
for index in result'reverse_range loop
result(index) := digit( temp rem 2 );
temp := temp / 2;
end loop;
return result;
end function natural_to_bv;
procedure all_possible_values ( signal bv : out bit_vector;
delay_between_values : in delay_length ) is
begin
bv <= natural_to_bv(0, bv'length);
for value in 1 to 2**bv'length - 1 loop
wait for delay_between_values;
bv <= natural_to_bv(value, bv'length);
end loop;
end procedure all_possible_values;
procedure all_possible_values ( signal bv : out std_ulogic_vector;
delay_between_values : in delay_length ) is
begin
bv <= To_StdULogicVector(natural_to_bv(0, bv'length));
for value in 1 to 2**bv'length - 1 loop
wait for delay_between_values;
bv <= To_StdULogicVector(natural_to_bv(value, bv'length));
end loop;
end procedure all_possible_values;
procedure all_possible_values ( signal bv : out std_logic_vector;
delay_between_values : in delay_length ) is
begin
bv <= To_StdLogicVector(natural_to_bv(0, bv'length));
for value in 1 to 2**bv'length - 1 loop
wait for delay_between_values;
bv <= To_StdLogicVector(natural_to_bv(value, bv'length));
end loop;
end procedure all_possible_values;
end package body stimulus_generators;
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