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Diffstat (limited to 'testsuite/vests/vhdl-93/ashenden/compliant/ch_05_pk_test.vhd')
-rw-r--r-- | testsuite/vests/vhdl-93/ashenden/compliant/ch_05_pk_test.vhd | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/testsuite/vests/vhdl-93/ashenden/compliant/ch_05_pk_test.vhd b/testsuite/vests/vhdl-93/ashenden/compliant/ch_05_pk_test.vhd new file mode 100644 index 000000000..0771d81d3 --- /dev/null +++ b/testsuite/vests/vhdl-93/ashenden/compliant/ch_05_pk_test.vhd @@ -0,0 +1,63 @@ + +-- 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_05_pk_test.vhd,v 1.2 2001-10-24 23:30:59 paw Exp $ +-- $Revision: 1.2 $ +-- +-- --------------------------------------------------------------------- + +package stimulus_generators is + + procedure all_possible_values ( signal bv : out bit_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; + +end package body stimulus_generators; |