1
2-- Copyright (C) 1996 Morgan Kaufmann Publishers, Inc
3
4-- This file is part of VESTs (Vhdl tESTs).
5
6-- VESTs is free software; you can redistribute it and/or modify it
7-- under the terms of the GNU General Public License as published by the
8-- Free Software Foundation; either version 2 of the License, or (at
9-- your option) any later version.
10
11-- VESTs is distributed in the hope that it will be useful, but WITHOUT
12-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13-- FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14-- for more details.
15
16-- You should have received a copy of the GNU General Public License
17-- along with VESTs; if not, write to the Free Software Foundation,
18-- Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19
20-- ---------------------------------------------------------------------
21--
22-- $Id: ch_09_ch_09_04.vhd,v 1.2 2001-10-24 23:31:00 paw Exp $
23-- $Revision: 1.2 $
24--
25-- ---------------------------------------------------------------------
26
27package arithmetic_ops is
28
29  -- code from book
30
31  procedure increment ( bv : inout bit_vector;  by : in integer := 1 );
32
33  procedure increment ( int : inout integer;  by : in integer := 1 );
34
35  -- end code from book
36
37end package arithmetic_ops;
38
39package body arithmetic_ops is
40
41  procedure increment ( bv : inout bit_vector;  by : in integer := 1 ) is
42  begin
43  end procedure increment;
44
45  procedure increment ( int : inout integer;  by : in integer := 1 ) is
46  begin
47  end procedure increment;
48
49end package body arithmetic_ops;
50
51
52entity ch_09_04 is
53
54end entity ch_09_04;
55
56library stimulus;
57use stimulus.stimulus_generators.all;
58
59architecture test of ch_09_04 is
60
61  -- code from book
62
63  -- MTI bug mt017
64  -- alias bv_increment is work.arithmetic_ops.increment [ bit_vector, integer ];
65
66  alias int_increment is work.arithmetic_ops.increment [ integer, integer ];
67
68  -- workaround to avoid MTI bug mt018
69  -- alias "*" is "and" [ bit, bit return bit ];
70
71  alias "*" is std.standard."and" [ bit, bit return bit ];
72
73  -- alias "+" is "or" [ bit, bit return bit ];
74
75  alias "+" is std.standard."or" [ bit, bit return bit ];
76
77  -- alias "-" is "not" [ bit return bit ];
78
79  alias "-" is std.standard."not" [ bit return bit ];
80
81  -- end workaround
82
83  alias high is std.standard.'1' [ return bit ];
84
85  -- end code from book
86
87  signal a, b, c, s : bit := '0';
88  signal test_vector : bit_vector(1 to 3);
89  signal test_high : bit := high;
90
91begin
92
93  -- code from book
94
95  -- workaround to avoid MTI bug mt018
96  -- s <= a * b + (-a) * c;
97
98  s <= (a and b) or ((not a) and c);
99
100  -- end workaround
101
102  -- end code from book
103
104  stimulus : all_possible_values ( bv => test_vector,
105				   delay_between_values => 10 ns );
106
107  (a, b, c) <= test_vector;
108
109end architecture test;
110