1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
-- 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_12_ch_12_01.vhd,v 1.2 2001-10-24 23:31:00 paw Exp $
-- $Revision: 1.2 $
--
-- ---------------------------------------------------------------------
-- code from book
entity and2 is
generic ( Tpd : time );
port ( a, b : in bit; y : out bit );
end entity and2;
architecture simple of and2 is
begin
and2_function :
y <= a and b after Tpd;
end architecture simple;
-- end code from book
entity ch_12_01 is
end entity ch_12_01;
library stimulus;
use stimulus.stimulus_generators.all;
architecture test of ch_12_01 is
signal a1, b1, sig1, sig2, sig_out : bit;
signal test_vector : bit_vector(1 to 3);
begin
-- code from book
gate1 : entity work.and2(simple)
generic map ( Tpd => 2 ns )
port map ( a => sig1, b => sig2, y => sig_out );
gate2 : entity work.and2(simple)
generic map ( Tpd => 3 ns )
port map ( a => a1, b => b1, y => sig1 );
-- end code from book
stimulus : all_possible_values ( bv => test_vector,
delay_between_values => 10 ns );
(sig2, a1, b1) <= test_vector;
end architecture test;
|
