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
76
77
78
79
80
81
82
83
84
85
86
|
-- 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_ch_05_21.vhd,v 1.3 2001-10-26 16:29:34 paw Exp $
-- $Revision: 1.3 $
--
-- ---------------------------------------------------------------------
-- code from book:
entity and_gate is
port ( i : in bit_vector; y : out bit );
end entity and_gate;
-- end of code from book
architecture behavioral of and_gate is
begin
reducer : process (i) is
constant Tpd : delay_length := 2 ns;
variable result : bit;
begin
result := '1';
for index in i'range loop
result := result and i(index);
end loop;
y <= result after Tpd;
end process reducer;
end architecture behavioral;
entity ch_05_21 is
end entity ch_05_21;
library stimulus;
architecture test of ch_05_21 is
-- code from book:
signal serial_select, write_en, bus_clk, serial_wr : bit;
-- end of code from book
use stimulus.stimulus_generators.all;
signal test_input : bit_vector(2 downto 0);
begin
-- code from book:
serial_write_gate : entity work.and_gate
port map ( i(1) => serial_select,
i(2) => write_en,
i(3) => bus_clk,
y => serial_wr );
-- end of code from book
stimulus_proc : all_possible_values( bv => test_input,
delay_between_values => 10 ns );
(serial_select, write_en, bus_clk) <= test_input;
end architecture test;
|
