Project

General

Profile

Download (1.44 KB) Statistics
| Branch: | Tag: | Revision:
1 d93979b7 Arnaud Dieumegard
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_03_fg_03_01.vhd,v 1.2 2001-10-24 23:30:59 paw Exp $
23
-- $Revision: 1.2 $
24
--
25
-- ---------------------------------------------------------------------
26
27
entity thermostat is
28
  port ( desired_temp, actual_temp : in integer;
29
         heater_on : out boolean );
30
end entity thermostat;
31
32
architecture example of thermostat is
33
begin
34
35
  controller : process (desired_temp, actual_temp) is
36
  begin
37
    if actual_temp < desired_temp - 2 then
38
      heater_on <= true;
39
    elsif actual_temp > desired_temp + 2 then
40
      heater_on <= false;
41
    end if;
42
  end process controller;
43
44
end architecture example;