CristalCaveGem » LustreC » Lustrec-Tests

-- 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_03_fg_03_01.vhd,v 1.2 2001-10-24 23:30:59 paw Exp $

-- $Revision: 1.2 $

--

-- ---------------------------------------------------------------------

entity thermostat is

  port ( desired_temp, actual_temp : in integer;

         heater_on : out boolean );

end entity thermostat;

architecture example of thermostat is

begin

  controller : process (desired_temp, actual_temp) is

  begin

    if actual_temp < desired_temp - 2 then

      heater_on <= true;

    elsif actual_temp > desired_temp + 2 then

      heater_on <= false;

    end if;

  end process controller;

end architecture example;