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-- Copyright (C) 1996 Morgan Kaufmann Publishers, Inc
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-- This file is part of VESTs (Vhdl tESTs).
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-- VESTs is free software; you can redistribute it and/or modify it
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-- under the terms of the GNU General Public License as published by the
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-- Free Software Foundation; either version 2 of the License, or (at
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-- your option) any later version. 
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-- VESTs is distributed in the hope that it will be useful, but WITHOUT
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-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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-- FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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-- for more details. 
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-- You should have received a copy of the GNU General Public License
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-- along with VESTs; if not, write to the Free Software Foundation,
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-- Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
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-- ---------------------------------------------------------------------
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--
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-- $Id: ch_13_fg_13_09.vhd,v 1.1.1.1 2001-08-22 18:20:48 paw Exp $
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-- $Revision: 1.1.1.1 $
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--
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-- ---------------------------------------------------------------------
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-- not in book
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entity alarm_clock is
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end entity alarm_clock;
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-- end not in book
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architecture top_level of alarm_clock is
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  --use work.counter_types.digit;
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  use work.counter_types.all;
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  signal reset_to_midnight, seconds_clk : bit;
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  signal seconds_units, seconds_tens : digit;
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  -- . . .
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begin
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  seconds : configuration work.counter_down_to_gate_level
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    port map ( clk => seconds_clk, clr => reset_to_midnight,
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               q0 => seconds_units, q1 => seconds_tens );
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  -- . . .
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  -- not in book
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  clk_gen : seconds_clk <= not seconds_clk after 20 ns;
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  clr_gen : reset_to_midnight <= '1' after 95 ns,
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		                 '0' after 135 ns;
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  -- end not in book;
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end architecture top_level;
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