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+
+-- Copyright (C) 2002 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
+
+entity counter is
+ port ( clk, reset : in bit; count : out natural );
+end entity counter;
+
+--------------------------------------------------
+
+architecture behavior of counter is
+begin
+
+ incrementer : process is
+ variable count_value : natural := 0;
+ begin
+ count <= count_value;
+ loop
+ loop
+ wait until clk = '1' or reset = '1';
+ exit when reset = '1';
+ count_value := (count_value + 1) mod 16;
+ count <= count_value;
+ end loop;
+ -- at this point, reset = '1'
+ count_value := 0;
+ count <= count_value;
+ wait until reset = '0';
+ end loop;
+ end process incrementer;
+
+end architecture behavior;