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diff --git a/testsuite/vests/vhdl-ams/ashenden/compliant/util/clock_duty.vhd b/testsuite/vests/vhdl-ams/ashenden/compliant/util/clock_duty.vhd
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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 
+
+-- This digital clock allows user to specify the duty cycle using
+-- the parameters "on_time" and "off_time"
+
+library ieee;  use ieee.std_logic_1164.all;
+
+entity clock_duty is
+
+  generic ( on_time : time := 20 us;
+            off_time : time := 19.98 ms ); 
+  
+  port ( clock_out    : out std_logic := 'Z' );
+  
+end entity clock_duty;
+
+
+architecture ideal of clock_duty is
+
+begin
+
+  process
+  begin
+    wait for 1 us;
+    clock_out <= '1';
+    wait for on_time;
+    clock_out <= '0';
+    wait for off_time;
+  end process;
+
+end architecture ideal;