Import vests testsuite

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diff --git a/testsuite/vests/vhdl-ams/ashenden/compliant/analog-modeling/dac_12_bit.vhd b/testsuite/vests/vhdl-ams/ashenden/compliant/analog-modeling/dac_12_bit.vhd
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+++ b/testsuite/vests/vhdl-ams/ashenden/compliant/analog-modeling/dac_12_bit.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 
+
+library ieee;  use ieee.std_logic_1164.all;
+library ieee_proposed;  use ieee_proposed.electrical_systems.all;
+                        
+entity dac_12_bit is
+  port ( signal  bus_in : in std_ulogic_vector (11 downto 0); 
+         terminal analog_out :  electrical );
+end entity dac_12_bit;
+
+----------------------------------------------------------------
+
+architecture behavioral of dac_12_bit is
+  
+  constant v_max : real := 3.3;
+  signal s_out : real := 0.0;
+  quantity v_out across i_out through analog_out to electrical_ref;
+        
+begin
+  
+  convert : process ( bus_in ) is
+    variable sum : natural;
+  begin
+    sum  := 0;
+    for i in bus_in'range loop
+      sum := sum * 2 + boolean'pos( bus_in(i) = '1' or bus_in(i) = 'H' );
+    end loop;
+    s_out <= v_max * real(sum) / real(2**12 - 1);
+  end process convert;
+                                     
+  v_out == s_out'ramp(1.0E-6);
+                                     
+end architecture behavioral;