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diff --git a/testsuite/vests/vhdl-ams/ashenden/compliant/digital-modeling/zmux.vhd b/testsuite/vests/vhdl-ams/ashenden/compliant/digital-modeling/zmux.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 
+
+entity zmux is
+end entity zmux;
+
+
+library util;  use util.stimulus_generators.all;
+
+architecture test of zmux is
+
+  signal sel0, sel1, d0, d1, d2, d3 : bit := '0';
+  signal functional_z, equivalent_z : bit;
+
+begin
+
+  functional_mux : block is
+    port ( z : out bit );
+    port map ( z => functional_z );
+  begin
+
+    -- code from book
+
+    zmux : z <= d0 when sel1 = '0' and sel0 = '0' else
+                d1 when sel1 = '0' and sel0 = '1' else
+                d2 when sel1 = '1' and sel0 = '0' else
+                d3 when sel1 = '1' and sel0 = '1';
+
+    -- end code from book
+
+  end block functional_mux;
+
+  --------------------------------------------------
+
+  equivalent_mux : block is
+    port ( z : out bit );
+    port map ( z => equivalent_z );
+  begin
+
+    -- code from book
+
+    zmux : process is
+    begin
+      if sel1 = '0' and sel0 = '0' then
+        z <= d0;
+      elsif sel1 = '0' and sel0 = '1' then
+        z <= d1;
+      elsif sel1 = '1' and sel0 = '0' then
+        z <= d2;
+      elsif sel1 = '1' and sel0 = '1' then
+        z <= d3;
+      end if;
+      wait on d0, d1, d2, d3, sel0, sel1;
+    end process zmux;
+
+    -- end code from book
+
+  end block equivalent_mux;
+
+  --------------------------------------------------
+
+  stimulus :
+    all_possible_values( bv(0) => sel0, bv(1) => sel1,
+			 bv(2) => d0, bv(3) => d1,
+			 bv(4) => d2, bv(5) => d3,
+			 delay_between_values => 10 ns );
+
+  verifier :
+  assert functional_z = equivalent_z
+    report "Functional and equivalent models give different results";
+
+end architecture test;