1 files changed, 137 insertions, 0 deletions
diff --git a/testsuite/vests/vhdl-ams/ashenden/compliant/digital-modeling/counter.vhd b/testsuite/vests/vhdl-ams/ashenden/compliant/digital-modeling/counter.vhd
new file mode 100644
index 000000000..faf5f1414
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+++ b/testsuite/vests/vhdl-ams/ashenden/compliant/digital-modeling/counter.vhd
@@ -0,0 +1,137 @@
+
+-- 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 
+
+-- not in book
+
+package counter_types is
+
+  -- code in book (in text)
+
+  subtype digit is bit_vector(3 downto 0);
+
+  -- end code in book (in text)
+
+end package counter_types;
+
+
+entity add_1 is
+  port ( d0, d1, d2, d3 : in bit;
+         y0, y1, y2, y3 : out  bit );
+end entity add_1;
+
+
+architecture boolean_eqn of add_1 is
+begin
+
+  y0 <= not d0 after 4 ns;
+
+  y1 <= (not d1 and d0)
+        or (d1 and not d0) after 4 ns;
+
+  y2 <= (not d2 and d1 and d0)
+	or (d2 and not (d1 and d0)) after 4 ns;
+
+  y3 <= (not d3 and d2 and d1 and d0)
+	or (d3 and not (d2 and d1 and d0)) after 4 ns;
+
+end architecture boolean_eqn;
+
+
+entity buf4 is
+  port ( a0, a1, a2, a3 : in bit;
+         y0, y1, y2, y3 : out  bit );
+end entity buf4;
+
+
+architecture basic of buf4 is
+begin
+
+  y0 <= a0 after 2 ns;
+  y1 <= a1 after 2 ns;
+  y2 <= a2 after 2 ns;
+  y3 <= a3 after 2 ns;
+
+end architecture basic;
+  
+
+use work.counter_types.all;
+
+-- end not in book
+
+
+entity counter is
+  port ( clk, clr : in bit;
+         q0, q1 : out digit );
+end entity counter;
+
+--------------------------------------------------
+
+architecture registered of counter is
+
+  signal current_val0, current_val1, next_val0, next_val1 : digit;
+
+begin
+
+  val0_reg : entity work.reg4(struct)
+    port map ( d0 => next_val0(0), d1 => next_val0(1),
+               d2 => next_val0(2), d3 => next_val0(3),
+               q0 => current_val0(0), q1 => current_val0(1),
+               q2 => current_val0(2), q3 => current_val0(3),
+               clk => clk, clr => clr );
+
+  val1_reg : entity work.reg4(struct)
+    port map ( d0 => next_val1(0), d1 => next_val1(1),
+               d2 => next_val1(2), d3 => next_val1(3),
+               q0 => current_val1(0), q1 => current_val1(1),
+               q2 => current_val1(2), q3 => current_val1(3),
+               clk => clk, clr => clr );
+
+  incr0 : entity work.add_1(boolean_eqn) -- . . .;
+    -- not in book
+    port map ( d0 => current_val0(0), d1 => current_val0(1),
+               d2 => current_val0(2), d3 => current_val0(3),
+	       y0 => next_val0(0), y1 => next_val0(1),
+               y2 => next_val0(2), y3 => next_val0(3) );
+    -- end not in book
+
+  incr1 : entity work.add_1(boolean_eqn) -- . . .;
+    -- not in book
+    port map ( d0 => current_val1(0), d1 => current_val1(1),
+               d2 => current_val1(2), d3 => current_val1(3),
+	       y0 => next_val1(0), y1 => next_val1(1),
+               y2 => next_val1(2), y3 => next_val1(3) );
+    -- end not in book
+
+  buf0 : entity work.buf4(basic) -- . . .;
+    -- not in book
+    port map ( a0 => current_val0(0), a1 => current_val0(1),
+               a2 => current_val0(2), a3 => current_val0(3),
+	       y0 => q0(0), y1 => q0(1),
+               y2 => q0(2), y3 => q0(3) );
+    -- end not in book
+
+  buf1 : entity work.buf4(basic) -- . . .;
+    -- not in book
+    port map ( a0 => current_val1(0), a1 => current_val1(1),
+               a2 => current_val1(2), a3 => current_val1(3),
+	       y0 => q1(0), y1 => q1(1),
+               y2 => q1(2), y3 => q1(3) );
+    -- end not in book
+
+end architecture registered;