1 files changed, 56 insertions, 0 deletions
diff --git a/testsuite/vests/vhdl-ams/ashenden/compliant/packages/address_decoder.vhd b/testsuite/vests/vhdl-ams/ashenden/compliant/packages/address_decoder.vhd
new file mode 100644
index 000000000..14c20b022
--- /dev/null
+++ b/testsuite/vests/vhdl-ams/ashenden/compliant/packages/address_decoder.vhd
@@ -0,0 +1,56 @@
+
+-- 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 address_decoder is
+  port ( addr : in work.cpu_types.address;
+         status : in work.cpu_types.status_value;
+         mem_sel, int_sel, io_sel : out bit );
+end entity address_decoder;
+
+--------------------------------------------------
+
+architecture functional of address_decoder is
+
+  constant mem_low : work.cpu_types.address := X"000000";
+  constant mem_high : work.cpu_types.address := X"EFFFFF";
+  constant io_low : work.cpu_types.address := X"F00000";
+  constant io_high : work.cpu_types.address := X"FFFFFF";
+
+begin
+
+  mem_decoder :
+    mem_sel <= '1' when ( work.cpu_types."="(status, work.cpu_types.fetch)
+                          or work.cpu_types."="(status, work.cpu_types.mem_read)
+                          or work.cpu_types."="(status, work.cpu_types.mem_write) )
+                        and addr >= mem_low
+                        and addr <= mem_high else
+               '0';
+
+  int_decoder :
+    int_sel <= '1' when work.cpu_types."="(status, work.cpu_types.int_ack) else
+               '0';
+
+  io_decoder :
+    io_sel <= '1' when ( work.cpu_types."="(status, work.cpu_types.io_read)
+                         or work.cpu_types."="(status, work.cpu_types.io_write) )
+                       and addr >= io_low
+                       and addr <= io_high else
+              '0';
+
+end architecture functional;