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+-- ZPU
+--
+-- Copyright 2004-2008 oharboe - Øyvind Harboe - oyvind.harboe@zylin.com
+-- 
+-- The FreeBSD license
+-- 
+-- Redistribution and use in source and binary forms, with or without
+-- modification, are permitted provided that the following conditions
+-- are met:
+-- 
+-- 1. Redistributions of source code must retain the above copyright
+--    notice, this list of conditions and the following disclaimer.
+-- 2. Redistributions in binary form must reproduce the above
+--    copyright notice, this list of conditions and the following
+--    disclaimer in the documentation and/or other materials
+--    provided with the distribution.
+-- 
+-- THIS SOFTWARE IS PROVIDED BY THE ZPU PROJECT ``AS IS'' AND ANY
+-- EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+-- PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+-- ZPU PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+-- INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+-- (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+-- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+-- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+-- STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+-- ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+-- 
+-- The views and conclusions contained in the software and documentation
+-- are those of the authors and should not be interpreted as representing
+-- official policies, either expressed or implied, of the ZPU Project.
+
+
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+package zpu_config is
+
+  -- generate trace output or not.
+  constant Generate_Trace  : boolean                      := false;
+  constant wordPower       : integer                      := 5;
+  -- during simulation, set this to '0' to get matching trace.txt 
+  constant DontCareValue   : std_logic                    := 'X';
+  -- Clock frequency in MHz.
+  constant ZPU_Frequency   : std_logic_vector(7 downto 0) := x"64";
+  -- This is the msb address bit. bytes=2^(maxAddrBitIncIO+1)
+  constant maxAddrBitIncIO : integer                      := 15;
+  constant maxAddrBitBRAM  : integer                      := 14;
+
+  -- start byte address of stack. 
+  -- point to top of RAM - 2*words
+  constant spStart : std_logic_vector(maxAddrBitIncIO downto 0) :=
+    std_logic_vector(to_unsigned((2**(maxAddrBitBRAM+1))-8, maxAddrBitIncIO+1));
+
+end zpu_config;