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-- ZPU
--
-- Copyright 2004-2008 oharboe - Řyvind 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;
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