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-- $Id: sys_conf.vhd 509 2013-04-21 20:46:20Z mueller $
--
-- Copyright 2010-2013 by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
--
-- This program is free software; you may redistribute and/or modify it under
-- the terms of the GNU General Public License as published by the Free
-- Software Foundation, either version 2, or at your option any later version.
--
-- This program 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 complete details.
--
------------------------------------------------------------------------------
-- Package Name:   sys_conf
-- Description:    Definitions for sys_w11a_n2 (for synthesis)
--
-- Dependencies:   -
-- Tool versions:  xst 11.4, 13.1; ghdl 0.26-0.29
-- Revision History: 
-- Date         Rev Version  Comment
-- 2013-04-21   509   1.2    add fx2 settings
-- 2011-11-19   428   1.1.1  use clksys=56 (58 no closure after numeric_std...)
-- 2010-11-27   341   1.1    add dcm and memctl related constants (clksys=58)
-- 2010-05-05   295   1.0    Initial version (derived from _s3 version)
------------------------------------------------------------------------------
 
library ieee;
use ieee.std_logic_1164.all;
 
use work.slvtypes.all;
 
-- valid system clock / delay combinations:
--  div mul  clksys  read0 read1 write
--    1   1   50.0     2     2     3
--   25  27   54.0     3     3     3
--   25  29   58.0     3     3     4
 
package sys_conf is
 
  constant sys_conf_clkfx_divide : positive   :=  25;
  constant sys_conf_clkfx_multiply : positive :=  28;   -- ==> 56 MHz
 
  constant sys_conf_memctl_read0delay : positive := 3;
  constant sys_conf_memctl_read1delay : positive := sys_conf_memctl_read0delay;
  constant sys_conf_memctl_writedelay : positive := 4;
 
  constant sys_conf_ser2rri_defbaud : integer := 115200;   -- default 115k baud
 
  -- fx2 settings: petowidth=10 -> 2^10 30 MHz clocks -> ~33 usec
  constant sys_conf_fx2_petowidth  : positive := 10;
  constant sys_conf_fx2_ccwidth  : positive := 5;
 
  constant sys_conf_hio_debounce : boolean := true;    -- instantiate debouncers
 
  constant sys_conf_bram           : integer :=  0;      -- no bram, use cache
  constant sys_conf_bram_awidth    : integer := 14;      -- bram size (16 kB)
  constant sys_conf_mem_losize     : integer := 8#167777#; --   4 MByte
--constant sys_conf_mem_losize     : integer := 8#003777#; -- 128 kByte (debug)
 
--  constant sys_conf_bram           : integer :=  1;      --  bram only 
--  constant sys_conf_bram_awidth    : integer := 15;      -- bram size (32 kB)
--  constant sys_conf_mem_losize     : integer := 8#000777#; -- 32 kByte
 
  constant sys_conf_cache_fmiss    : slbit   := '0';     -- cache enabled
 
  -- derived constants
 
  constant sys_conf_clksys : integer :=
    (50000000/sys_conf_clkfx_divide)*sys_conf_clkfx_multiply;
  constant sys_conf_clksys_mhz : integer := sys_conf_clksys/1000000;
 
  constant sys_conf_ser2rri_cdinit : integer :=
    (sys_conf_clksys/sys_conf_ser2rri_defbaud)-1;
 
end package sys_conf;
 
-- Note: mem_losize holds 16 MSB of the PA of the addressable memory
--        2 211 111 111 110 000 000 000
--        1 098 765 432 109 876 543 210
--
--        0 000 000 011 111 111 000 000  -> 00037777  --> 14bit -->  16 kByte
--        0 000 000 111 111 111 000 000  -> 00077777  --> 15bit -->  32 kByte
--        0 000 001 111 111 111 000 000  -> 00177777  --> 16bit -->  64 kByte
--        0 000 011 111 111 111 000 000  -> 00377777  --> 17bit --> 128 kByte
--        0 011 111 111 111 111 000 000  -> 03777777  --> 20bit -->   1 MByte
--        1 110 111 111 111 111 000 000  -> 16777777  --> 22bit -->   4 MByte
--                                          upper 256 kB excluded for 11/70 UB