Subversion Repositories System09

--===========================================================================--
--                                                                           --
--         Synthesizable PS/2 Keyboard Key map ROM for the Spartan 2         --
--                                                                           --
--===========================================================================--
--
--  File name      : keymap_rom512_b4.vhd
--
--  Entity name    : keymap_rom 
--
--  Purpose        : PS/2 key code look up table for PS/2 Keyboard
--                   Converts 7 bit key code to ASCII
--                   Address bit 8      = Shift
--                   Address bit 7      = CAPS Lock
--                   Address bits 6 - 0 = Key code
--                   Data bits 6 - 0    = ASCII code
--                   Designed for the Spartan 2
--
--  Dependencies   : ieee.std_logic_1164
--                   ieee.std_logic_arith
--                   ieee.std_logic_unsigned
--
--  Uses           : RAMB4_S8
--
--  Author         : John E. Kent
--
--  Email          : dilbert57@opencores.org      
--
--  Web            : http://opencores.org/project,system09
--
--  Copyright (C) 2004 - 2010 John Kent
--
--  This program 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 3 of the License, 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 more details.
--
--  You should have received a copy of the GNU General Public License
--  along with this program.  If not, see <http://www.gnu.org/licenses/>.
--
--===========================================================================--
--                                                                           --
--                              Revision  History                            --
--                                                                           --
--===========================================================================--
--
-- Version Date        Author     Changes
-- 0.1     2004-10-18  John Kent  Initial Version
-- 0.2     2010-06-17  John Kent  Added header, Rename data signals
--
--
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
library unisim;
	use unisim.vcomponents.all;
 
 
entity keymap_rom is
    Port (
       clk      : in  std_logic;
       rst      : in  std_logic;
       cs       : in  std_logic;
       rw       : in  std_logic;
       addr     : in  std_logic_vector (8 downto 0);
       data_in  : in  std_logic_vector (7 downto 0);
       data_out : out std_logic_vector (7 downto 0)
    );
end keymap_rom;
 
architecture rtl of keymap_rom is
   type data_array is array(0 to 0) of std_logic_vector(7 downto 0);
   signal xdata : data_array;
   signal en : std_logic_vector(0 downto 0);
   signal dp : std_logic_vector(0 downto 0);
   signal we : std_logic;
	signal xaddr : std_logic_vector(10 downto 0);
begin
 
  ROM : RAMB16_S9
    generic map (
    INIT_00 => x"00327761737a0000003171000000000000600900000000000000000000000000",
    INIT_01 => x"003837756a6d00000036796768626e0000357274667620000033346564786300",
    INIT_02 => x"00005c005d0d000000003d5b00270000002d703b6c2f2e000039306f696b2c00",
    INIT_03 => x"0000000000000000001b000000007f0000000000000000000008000000000000",
    INIT_04 => x"00325741535a00000031510000000000007e0900000000000000000000000000",
    INIT_05 => x"003837554a4d00000036594748424e0000355254465620000033344544584300",
    INIT_06 => x"00005c005d0d000000003d5b00270000002d503b4c2f2e000039304f494b2c00",
    INIT_07 => x"0000000000000000001b000000007f0000000000000000000008000000000000",
    INIT_08 => x"00405741535a00000021510000000000007e0900000000000000000000000000",
    INIT_09 => x"002a26554a4d0000005e594748424e0000255254465620000023244544584300",
    INIT_0A => x"00007c007d0d000000002b7b00220000005f503a4c3f3e000028294f494b3c00",
    INIT_0B => x"0000000000000000001b000000007f0000000000000000000008000000000000",
    INIT_0C => x"00407761737a0000002171000000000000600900000000000000000000000000",
    INIT_0D => x"002a26756a6d0000005e796768626e0000257274667620000023246564786300",
    INIT_0E => x"00007c007d0d000000002b7b00220000005f703a6c3f3e000028296f696b3c00",
    INIT_0F => x"0000000000000000001b000000007f0000000000000000000008000000000000"
    )
 
      port map (
         CLK     => clk,
         SSR     => rst,
         EN      => en(0),
         WE      => we,
         ADDR    => xaddr,
         DI      => data_in,
         DIP(0)  => dp(0),
         DO      => xdata(0),
         DOP(0)  => dp(0)
      );
   rom_glue: process (cs, rw, addr, xdata)
   begin
      en(0)  <= cs;
      data_out  <= xdata(0);
      we <= not rw;
		xaddr(8 downto 0) <= addr;
		xaddr(10 downto 9) <= (others => '0');
   end process;
 
end architecture rtl;