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-- keymap_rom_slice.vhd
--
-- PS2 Keycode look up table
-- converts 7 bit key code to ASCII
-- Address bit 7 = CAPS Lock
-- Address bit 8 = Shift
--
-- J.E.Kent
-- 18th Oct 2004
-- 28th Jan 2007 - made entity compatible with block RAM versions.
--	3rd Feb 2007 - initialized with Bit_vector
--
library IEEE;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.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);
       rdata : out std_logic_vector (7 downto 0);
       wdata : in  std_logic_vector (7 downto 0)
    );
end keymap_rom;
 
architecture rtl of keymap_rom is
  constant width   : integer := 8;
  constant memsize : integer := 512;
  signal rvect : std_logic_vector(255 downto 0);
 
  type rom_array is array(0 to 15) of std_logic_vector (255 downto 0);
 
  constant rom_data : rom_array :=
  ( 
    x"00327761737a0000003171000000000000600900000000000000000000000000",	-- 1F - 00
    x"003837756a6d00000036796768626e0000357274667620000033346564786300",	-- 3F - 20
    x"00005c005d0d000000003d5b00270000002d703b6c2f2e000039306f696b2c00",	-- 5F - 40
    x"0000000000000000001b000000007f0000000000000000000008000000000000",	-- 7F - 60
 
    x"00325741535a00000031510000000000007e0900000000000000000000000000",	-- 9F - 80
    x"003837554a4d00000036594748424e0000355254465620000033344544584300",	-- BF - A0
    x"00005c005d0d000000003d5b00270000002d503b4c2f2e000039304f494b2c00",	-- DF - C0
    x"0000000000000000001b000000007f0000000000000000000008000000000000",	-- FF - E0
 
    x"00405741535a00000021510000000000007e0900000000000000000000000000",	-- 1F - 00
    x"002a26554a4d0000005e594748424e0000255254465620000023244544584300",	-- 3F - 20
    x"00007c007d0d000000002b7b00220000005f503a4c3f3e000028294f494b3c00",	-- 5F - 40
    x"0000000000000000001b000000007f0000000000000000000008000000000000",	-- 7F - 60
 
    x"00407761737a0000002171000000000000600900000000000000000000000000",	-- 9F - 80
    x"002a26756a6d0000005e796768626e0000257274667620000023246564786300",	-- BF - A0
    x"00007c007d0d000000002b7b00220000005f703a6c3f3e000028296f696b3c00",	-- DF - C0
    x"0000000000000000001b000000007f0000000000000000000008000000000000"	   -- FF - E0
  );
begin
 
   rvect <= rom_data(conv_integer(addr(8 downto 5))); 
	rdata <= rvect( conv_integer(addr(4 downto 0))*8+7 downto conv_integer(addr(4 downto 0))*8);
end architecture rtl;