--===========================================================================--
-- --
-- Synthesizable PS/2 Keyboard Key map ROM --
-- --
--===========================================================================--
--
-- File name : keymap_rom_slice.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
-- Using constant array look up.
--
-- Dependencies : ieee.std_logic_1164
-- ieee.std_logic_arith
-- ieee.std_logic_unsigned
--
-- Uses : None
--
-- 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 .
--
--===========================================================================--
-- --
-- Revision History --
-- --
--===========================================================================--
--
-- Version Date Author Changes
--
-- 0.1 2004-10-18 John Kent Initial version
--
-- 0.2 2007-01-28 John Kent Made entity compatible with block RAM versions
--
-- 0.3 2007-02-03 John Kent Initialized with bit_vector
--
-- 0.4 2010-06-17 John Kent Updated header and added GPL
-- Renamed data_in and data_out signals
--
--
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);
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 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
);
signal rom_out : std_logic_vector(255 downto 0);
begin
process( addr, rom_out )
begin
rom_out <= rom_data(conv_integer(addr(8 downto 5)));
data_out <= rom_out( conv_integer(addr(4 downto 0))*8+7 downto conv_integer(addr(4 downto 0))*8);
end process;
end architecture rtl;
