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[/] [System09/] [rev_86/] [rtl/] [Spartan3/] [keymap_rom_slice.vhd] - Rev 210
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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;
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