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zpekic |
----------------------------------------------------------------------------------
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-- Company:
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-- Engineer:
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--
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-- Create Date: 11:56:00 11/12/2017
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-- Design Name:
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-- Module Name: hexfilerom - Behavioral
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-- Project Name:
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-- Target Devices:
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-- Tool versions:
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-- Description:
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--
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-- Dependencies:
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--
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-- Revision:
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-- Revision 0.01 - File Created
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-- Additional Comments:
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--
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----------------------------------------------------------------------------------
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library IEEE;
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use IEEE.STD_LOGIC_1164.ALL;
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use STD.textio.all;
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use ieee.std_logic_textio.all;
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-- Uncomment the following library declaration if using
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-- arithmetic functions with Signed or Unsigned values
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use IEEE.NUMERIC_STD.ALL;
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-- Uncomment the following library declaration if instantiating
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-- any Xilinx primitives in this code.
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--library UNISIM;
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--use UNISIM.VComponents.all;
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entity hexfilerom is
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generic (
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filename: string := "";
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address_size: positive := 8;
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default_value: STD_LOGIC_VECTOR(7 downto 0) := X"FF");
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Port (
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D : out STD_LOGIC_VECTOR (7 downto 0);
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A : in STD_LOGIC_VECTOR ((address_size - 1) downto 0);
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nRead : in STD_LOGIC;
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nSelect : in STD_LOGIC);
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end hexfilerom;
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architecture Behavioral of hexfilerom is
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COMPONENT rom4kx8
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PORT (
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clka : IN STD_LOGIC;
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addra : IN STD_LOGIC_VECTOR(11 DOWNTO 0);
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douta : OUT STD_LOGIC_VECTOR(7 DOWNTO 0)
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);
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END COMPONENT;
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type bytememory is array(0 to (2 ** address_size) - 1) of std_logic_vector(7 downto 0);
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impure function init_inlinememory(depth: in integer; default_value: std_logic_vector(7 downto 0)) return bytememory is
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variable temp_mem : bytememory;
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variable i: integer range 0 to (depth - 1);
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variable location: std_logic_vector(7 downto 0);
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begin
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-- fill with default value
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for i in 0 to depth - 1 loop
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location := std_logic_vector(to_unsigned(i, 8));
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case location is
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------- RST0 @ 0x00 --------
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when X"00" =>
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temp_mem(i) := X"F3"; -- DI
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when X"01" =>
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temp_mem(i) := X"21"; -- LXI H, 0x0000
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when X"02" =>
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temp_mem(i) := X"00";
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when X"03" =>
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temp_mem(i) := X"00";
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when X"04" =>
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temp_mem(i) := X"2B"; -- DCX H
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when X"05" =>
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temp_mem(i) := X"F9"; -- SPHL
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when X"06" =>
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temp_mem(i) := X"FB"; -- EI
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when X"07" =>
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temp_mem(i) := X"00"; -- NOP
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when X"08" =>
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temp_mem(i) := X"AF"; -- XRA A
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when X"09" =>
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temp_mem(i) := X"37"; -- STC
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when X"0A" =>
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temp_mem(i) := X"76"; -- HLT ; interrupt is needed to go further
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when X"0B" =>
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temp_mem(i) := X"01"; -- DeadLoop: LXI B, 0x0D20; set C to ASCII space
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when X"0C" =>
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temp_mem(i) := X"20";
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when X"0D" =>
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temp_mem(i) := X"0D";
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when X"0E" =>
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temp_mem(i) := X"79"; -- SendNextChar: MOV A, C
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when X"0F" =>
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temp_mem(i) := X"D3"; -- OUT 0x00; send char
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when X"10" =>
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temp_mem(i) := X"00";
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when X"11" =>
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temp_mem(i) := X"FE"; -- CPI 07FH; end of printable chars reached?
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when X"12" =>
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temp_mem(i) := X"7F";
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when X"13" =>
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temp_mem(i) := X"F2"; -- JP NextLine
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when X"14" =>
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temp_mem(i) := X"1A";
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when X"15" =>
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temp_mem(i) := X"00";
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when X"16" =>
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temp_mem(i) := X"0C"; -- INR C
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when X"17" =>
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temp_mem(i) := X"C3"; -- JMP SendNextChar
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when X"18" =>
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temp_mem(i) := X"0E";
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when X"19" =>
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temp_mem(i) := X"00";
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when X"1A" =>
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temp_mem(i) := X"78"; -- NextLine: MOV A, B
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when X"1B" =>
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temp_mem(i) := X"D3"; -- OUT 0x00; send char
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when X"1C" =>
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temp_mem(i) := X"00";
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when X"1D" =>
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temp_mem(i) := X"EE"; -- XRI A, 00000110B
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when X"1E" =>
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temp_mem(i) := X"06";
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when X"1F" =>
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temp_mem(i) := X"D3"; -- OUT 0x00; send char
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when X"20" =>
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temp_mem(i) := X"00";
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when X"21" =>
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temp_mem(i) := X"C3"; -- JMP DeadLoop
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when X"22" =>
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temp_mem(i) := X"0B";
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when X"23" =>
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temp_mem(i) := X"00";
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when X"24" =>
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temp_mem(i) := X"00";
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when X"25" =>
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temp_mem(i) := X"00";
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when X"26" =>
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temp_mem(i) := X"00";
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when X"27" =>
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temp_mem(i) := X"00";
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------- RST5 @ 0x28 --------
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when X"28" =>
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temp_mem(i) := X"C3"; -- JMP RST7
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when X"29" =>
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temp_mem(i) := X"38";
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when X"2A" =>
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temp_mem(i) := X"00";
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------- RST6 @ 0x30 --------
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when X"30" =>
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temp_mem(i) := X"C3"; -- JMP RST7
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when X"31" =>
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temp_mem(i) := X"38";
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when X"32" =>
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temp_mem(i) := X"00";
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------- RST7 @ 0x38 --------
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when X"38" =>
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temp_mem(i) := X"F3"; -- DI
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when X"39" =>
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temp_mem(i) := X"F5"; -- PUSH PSW
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when X"3A" =>
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temp_mem(i) := X"E5"; -- PUSH H
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when X"3B" =>
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temp_mem(i) := X"3E"; -- MVI A, '*'
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when X"3C" =>
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temp_mem(i) := X"2A";
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when X"3D" =>
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temp_mem(i) := X"D3"; -- OUT 00H
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when X"3E" =>
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temp_mem(i) := X"00";
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when X"3F" =>
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temp_mem(i) := X"E1"; -- POP H
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when X"40" =>
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temp_mem(i) := X"F1"; -- POP PSW
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when X"41" =>
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temp_mem(i) := X"FB"; -- RETI: EI
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when X"42" =>
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temp_mem(i) := X"C9"; -- RET
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when X"43" =>
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temp_mem(i) := X"00"; -- NOP
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-----------------------------
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when others =>
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temp_mem(i) := default_value;
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end case;
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end loop;
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return temp_mem;
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end init_inlinememory;
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impure function init_filememory(file_name : in string; depth: in integer; default_value: std_logic_vector(7 downto 0)) return bytememory is
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variable temp_mem : bytememory;
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variable i, addr_start, addr_end: integer range 0 to (depth - 1);
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variable location: std_logic_vector(7 downto 0);
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file input_file : text open read_mode is file_name;
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variable input_line : line;
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variable line_current: integer := 0;
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variable address: std_logic_vector(15 downto 0);
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variable byte_count, record_type, byte_value: std_logic_vector(7 downto 0);
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variable firstChar: character;
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variable count: integer;
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variable isOk: boolean;
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begin
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-- fill with default value
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for i in 0 to depth - 1 loop
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temp_mem(i) := default_value;
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end loop;
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-- parse the file for the data
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-- format described here: https://en.wikipedia.org/wiki/Intel_HEX
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assert false report file_name & ": loading up to " & integer'image(depth) & " bytes." severity note;
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loop
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line_current := line_current + 1;
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readline (input_file, input_line);
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exit when endfile(input_file); --till the end of file is reached continue.
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read(input_line, firstChar);
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if (firstChar = ':') then
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hread(input_line, byte_count);
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hread(input_line, address);
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hread(input_line, record_type);
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case record_type is
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when X"00" => -- DATA
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count := to_integer(unsigned(byte_count));
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if (count > 0) then
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addr_start := to_integer(unsigned(address));
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addr_end := addr_start + to_integer(unsigned(byte_count)) - 1;
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report file_name & ": parsing line " & integer'image(line_current) & " for " & integer'image(count) & " bytes at address " & integer'image(addr_start) severity note;
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for i in addr_start to addr_end loop
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hread(input_line, byte_value);
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if (i < depth) then
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temp_mem(i) := byte_value;
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else
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report file_name & ": line " & integer'image(line_current) & " data beyond memory capacity ignored" severity note;
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end if;
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end loop;
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else
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report file_name & ": line " & integer'image(line_current) & " has no data" severity note;
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end if;
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when X"01" => -- EOF
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report file_name & ": line " & integer'image(line_current) & " eof record type detected" severity note;
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exit;
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when others =>
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report file_name & ": line " & integer'image(line_current) & " unsupported record type detected" severity failure;
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end case;
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else
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report file_name & ": line " & integer'image(line_current) & " does not start with ':' " severity failure;
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end if;
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end loop; -- next line in file
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file_close(input_file);
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return temp_mem;
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end init_filememory;
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signal rom: bytememory := init_filememory(filename, 2 ** address_size, default_value);
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--signal rom: bytememory := init_inlinememory(2 ** address_size, default_value);
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attribute ram_style: string;
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attribute ram_style of rom: signal is "block";
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begin
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D <= rom(to_integer(unsigned(A))) when (nRead = '0' and nSelect = '0') else "ZZZZZZZZ";
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end Behavioral;
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