rom2vhdl

#!/bin/sh

# A shell script for generating main_roms.vhd and disk_ii_rom.vhd
#
# Usage:
#
# ./rom2vhdl main_roms 13 12287 < apple_II.rom > main_roms.vhd
#
# ./rom2vhdl disk_ii_rom 7 255 < slot6.rom > disk_ii_rom.vhd

echo "library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;

entity $1 is
 port (
   addr : in  unsigned($2 downto 0);
   clk  : in  std_logic;
   dout : out unsigned(7 downto 0));
end $1;

architecture rtl of $1 is
  type rom_array is array(0 to $3) of unsigned(7 downto 0);

  constant ROM : rom_array := ("

od --format x1 --address-radix=n --output-duplicates --width=8 | awk 'NR > 1 { printf(",\n") }
  {printf "     X\"%s\", X\"%s\", X\"%s\", X\"%s\", X\"%s\", X\"%s\", X\"%s\", X\"%s\"", $1, $2, $3, $4, $5, $6, $7, $8}'

echo ");

begin

process (clk)
  begin
    if rising_edge(clk) then
      dout <= ROM(TO_INTEGER(addr));
    end if;
  end process;

end rtl;"