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-- ------------------------------------------------------------------------

-- Copyright (C) 2005 Arif Endro Nugroho

-- All rights reserved.

-- 

-- Redistribution and use in source and binary forms, with or without

-- modification, are permitted provided that the following conditions

-- are met:

-- 

-- 1. Redistributions of source code must retain the above copyright

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-- 2. Redistributions in binary form must reproduce the above copyright

--    notice, this list of conditions and the following disclaimer in the

--    documentation and/or other materials provided with the distribution.

-- 3. The name of Arif Endro Nugroho may not be used to endorse or promote

--    products derived from this software without specific prior written

--    permission.

-- 

-- THIS SOFTWARE IS PROVIDED BY ARIF ENDRO NUGROHO "AS IS" AND ANY EXPRESS

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-- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

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-- End Of License.

-- ------------------------------------------------------------------------

library ieee;

use ieee.std_logic_1164.all;

use ieee.std_logic_unsigned.all;

entity bram_block_b is

  port (

    clk_b_i    : in  std_logic;

    we_b_i     : in  std_logic;

    en_b_i     : in  std_logic;

    di_b_i     : in  std_logic_vector (07 downto 00);

    addr_b_1_i : in  std_logic_vector (08 downto 00);

    addr_b_2_i : in  std_logic_vector (08 downto 00);

    do_b_1_o   : out std_logic_vector (07 downto 00);

    do_b_2_o   : out std_logic_vector (07 downto 00)

    );

end bram_block_b;

architecture blockram of bram_block_b is

  type bram_block is array (00 to 511) of std_logic_vector (07 downto 00);

  constant bram_block_b : bram_block :=

    (

      X"63", X"7c", X"77", X"7b", X"f2", X"6b", X"6f", X"c5", X"30", X"01", X"67", X"2b", X"fe", X"d7", X"ab", X"76",

      X"ca", X"82", X"c9", X"7d", X"fa", X"59", X"47", X"f0", X"ad", X"d4", X"a2", X"af", X"9c", X"a4", X"72", X"c0",

      X"b7", X"fd", X"93", X"26", X"36", X"3f", X"f7", X"cc", X"34", X"a5", X"e5", X"f1", X"71", X"d8", X"31", X"15",

      X"04", X"c7", X"23", X"c3", X"18", X"96", X"05", X"9a", X"07", X"12", X"80", X"e2", X"eb", X"27", X"b2", X"75",

      X"09", X"83", X"2c", X"1a", X"1b", X"6e", X"5a", X"a0", X"52", X"3b", X"d6", X"b3", X"29", X"e3", X"2f", X"84",

      X"53", X"d1", X"00", X"ed", X"20", X"fc", X"b1", X"5b", X"6a", X"cb", X"be", X"39", X"4a", X"4c", X"58", X"cf",

      X"d0", X"ef", X"aa", X"fb", X"43", X"4d", X"33", X"85", X"45", X"f9", X"02", X"7f", X"50", X"3c", X"9f", X"a8",

      X"51", X"a3", X"40", X"8f", X"92", X"9d", X"38", X"f5", X"bc", X"b6", X"da", X"21", X"10", X"ff", X"f3", X"d2",

      X"cd", X"0c", X"13", X"ec", X"5f", X"97", X"44", X"17", X"c4", X"a7", X"7e", X"3d", X"64", X"5d", X"19", X"73",

      X"60", X"81", X"4f", X"dc", X"22", X"2a", X"90", X"88", X"46", X"ee", X"b8", X"14", X"de", X"5e", X"0b", X"db",

      X"e0", X"32", X"3a", X"0a", X"49", X"06", X"24", X"5c", X"c2", X"d3", X"ac", X"62", X"91", X"95", X"e4", X"79",

      X"e7", X"c8", X"37", X"6d", X"8d", X"d5", X"4e", X"a9", X"6c", X"56", X"f4", X"ea", X"65", X"7a", X"ae", X"08",

      X"ba", X"78", X"25", X"2e", X"1c", X"a6", X"b4", X"c6", X"e8", X"dd", X"74", X"1f", X"4b", X"bd", X"8b", X"8a",

      X"70", X"3e", X"b5", X"66", X"48", X"03", X"f6", X"0e", X"61", X"35", X"57", X"b9", X"86", X"c1", X"1d", X"9e",

      X"e1", X"f8", X"98", X"11", X"69", X"d9", X"8e", X"94", X"9b", X"1e", X"87", X"e9", X"ce", X"55", X"28", X"df",

      X"8c", X"a1", X"89", X"0d", X"bf", X"e6", X"42", X"68", X"41", X"99", X"2d", X"0f", X"b0", X"54", X"bb", X"16",

-- inv_subbytes

      X"52", X"09", X"6a", X"d5", X"30", X"36", X"a5", X"38", X"bf", X"40", X"a3", X"9e", X"81", X"f3", X"d7", X"fb",

      X"7c", X"e3", X"39", X"82", X"9b", X"2f", X"ff", X"87", X"34", X"8e", X"43", X"44", X"c4", X"de", X"e9", X"cb",

      X"54", X"7b", X"94", X"32", X"a6", X"c2", X"23", X"3d", X"ee", X"4c", X"95", X"0b", X"42", X"fa", X"c3", X"4e",

      X"08", X"2e", X"a1", X"66", X"28", X"d9", X"24", X"b2", X"76", X"5b", X"a2", X"49", X"6d", X"8b", X"d1", X"25",

      X"72", X"f8", X"f6", X"64", X"86", X"68", X"98", X"16", X"d4", X"a4", X"5c", X"cc", X"5d", X"65", X"b6", X"92",

      X"6c", X"70", X"48", X"50", X"fd", X"ed", X"b9", X"da", X"5e", X"15", X"46", X"57", X"a7", X"8d", X"9d", X"84",

      X"90", X"d8", X"ab", X"00", X"8c", X"bc", X"d3", X"0a", X"f7", X"e4", X"58", X"05", X"b8", X"b3", X"45", X"06",

      X"d0", X"2c", X"1e", X"8f", X"ca", X"3f", X"0f", X"02", X"c1", X"af", X"bd", X"03", X"01", X"13", X"8a", X"6b",

      X"3a", X"91", X"11", X"41", X"4f", X"67", X"dc", X"ea", X"97", X"f2", X"cf", X"ce", X"f0", X"b4", X"e6", X"73",

      X"96", X"ac", X"74", X"22", X"e7", X"ad", X"35", X"85", X"e2", X"f9", X"37", X"e8", X"1c", X"75", X"df", X"6e",

      X"47", X"f1", X"1a", X"71", X"1d", X"29", X"c5", X"89", X"6f", X"b7", X"62", X"0e", X"aa", X"18", X"be", X"1b",

      X"fc", X"56", X"3e", X"4b", X"c6", X"d2", X"79", X"20", X"9a", X"db", X"c0", X"fe", X"78", X"cd", X"5a", X"f4",

      X"1f", X"dd", X"a8", X"33", X"88", X"07", X"c7", X"31", X"b1", X"12", X"10", X"59", X"27", X"80", X"ec", X"5f",

      X"60", X"51", X"7f", X"a9", X"19", X"b5", X"4a", X"0d", X"2d", X"e5", X"7a", X"9f", X"93", X"c9", X"9c", X"ef",

      X"a0", X"e0", X"3b", X"4d", X"ae", X"2a", X"f5", X"b0", X"c8", X"eb", X"bb", X"3c", X"83", X"53", X"99", X"61",

      X"17", X"2b", X"04", X"7e", X"ba", X"77", X"d6", X"26", X"e1", X"69", X"14", X"63", X"55", X"21", X"0c", X"7d"

      );

  signal addr_b_1 : std_logic_vector (08 downto 00);

  signal addr_b_2 : std_logic_vector (08 downto 00);

begin

  process (clk_b_i)

  begin

    if (clk_b_i = '1' and clk_b_i'event) then

      if (en_b_i = '1') then

        if (we_b_i = '1') then

--        bram_block_b (conv_integer(addr_b_1_i)) <= di_b_i;

        end if;

        addr_b_1                                  <= addr_b_1_i;

        addr_b_2                                  <= addr_b_2_i;

      end if;

    end if;

  end process;

  do_b_1_o <= bram_block_b (conv_integer(addr_b_1));

  do_b_2_o <= bram_block_b (conv_integer(addr_b_2));

end blockram;