Subversion Repositories mini_aes

-- $Id: bram_block_b.vhdl,v 1.1.1.1 2005-12-06 02:48:32 arif_endro Exp $
-------------------------------------------------------------------------------
-- Title       : Block RAM
-- Project     : Mini AES 128 
-------------------------------------------------------------------------------
-- File        : bram_block_b.vhdl
-- Author      : "Arif E. Nugroho" <arif_endro@yahoo.com>
-- Created     : 2005/12/03
-- Last update : 
-- Simulators  : ModelSim SE PLUS 6.0
-- Synthesizers: ISE Xilinx 6.3i
-- Target      : 
-------------------------------------------------------------------------------
-- Description : Second block RAM used in AES implementation.
-------------------------------------------------------------------------------
-- Copyright (C) 2005 Arif E. Nugroho
-- This VHDL design file is an open design; you can redistribute it and/or
-- modify it and/or implement it after contacting the author
-------------------------------------------------------------------------------
-------------------------------------------------------------------------------
-- 
--         THIS SOURCE FILE MAY BE USED AND DISTRIBUTED WITHOUT RESTRICTION
-- PROVIDED THAT THIS COPYRIGHT STATEMENT IS NOT REMOVED FROM THE FILE AND THAT
-- ANY DERIVATIVE WORK CONTAINS THE ORIGINAL COPYRIGHT NOTICE AND THE
-- ASSOCIATED DISCLAIMER.
-- 
-------------------------------------------------------------------------------
-- 
--         THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
-- IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
-- MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
-- EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
-- OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-- WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
-- OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
-- ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-- 
-------------------------------------------------------------------------------
 
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;