0

コード:

        library IEEE;
        use IEEE.std_logic_1164.all;
        use ieee.numeric_std.all;
        use ieee.std_logic_unsigned.all;
        entity decoder10 is 
        port( in_data:  in STD_LOGIC_VECTOR (7 downto 0);
                clk : in STD_LOGIC;
                out_data:  out STD_LOGIC_VECTOR (7 downto 0));
        end decoder10;

        architecture behavioral of decoder10 is
        signal int_bus1 : STD_LOGIC_VECTOR (63 downto 0);
        signal int_bus2 : STD_LOGIC_VECTOR (63 downto 0);
        signal int_bus3 : STD_LOGIC_VECTOR (31 downto 0);
        signal lower : STD_LOGIC_VECTOR (31 downto 0);
        signal higher : STD_LOGIC_VECTOR (31 downto 0);
        signal intermid : STD_LOGIC_VECTOR (31 downto 0);
        signal curr_key : STD_LOGIC_VECTOR (31 downto 0);
        signal got_data: std_logic;      --data written in    
        signal variable_test: std_logic:= '0';      
        signal n_ready: std_logic; --code assembled
        signal k_ready: std_logic; --key selected
        signal k_added: std_logic; --key added
        signal sub_ready: std_logic; --blocks substituted
        signal sh_ready: std_logic; --shift done
        signal xor_ready: std_logic; --xor done
        signal out_ready: std_logic; --ready for output
        signal sent_data: std_logic; --data written out  
        signal start_again: std_logic; --start the main step again
        type arr is array (0 to 15) of std_logic_vector(31 downto 0);
        type key is array (0 to 7) of std_logic_vector(31 downto 0);
        type key_num is array (0 to 31) of integer;
        signal key_it : key_num := (0,1,2,3,4,5,6,7,
                                             7,6,5,4,3,2,1,0,
                                             7,6,5,4,3,2,1,0,
                                             7,6,5,4,3,2,1,0);

        signal tab : arr := (X"00000001",
                                    X"00000002",
                                    X"00000003",
                                    X"00000004",
                                    X"00000005",
                                    X"00000006",
                                    X"00000007",
                                    X"00000008",
                                    X"00000009",
                                    X"0000000a",
                                    X"0000000b",
                                    X"0000000c",
                                    X"0000000d",
                                    X"0000000e",
                                    X"0000000f",
                                    X"00000000");  

        signal tab_key : key := (X"00000007",
                                         X"00000006",
                                         X"00000005",
                                         X"00000004",
                                         X"00000003",
                                         X"00000002",
                                         X"00000001",
                                         X"00000000");

        component adder is 
        port(   dataa       : IN STD_LOGIC_VECTOR (31 DOWNTO 0);
                datab       : IN STD_LOGIC_VECTOR (31 DOWNTO 0);
                result      : OUT STD_LOGIC_VECTOR (31 DOWNTO 0));
        END component;

        begin

        add1: adder
            port map (lower, curr_key, int_bus3);

        process (clk, in_data)
        variable i: INTEGER := 0;
        variable j: INTEGER := 0;
        variable k: INTEGER := 0;


        begin
          -- assembling input code into one piece
          if (rising_edge(clk)) then
              if (i<8) then
                 int_bus1(63 downto 56)<=in_data;
                got_data <= '1';
                n_ready <= '0';
                 if (got_data = '1') then 
                     --shift right 8 bits 
                     int_bus1(55 downto 0) <= int_bus1(63 downto 8);
                     i := i + 1;
                     got_data <= '0';
                 end if;
              end if;

                 if (i = 8 and n_ready = '0' and out_ready = '0') then
                     lower<=int_bus1(31 downto 0);
                     higher<=int_bus1(63 downto 32);
                     n_ready <= '1';
                     start_again <= '1';
                 end if;
          end if; 



          if (n_ready ='1') then
          -- base encryption step
             if (rising_edge(clk)) then
             if (j <32 and start_again = '1') then
             -- key/step dependence
                 curr_key <= tab_key(key_it(j));
                k_ready <= '1';
                start_again <= '0';
             end if;   

             if (k_ready = '1') then 
                    lower <= curr_key + lower;
                    k_added <= '1';
                    k_ready <='0';
             end if;

             if (k_added = '1') then
                    --block substitution
                    lower(3 downto 0) <= tab(CONV_INTEGER(lower(3 downto 0)))(3 downto 0);
                    lower(7 downto 4) <= tab(CONV_INTEGER(lower(7 downto 4)))(7 downto 4);
                    lower(11 downto 8) <= tab(CONV_INTEGER(lower(11 downto 8)))(11 downto 8);
                    lower(15 downto 12) <= tab(CONV_INTEGER(lower(15 downto 12)))(15 downto 12);
                    lower(19 downto 16) <= tab(CONV_INTEGER(lower(19 downto 16)))(19 downto 16);
                    lower(23 downto 20) <= tab(CONV_INTEGER(lower(23 downto 20)))(23 downto 20);
                    lower(27 downto 24) <= tab(CONV_INTEGER(lower(27 downto 24)))(27 downto 24);
                    lower(31 downto 28) <= tab(CONV_INTEGER(lower(31 downto 28)))(31 downto 28);
                    sub_ready <= '1';
                    k_added <= '0';
             end if;    

             if (sub_ready = '1') then
                  --shift 11 bits right cyclically
                    lower(31 downto 21) <= lower(10 downto 0);
                    lower(20 downto 0) <= lower(31 downto 11);
                    sh_ready<= '1';
                    sub_ready <= '0';
             end if;

             if (sh_ready = '1') then
                    higher <= lower xor higher;
                    lower <= higher;
                    sh_ready<= '0';
                    j:=j+1;
                    start_again <= '1';
                    out_ready <= '0'; 
              end if;
              end if; 
             end if;     

         if (rising_edge(clk)) then
              if (j = 32 and out_ready = '0') then
                j:=j+1;
                variable_test <= '1'; --artifact of testing the behavior of variables
              end if;   


         end if;
          -- assembling output code into one piece
          if (rising_edge(clk)) then  
            if (out_ready = '0' and variable_test = '1') then
                 int_bus2 (63 downto 32) <= higher;
                 int_bus2 (31 downto 0) <= lower;
                 out_ready <= '1';
                 n_ready <= '0';
            end if;

             if (out_ready = '1' and k<8) then
                 out_data<=int_bus2(7 downto 0);
                 sent_data <= '1';
                 if (sent_data ='1') then 
                    --shift right 8 bits 
                     int_bus2(55 downto 0) <= int_bus2(63 downto 8);
                     k := k + 1;
                     sent_data <= '0';
                 end if;
            end if;
         end if;
        end process; 
        end behavioral;

そして、次のエラーが発生します。

エラー ( 10821 ):decoder10.vhd(106) での HDL エラー:start_againサポートされているレジスタ モデルと動作が一致しないため、レジスタを推測できません
情報 (10041): start_againdecoder10.vhd(75) での推測されたラッチ
:decoder10.vhd(106) での HDL エラー:higher[0]サポートされているレジスタ モデルと動作が一致しないため、レジスタを推測できません
情報 (10041): higher[0]decoder10.vhd(75) での推測されたラッチ
(これは最初の 18 ビットで続きます) 「より高い」の)

なんで合成しないの?そして、なぜ最初の 18 ビットしかhigher推論できないのでしょうか?

4

2 に答える 2

1

おそらく、クロック イネーブルの優先度がクロックよりも高く、これを可能にする FPGA ハードウェアが存在しないことが原因です。合成用のコードを記述するときはいつでも、これが実際に基盤となるハードウェアにマップできるかどうかを考える必要があります。だから代わりに

if (n_ready ='1') then
  -- base encryption step
  if (rising_edge(clk)) then
    (...)

試す:

if(rising_edge(clk)) then
  if(n_ready = '1') then
    (...)

Get your priority rightをご覧ください。ザイリンクス FPGA 向けに書かれていますが、他のメーカーにも同様のことが当てはまると思います。

于 2012-05-01T06:15:02.307 に答える