sender.vhd.bak

atm信元检测

LIBRARY IEEE;        
USE     IEEE.Std_Logic_1164.ALL;
USE     IEEE.std_logic_unsigned.all;
USE     IEEE.std_logic_arith.all;

entity sender is
    port(
        clk:   in std_logic;
        rst:   in std_logic;
        send_bit:   out std_logic
        );
end sender;

use work.all;
architecture rtl of sender is

type noise_additive is array(0 to 63) of std_logic_vector(0 to 39);
signal header:      std_logic_vector(39 downto 0);
signal data:        std_logic_vector(383 downto 0);
signal header_flag:   std_logic;
signal info_bit:      std_logic;
signal crc_flag:      std_logic;
signal code_bit:      std_logic;
signal counter:     integer range 0 to 424;
signal period:      integer range 0 to 64;
signal noise:       noise_additive;
signal noise_bit:   std_logic;

    
component encoder
    port(
        clk:           in  std_logic;
        rst:           in  std_logic;
        header_flag:   in  std_logic;
        info_bit:      in  std_logic;
        crc_flag:      in  std_logic;
        code_bit:      out std_logic);
end component;
   
begin
    atm_encoder:encoder port map(clk,rst,header_flag,info_bit,crc_flag,code_bit);
    send_bit <= code_bit xor noise_bit;
--    send_bit <= code_bit;
    process(clk,rst,counter,period)
    variable counter_v:     integer range 0 to 424;
    begin
        counter_v := counter;
        if(rst='0') then
            header <= x"A423F27900";
            data <= x"111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111";
            header_flag <= '0';
            info_bit <= '0';
            crc_flag <= '0';      
            counter <= 315;
            period <= 0;
            noise_bit <= '0';
            noise(0) <= x"0000000000";
            noise(1) <= x"0000000000";
            noise(2) <= x"0000000000";
            noise(3) <= x"1000000000";
            noise(4) <= x"0400000000";
            noise(5) <= x"0000000000";
            noise(6) <= x"0000000000";
            noise(7) <= x"0000000000";
            noise(8) <= x"0000000000";
            noise(9) <= x"0001000000";
            noise(10) <= x"0000000001";
            noise(11) <= x"0000000000";
            noise(12) <= x"0010010000";
            noise(13) <= x"0000100000";
            noise(14) <= x"0000000000";
            noise(15) <= x"0001000000";
            noise(16) <= x"0000001000";
            noise(17) <= x"0100010000";
            noise(18) <= x"0010000100";
            noise(19) <= x"1000000000"; 
            noise(20) <= x"0000000000";
            noise(21) <= x"0000000000";
            noise(22) <= x"0000000000";
            noise(23) <= x"0000000000";
            noise(24) <= x"0700000000";
            noise(25) <= x"0005000000";
            noise(26) <= x"0000000007";
            noise(27) <= x"0000000000";
            noise(28) <= x"1000000000";
            noise(29) <= x"0050000000"; 
            noise(30) <= x"0000000000";
            noise(31) <= x"7000000000";
            noise(32) <= x"0000000000";
            noise(33) <= x"0000000000";
            noise(34) <= x"0000000000";
            noise(35) <= x"0000000000";
            noise(36) <= x"0000000000";
            noise(37) <= x"0000000000";
            noise(38) <= x"0000000000";
            noise(39) <= x"0000000000";
            noise(40) <= x"0000000000";
            noise(41) <= x"0000000000";
            noise(42) <= x"0000000000";
            noise(43) <= x"0000000000";
            noise(44) <= x"0000000000";
            noise(45) <= x"0000000000";
            noise(46) <= x"0000000000";
            noise(47) <= x"0000000000";
            noise(48) <= x"0000000000";
            noise(49) <= x"0000000000";
            noise(50) <= x"0000000000";
            noise(51) <= x"0000000000";
            noise(52) <= x"0000000000";
            noise(53) <= x"0000000000";
            noise(54) <= x"0000000000";
            noise(55) <= x"0000000000";
            noise(56) <= x"0000000000";
            noise(57) <= x"0000000000";
            noise(58) <= x"0000000000";
            noise(59) <= x"0000000000";  
            noise(60) <= x"0000000000";
            noise(61) <= x"0000000000";
            noise(62) <= x"0000000000";
            noise(63) <= x"0000000000";                                                                                                                                        
        else
           if(clk'event and clk='1') then
               if(counter_v=424) then
                   counter_v:=1;
                   if(period=63) then
                       period <= 0;
                   else
                       period <= period +1;
                   end if;
               else
                   counter_v := counter_v+1;
               end if;
               counter <= counter_v;
               if(counter_v<=40) then
                   info_bit <= header(40-counter_v);
               else
                   info_bit <= data(384-counter_v+40);
               end if;
               if(counter_v=1) then
                   header_flag <= '1';
               else if(counter_v=33) then
                        crc_flag <= '1';
                        header_flag <='0';
                    else if(counter_v=41) then
                             crc_flag <= '0';
                         end if;
                    end if;
               end if;
               if(counter_v<42 and counter_v>1) then
                   noise_bit <= noise(period)(counter_v-2);
               else
                   noise_bit <= '0';
               end if;
           end if;
       end if;
    end process; 
    

end rtl;