subsystem14_entity1.vhd

这是一个计算维特比译码的程序

-- -------------------------------------------------------------
--
-- Module: Subsystem14_entity1
-- Simulink Path: hdlcoderviterbi/viterbi_block/Traceback/Subsystem14
-- Created: 2009-03-24 16:23:55
-- Hierarchy Level: 2
--
--
-- -------------------------------------------------------------
LIBRARY IEEE;
USE IEEE.std_logic_1164.ALL;
USE IEEE.numeric_std.ALL;

ENTITY Subsystem14_entity1 IS
  PORT( clk                               :   IN    std_logic;
        reset                             :   IN    std_logic;
        enb                               :   IN    std_logic;
        In1                               :   IN    std_logic_vector(0 TO 63);  -- boolean [64]
        In2                               :   IN    std_logic_vector(7 DOWNTO 0);  
        Out1                              :   OUT   std_logic_vector(0 TO 63);  -- boolean [64]
        Out2                              :   OUT   std_logic_vector(7 DOWNTO 0)  
        );
END Subsystem14_entity1;


ARCHITECTURE rtl OF Subsystem14_entity1 IS

  -- Constants
  CONSTANT Bitwise_AND_with_Mask_const    : unsigned(7 DOWNTO 0) := to_unsigned(62, 8);  -- uint8

  -- Signals
  SIGNAL Unit_Delay_out1                  : std_logic_vector(0 TO 63);  -- boolean [64]
  SIGNAL s                                : unsigned(7 DOWNTO 0);  -- uint8
  SIGNAL Variable_Selector_out1           : std_logic;
  SIGNAL Data_Type_Conversion_out1        : unsigned(7 DOWNTO 0);  -- uint8
  SIGNAL Shift_Arithmetic_out1            : unsigned(7 DOWNTO 0);  -- uint8
  SIGNAL Bitwise_AND_with_Mask_out1       : unsigned(7 DOWNTO 0);  -- uint8
  SIGNAL Bitwise_Operator_out1            : unsigned(7 DOWNTO 0);  -- uint8

BEGIN
  Unit_Delay_process : PROCESS (clk, reset)
  BEGIN
    IF reset = '1' THEN
      Unit_Delay_out1 <= (OTHERS => '0');
    ELSIF clk'event AND clk = '1' THEN
      IF enb = '1' THEN
        Unit_Delay_out1(0 TO 63) <= In1(0 TO 63);
      END IF;
    END IF; 
  END PROCESS Unit_Delay_process;


  Out1 <= Unit_Delay_out1;

  s <= unsigned(In2);

  Variable_Selector_out1 <= In1(0) WHEN ( s=to_unsigned(0, 8) ) ELSE
                               In1(1) WHEN ( s=to_unsigned(1, 8) ) ELSE
                               In1(2) WHEN ( s=to_unsigned(2, 8) ) ELSE
                               In1(3) WHEN ( s=to_unsigned(3, 8) ) ELSE
                               In1(4) WHEN ( s=to_unsigned(4, 8) ) ELSE
                               In1(5) WHEN ( s=to_unsigned(5, 8) ) ELSE
                               In1(6) WHEN ( s=to_unsigned(6, 8) ) ELSE
                               In1(7) WHEN ( s=to_unsigned(7, 8) ) ELSE
                               In1(8) WHEN ( s=to_unsigned(8, 8) ) ELSE
                               In1(9) WHEN ( s=to_unsigned(9, 8) ) ELSE
                               In1(10) WHEN ( s=to_unsigned(10, 8) ) ELSE
                               In1(11) WHEN ( s=to_unsigned(11, 8) ) ELSE
                               In1(12) WHEN ( s=to_unsigned(12, 8) ) ELSE
                               In1(13) WHEN ( s=to_unsigned(13, 8) ) ELSE
                               In1(14) WHEN ( s=to_unsigned(14, 8) ) ELSE
                               In1(15) WHEN ( s=to_unsigned(15, 8) ) ELSE
                               In1(16) WHEN ( s=to_unsigned(16, 8) ) ELSE
                               In1(17) WHEN ( s=to_unsigned(17, 8) ) ELSE
                               In1(18) WHEN ( s=to_unsigned(18, 8) ) ELSE
                               In1(19) WHEN ( s=to_unsigned(19, 8) ) ELSE
                               In1(20) WHEN ( s=to_unsigned(20, 8) ) ELSE
                               In1(21) WHEN ( s=to_unsigned(21, 8) ) ELSE
                               In1(22) WHEN ( s=to_unsigned(22, 8) ) ELSE
                               In1(23) WHEN ( s=to_unsigned(23, 8) ) ELSE
                               In1(24) WHEN ( s=to_unsigned(24, 8) ) ELSE
                               In1(25) WHEN ( s=to_unsigned(25, 8) ) ELSE
                               In1(26) WHEN ( s=to_unsigned(26, 8) ) ELSE
                               In1(27) WHEN ( s=to_unsigned(27, 8) ) ELSE
                               In1(28) WHEN ( s=to_unsigned(28, 8) ) ELSE
                               In1(29) WHEN ( s=to_unsigned(29, 8) ) ELSE
                               In1(30) WHEN ( s=to_unsigned(30, 8) ) ELSE
                               In1(31) WHEN ( s=to_unsigned(31, 8) ) ELSE
                               In1(32) WHEN ( s=to_unsigned(32, 8) ) ELSE
                               In1(33) WHEN ( s=to_unsigned(33, 8) ) ELSE
                               In1(34) WHEN ( s=to_unsigned(34, 8) ) ELSE
                               In1(35) WHEN ( s=to_unsigned(35, 8) ) ELSE
                               In1(36) WHEN ( s=to_unsigned(36, 8) ) ELSE
                               In1(37) WHEN ( s=to_unsigned(37, 8) ) ELSE
                               In1(38) WHEN ( s=to_unsigned(38, 8) ) ELSE
                               In1(39) WHEN ( s=to_unsigned(39, 8) ) ELSE
                               In1(40) WHEN ( s=to_unsigned(40, 8) ) ELSE
                               In1(41) WHEN ( s=to_unsigned(41, 8) ) ELSE
                               In1(42) WHEN ( s=to_unsigned(42, 8) ) ELSE
                               In1(43) WHEN ( s=to_unsigned(43, 8) ) ELSE
                               In1(44) WHEN ( s=to_unsigned(44, 8) ) ELSE
                               In1(45) WHEN ( s=to_unsigned(45, 8) ) ELSE
                               In1(46) WHEN ( s=to_unsigned(46, 8) ) ELSE
                               In1(47) WHEN ( s=to_unsigned(47, 8) ) ELSE
                               In1(48) WHEN ( s=to_unsigned(48, 8) ) ELSE
                               In1(49) WHEN ( s=to_unsigned(49, 8) ) ELSE
                               In1(50) WHEN ( s=to_unsigned(50, 8) ) ELSE
                               In1(51) WHEN ( s=to_unsigned(51, 8) ) ELSE
                               In1(52) WHEN ( s=to_unsigned(52, 8) ) ELSE
                               In1(53) WHEN ( s=to_unsigned(53, 8) ) ELSE
                               In1(54) WHEN ( s=to_unsigned(54, 8) ) ELSE
                               In1(55) WHEN ( s=to_unsigned(55, 8) ) ELSE
                               In1(56) WHEN ( s=to_unsigned(56, 8) ) ELSE
                               In1(57) WHEN ( s=to_unsigned(57, 8) ) ELSE
                               In1(58) WHEN ( s=to_unsigned(58, 8) ) ELSE
                               In1(59) WHEN ( s=to_unsigned(59, 8) ) ELSE
                               In1(60) WHEN ( s=to_unsigned(60, 8) ) ELSE
                               In1(61) WHEN ( s=to_unsigned(61, 8) ) ELSE
                               In1(62) WHEN ( s=to_unsigned(62, 8) ) ELSE
                               In1(63);

  Data_Type_Conversion_out1 <= resize("0" & Variable_Selector_out1, 8);


  Shift_Arithmetic_out1 <= resize(s(6 DOWNTO 0) & '0', 8);


  Bitwise_AND_with_Mask_out1 <=  Shift_Arithmetic_out1 AND Bitwise_AND_with_Mask_const;


  Bitwise_Operator_out1 <=  Data_Type_Conversion_out1 OR Bitwise_AND_with_Mask_out1;


  Out2 <= std_logic_vector(Bitwise_Operator_out1);

END rtl;