www.pudn.com > DesignOfCarLight.rar > car_control.vhd

LIBRARY IEEE; 
USE IEEE.STD_LOGIC_1164.ALL; 
USE IEEE.STD_LOGIC_ARITH.ALL; 
 
ENTITY car_control IS 
  PORT( 
        turn_fro_big_light  : IN std_logic; 
        turn_left           : IN std_logic; 
        turn_right          : IN std_logic; 
        bake                : IN std_logic; 
        fro_big_light_con   : OUT std_logic;         
        fro_L_light_con     : OUT std_logic; 
        fro_R_light_con     : OUT std_logic; 
        back_L_lights_con   : OUT std_logic_vector( 2 downto 0); 
        back_R_lights_con   : OUT std_logic_vector( 2 downto 0)         
      ); 
END car_control; 
 
ARCHITECTURE arch_car_control of car_control IS 
BEGIN 
  process( turn_left, turn_right, bake, turn_fro_big_light) 
   BEGIN    
    if( turn_fro_big_light = '1' ) then  
      fro_big_light_con <= '1'; 
    else 
      fro_big_light_con <= '0'; 
    end if; 
 
    --when nothing to do 
    if( turn_left = '0' and turn_right = '0' and bake = '0') then 
      fro_L_light_con <= '0'; 
      fro_R_light_con <= '0'; 
      back_L_lights_con <= "000"; 
      back_R_lights_con <= "000";  
     
    --when Only bake 
    elsif( turn_left = '0' and turn_right = '0' and bake = '1') then 
      fro_L_light_con <= '0'; 
      fro_R_light_con <= '0'; 
      back_L_lights_con <= "010"; 
      back_R_lights_con <= "010"; 
     
    --when Only turn_right  
    elsif( turn_left = '0' and turn_right = '1' and bake = '0')then 
      fro_L_light_con <= '0'; 
      fro_R_light_con <= '1'; 
      back_L_lights_con <= "000"; 
      back_R_lights_con <= "001"; 
 
    --when turn_right and bake; 
    elsif( turn_left = '0' and turn_right = '1' and bake = '1')then 
      fro_L_light_con <= '0'; 
      fro_R_light_con <= '1'; 
      back_L_lights_con <= "100"; 
      back_R_lights_con <= "001"; 
   
    --when Only turn left; 
    elsif( turn_left = '1' and turn_right = '0' and bake = '0')then 
      fro_L_light_con <= '1'; 
      fro_R_light_con <= '0'; 
      back_L_lights_con <= "001"; 
      back_R_lights_con <= "000"; 
 
    --when turn left and bake 
    elsif( turn_left = '1' and turn_right = '0' and bake = '1')then 
 
      fro_L_light_con <= '1'; 
      fro_R_light_con <= '0'; 
      back_L_lights_con <= "001"; 
      back_R_lights_con <= "100"; 
 
    elsif( turn_left = '1' and turn_right = '1' and bake = '0')then 
      fro_L_light_con <= '0'; 
      fro_R_light_con <= '0'; 
      back_L_lights_con <= "000"; 
      back_R_lights_con <= "000"; 
 
    elsif( turn_left = '1' and turn_right = '1' and bake = '1')then 
      fro_L_light_con <= '0'; 
      fro_R_light_con <= '0'; 
      back_L_lights_con <= "000"; 
      back_R_lights_con <= "000"; 
    end if; 
   
  END process; 
END arch_car_control;