bcd_add_sub_4dig.vhd

將正在順時針或逆時針旋轉的步進馬達目前角度顯示在ＬＣＭ上。

--*************************************
--*  4 Digital BCD Adder,Substractor  *	
--*  Filename : BCD_ADD_SUB_4DIG.VHD  *
--*************************************

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
use work.STEP_MOTOR_DEGREE_FORWARD_REVERSE_LCD_PACK.all;

entity BCD_ADD_SUB_4DIG is
    Port ( MODE  : in std_logic;
           X     : in std_logic_vector(15 downto 0);
           Y     : in std_logic_vector(15 downto 0);
           SUM   : out std_logic_vector(15 downto 0));
end BCD_ADD_SUB_4DIG;

architecture Behavioral of BCD_ADD_SUB_4DIG is
  signal CT : std_logic_vector(4 downto 1);
begin

ADD_SUB1 : BCD_ADD_SUB_1DIG port map (MODE ,MODE,X(3 downto 0)  ,Y(3 downto 0)  ,SUM(3 downto 0)  ,CT(1));
ADD_SUB2 : BCD_ADD_SUB_1DIG port map (CT(1),MODE,X(7 downto 4)  ,Y(7 downto 4)  ,SUM(7 downto 4)  ,CT(2));
ADD_SUB3 : BCD_ADD_SUB_1DIG port map (CT(2),MODE,X(11 downto 8) ,Y(11 downto 8) ,SUM(11 downto 8) ,CT(3));
ADD_SUB4 : BCD_ADD_SUB_1DIG port map (CT(3),MODE,X(15 downto 12),Y(15 downto 12),SUM(15 downto 12),CT(4));

end Behavioral;