separate.vhd

交通灯信号控制器

--
--  File: separate.vhd
--  将两位整数分解出个位和十位

library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.std_logic_unsigned.all;
use IEEE.std_logic_arith.all;

entity separate is
	port (
		clk10: in STD_LOGIC;
		NumIn: in INTEGER range 0 to 40;
		NumOutH: out INTEGER range 0 to 9;
		NumOutL: out INTEGER range 0 to 9
	);
end separate;

architecture rtl of separate is
begin	
	process(clk10)
	begin
		if rising_edge(clk10) then			
			if(NumIn>=40) then
				NumOutH<=4;
				NumOutL<=NumIn-40;
			elsif(NumIn>=30) then
				NumOutH<=3;
				NumOutL<=NumIn-30;
			elsif(NumIn>=20) then
				NumOutH<=2;
				NumOutL<=NumIn-20;
			elsif(NumIn>=10) then
				NumOutH<=1;
				NumOutL<=NumIn-10;
			else
				NumOutH<=0;
				NumOutL<=NumIn;	 
			end if;
		end if;
   end process;
end rtl;