fenwei.vhd

基于VHDL实现的十字路口交通灯功能

library ieee;
use ieee.std_logic_1164.all;

entity fenwei is
port
(innum:in integer range 0 to 25;
 shiwei,gewei:out integer range 0 to 9);
end;

architecture b_fenwei of fenwei is
begin
 process(innum)
  begin
if innum>=20 then
shiwei<=2;
gewei<=innum-20;
elsif
 innum>=10 then
 shiwei<=1;
 gewei<=innum-10;
else
  shiwei<=0;
  gewei<=innum;
end if;
end process;
end;