fenwei.vhd

这是交通灯控制器的设计系统,里面有文字说明以及详细的图形,希望大家喜欢

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;

entity fenwei is
port
(numin:in integer range 0 to 99;--输入数值
 numa,numb:out integer range 0 to 9;--数值高位，低位
 rst:in std_logic);
end;
architecture fen of fenwei is
begin
process(numin)
begin
if rst='1' then numa<=0;
                numb<=0;
elsif numin>=90 then
  numa<=9;--高位获得值
  numb<=numin-90;--低位获得值
  elsif numin>=80 then
    numa<=8;
    numb<=numin-80;
  elsif numin>=70 then
    numa<=7;
    numb<=numin-70;
  elsif numin>=60 then
    numa<=6;
    numb<=numin-60;
  elsif numin>=50 then
    numa<=5;
    numb<=numin-50;
  elsif numin>=40 then
    numa<=4;
    numb<=numin-40;
  elsif numin>=30 then
    numa<=3;
    numb<=numin-30;
  elsif numin>=20 then
    numa<=2;
    numb<=numin-20;
  elsif numin>=10 then
    numa<=1;
    numb<=numin-10;
else
numa<=0;
numb<=numin;
end if;
end process;
end;