交通灯作业
交通灯状态机
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
ENTITY jiaotongdeng IS
PORT ( clk, subway: IN STD_LOGIC; --subway 按键代表次干道有无车等待，clk 为 1Hz
LIGHT1, LIGHT2, NUM1, NUM2: OUT INTEGER RANGE 0 TO 9 ); --数码管依次显示主干
道灯，次干道灯，十位数，个位数
END jiaotongdeng;
ARCHITECTURE example OF jiaotongdeng IS
TYPE STATES IS (S1,S2,S3,S4) ; --四种状态：
SIGNAL STATE: STATES := S1;
SIGNAL COUNT : INTEGER RANGE 0 TO 45 := 0;
BEGIN
PROCESS (subway, clk)
BEGIN
IF(clk'EVENT AND clk='1')THEN
CASE STATE IS
WHEN S1 =>
IF (subway = '0' and COUNT =0) THEN
STATE <= S2;
COUNT <= 5;
LIGHT1 <= 2;
LIGHT2 <= 4;
ELSE
IF (COUNT = 0) THEN
COUNT <= 45;
ELSE
COUNT <= COUNT-1;
END IF;
LIGHT1 <= 1;
LIGHT2 <= 4;
END IF;
WHEN S2 =>
IF (COUNT = 0) THEN
STATE <= S3;
COUNT <= 25;
LIGHT1 <= 4;
LIGHT2 <= 1;
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