说明：  该程序为用vhdl语言编写的彩灯控制程序！ 通过状态机实现三个彩灯的状态装换，红灯亮2秒，绿灯亮3秒，黄灯亮1秒！ 时钟频率为1HZ！ 通过该程序也可以改成交通灯的情况
(The procedure for the use of VHDL language Lantern control procedures! Through the state machine to achieve the status of three lantern-for-loaded, two seconds the red light, green light is 3 seconds, 1 seconds yellow light! Clock frequency of 1HZ! Through the program can also change the situation of traffic lights)