利用Spartan-3 Starter Board实验板上的旋转开关，设计一个通过旋转开关的方向来控制LED灯的依次点亮顺序的实验，并且要求可以循环点亮。-Using Spartan-3 Starter Board experiment on-board rotary switch, the design of a direction through the rotary switch to control the LED lights light up sequence followed by