通过Quartus II、SOPC Builder、Nios II IDE三种工 具的配合使用 用软件控制led，VHDL程序通过描述硬件电路控制led的依次亮灭(Through the Quartus II, SOPC Builder, Nios II IDE three workers With the use Use software to control led, VHDL program by describing the hardware circuit control l