说明：  网络是嵌入式应用的常备功能，在NIOS II中集成了UCOS II和LWIP，分析网络设备在NIOS II中的来龙去脉对学习NIOS II设备驱动程序有典型的意义
(Network is a standing feature of embedded applications, in the NIOS II integrated UCOS II and LWIP, analysis of network equipment in the NIOS II in learning the ins and outs of NIOS II device driver has a typical significance)