nios2实习的网络通讯，基于dm9000a芯片。在de2-70开发版上实习，内部附有所以源码，nios的源码放在software文件夹下面。-nios2 internship network communications based on dm9000a chip. Version of the de2-70 on the practical development of the internal source with it, nios software folder on the sour