该文档是DM9000编程指导手册，它跟数据手册不一样，他是指导一个初学者如何使用DM9000，并给出C语言实例。-The document is a guide DM9000 Programming Manual, it is not the same with the data sheet, he is a guide for beginners how to use the DM9000, and gives examples of the C language.