SD 3.0 协议完整版。详细描述了3.0协议的内容以及同之前的2.0/1.0协议的区别。可以作为SD_Host_Controller开发的技术文档。-Descr iption of SD 3.0 Protocol. Not Simplify. And this file can be used into developing SD_Host_Controller Module.

本文档主要描述了SD3.0的协议的主要内容，中间加入很多关键性的思考，很有参考价值(This document mainly describes the main content of sd3.0 protocol, and adds a lot of key thinking, which is of great reference value.)