说明：  怎样开始fpga设计，文中是我看了一本书的笔记，用思维导图软件记录的，感觉这种方法不错，希望有更多的人采用，增加学习效率。
(How to start fpga design, the paper is a book I read the notes, use mind mapping software, records, and feel good this way, I hope more people use, to increase learning efficiency.)