PADs 封装库文件，有关USB,非常有价值，很辛苦找到的。-PADs common libraries relative USB，very usefull, and classical. may be usefull for u!

自己自制的双USB接口PCB文件，方便各位朋友研究或使用，文件使用PADS打开-Dual USB interface, made their own PCB file, all friends of convenience or use, open the file using the PADS