USB 官方协议文档，包含 | USB 3.1 Appendix E Rev1.0.pdf | USB 3.1 Specification Welcome Message - Oct 2014.pdf | USB 3_0 Adopters Agreement Final_020411.pdf | USB_3_1_r1.0.pdf | USB_OTG_and_EH_3-0_release_1_1_10May2012.pdf | +---SuperSpeed I