介绍host控制器协议，ehci和ohci-The introduced host controller Agreement, ehci and ohci

对usb技术的详细总结，这个章节是usb的基础知识，后续为usb host控制器协议、linux下usb架构以及linux的gadget结构。-Usb technology detailed summary of this chapter is to the usb basics, and follow-up usb host controller agreements, linux under usb gadget structure of the architecture and Linux

English datasheet. MVSILICON AU7843 USB HOST MP3 WMA DECODER SOC 2008-7-7 V1.0 LQFP64 highly integrated SOC for MP3/WMA player, AU7843 integrates MCU, MP3/WMA decoder, USB Host controller, SD/MMC card controller, a 16-bit audio decoder and an