说明：  该书是USB系统架构得详细解析，如果您还烦恼于寻找USB开发资料那么这本书会对您有所帮助。它对USB硬件文档进行了详细解析，可作为USB系统软件硬件得开发手册。
(USB System Architecture book is a more detailed analysis, if you have trouble in finding information on USB development then this book will help you. Its USB hardware documentation carried out a detailed analysis can be used as a USB system software and hardware development manual.)