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 do

讲述了USB数据流模型、USB电气特性(缩写)、 协议层、USB设备架构、usb主机硬件软件以及集线器规范等-About the USB data flow model, USB Electrical Characteristics (abbreviation), protocol layer, USB device framework, usb hub host hardware, software and standardization

GSM软件架构,学习GSM GPRS的好资料()