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USB是一种用于连接计算机和外部设备的外部总线体系结构 ,OHCI是基于OHC硬件类型的USB系统的软硬件接口。为了支持USB系统软件的研发 ,文章详尽分析了OHCI层实现数据传输的关键数据结构ED和TD ,给出了USB系统主机端硬件HC和底层系统软件HCD借助两种通信通道完成ED列表和TD队列的处理过程 ,分析了四种类型的USB数据传输在OHCI层的实现策略
USB is an external bus architecture for connecting computers and external devices. OHCI is a hardware and software interface for USB systems based on OHC hardware types. In order to support the research and development of USB system software, the article analyzes the key data structure ED and TD of OHCI layer for data transmission in detail, and gives the hardware system HC of the USB system and the underlying system software HCD to complete the ED list and the TD queue by means of two communication channels Of the process, analysis of the four types of USB data transmission in OHCI layer strategy