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USB Host.──Hardware and Software

CHEN Qi mei 1,2 ,WU Yong hui 1,DING Chuan suo 2,CHEN Suo zhu 3 (1.Department of Computer Science & Technology,Nanjing University,Nanjing 210093,China; 2.Nanjing University Communication Technology Institute,Nanjing 210093,China; 3.Nanjing J  
USB interconnection supports data traffic between host and USB device.The host interfaces are described here,which facilitate the communication between software clients on host and function implementations on device.The three layers of a host are USB bus interface,USB system and client.The USB system has three basic components:Host Controller Driver,USB driver and host software.The interface between HCD and USBD is Host Controller Driver Interface(HCDI).USBD provides host interface(USBDI)to USB devices for clients,through which clients bring forward requests for data transmission and device configuration.The host system may provide different host software implementation to realize same host behavior.
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