The Theory And Realization Of Ethernet Over USB

Therefore, data synchronization ability is very important in embedded system. With the wide applications of USB,USB has been supported more and more in embedded Linux.With the popularization , USB interface can be simulated a ethernet interface to realize network connection and synchronization in application layer. And the involved theory is Ethernet Over USB.In the early of 2002, Intel announced the new CPUs based on XScale? technology. The Intel? XScale core is an ARM V5TE compliant microprocessor. It has been designed for high performance and low-power. It incorporates an extensive list of architecture features that allows it to achieve high performance. This rich feature set allows programmers to select the appropriate features that obtain the best performance for their application. There is USB Device Control in PXA255 through which we can connet the HPC and PC with USB data line to synchronize data.The aim of the research is to realize the data synchronization based on Ethernet Over USB which based on the INTEL XScale PXA255 hardware platform and Linux kernel 2.4.18 operation system.Because in application layer the synchronization tool use ftp protocol to transmit data,and the TCP/IP protocol has been supported well in Linux kernel .In this research what we have to do is to realize the bottom layers—the physical layer and the data link layer.The paper detailedly analyzes the USB1.1 protocol,Ethernet protocol, hardware circuit, transmission of data , resolution for hotplug and the configuration over host PC,and brings forward the problems of the current design and then gives each one a resolvent.All the work described in the paper have been finished now. Through simple test, the USB driver has succeeded in running stably on the development platform. The system should be a high-reliable data synchronization by keeping optimizing.