Besides, parallel processing framework is used to support multiple remote USB system clients and each client can support a maximum of 127 USB devices.
另外由于采用了并行处理框架，使本系统可支持多个远程usb系统客户端，而且每个客户端均可支持最多127个USB设备。
USB Function device driver is designed by client, it lies the up layer of USB Bus device driver, it sends and receives information from USB device by send URB to USB Bus device driver.
USB功能驱动程序由设备开发者编写，位于USB总线驱动程序的上层，通过向USB总线驱动程序发送USB请求包，来实现对USB设备信息的发送或接收。
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