通用串行总线（usb）协议，包含中文usb1.1,英文usb2.0，英文usb3.0三个版本。对软硬件设计都很重要-Universal Serial Bus (usb) protocol， contains usb1.1 by Chinese,usb2.0 and usb3.0 by English three versions.For software and hardware engineers are very important