The USB host controller is connected to a USB device comprising one or more end points, and comprises a buffer.
USB主机控制器连接到包括一个或多个端点的USB设备，并且包括缓冲器。
As USB's popularization, there are more and more micro-processors have USB host-side and device-side controller, such as AT91RM9200.
随着USB总线的普及，具有US B主机端和从机端控制器的微型处理器越来越多，AT 91rm 9200就是这种微型处理器之一。
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