最近在学习USB 2.0体系，请问，我们常见到的USB转串口驱动属于HCD还是USBD？
以下为摘录：
• Host Controller Driver (HCD): The software interface between the USB Host Controller and USB
System Software. This interface allows a range of Host Controller implementations without requiring
all host software to be dependent on any particular implementation. One USB Driver can support
different Host Controllers without requiring specific knowledge of a Host Controller implementation.
A Host Controller implementer provides an HCD implementation that supports the Host Controller.
• USB Driver (USBD): The interface between the USB System Software and the client software. This
interface provides clients with convenient functions for manipulating USB devices.
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