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host模式下，要用DRVVBUS来控制，请参考下面的schematic checklist.
Typical connections for a USB host:
• USBx_DP and USBx_DM are connected directly to the USB connector
• USBx_CE is typically not used and can be left unconnected
• USDx_ID should be grounded
• USBx_DRVVBUS should be connected to the enable of the 5 V VBUS power source.
• USBx_VBUS should be connected to the output of the 5 V VBUS power source www.ti.com/.../sprabn2.pdf
