你好，
如果你不打算使用这两个引脚，你可以让它们浮动。但是，如果你这样做，FX3只是一种枚举方法（UB3.0）。
如果任何条件导致无法枚举USB3.0，则无法在USB2.0中工作。
以上来自于百度翻译
以下为原文
Hi,
You could leave these two pins floating if you don't plan to use them. However, if you do that, FX3 will just one way to enumerate(USB3.0).
If any condition which leads to the failure to enumerate as USB3.0, it could not work at USB2.0.
你好，
如果你不打算使用这两个引脚，你可以让它们浮动。但是，如果你这样做，FX3只是一种枚举方法（UB3.0）。
如果任何条件导致无法枚举USB3.0，则无法在USB2.0中工作。
以上来自于百度翻译
以下为原文
Hi,
You could leave these two pins floating if you don't plan to use them. However, if you do that, FX3 will just one way to enumerate(USB3.0).
If any condition which leads to the failure to enumerate as USB3.0, it could not work at USB2.0.
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