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TUSB9261: Connecting to VIA VL812 hub

Part Number: TUSB9261

Our customer came up with the following question: 

We use a usb3 hub chip (VIA VL812) to make extra 3 usb host and 1 usb3 connection to TUSB9261. We can't get usb3.0 connection to TUSB9261, but just USB2.0.  USB host can work on USB3.0 . I don't know why. 

When we short SSTX and SSRX instead of the capacitor marked in attaced picture, we can make USB3.0 working on TUSB9261 successfully.

Do you have experience on USB3.0 connection ?  Is this change OK for usb3.0?