Re: USB 3.1 Single Data channel vs C connector dual data channel.
☼ Best Answerby kaipyroami 2020/07/05 12:24:46
I reviewed our schematic from last year. The D+ and D- pins are to be connected together on the device. For the SS connection, just use one TX and RX set and pull the associated CC pin low with 5.1K. So if you connect TX1+/- and RX1+/-, pull CC1 low. This is what tells the host which pair is in use and it will connect the correct pair through a DPDT switch on it's end.
This was on a colleague's design. I'm not sure the SS connection was ever tested as the LAN7800 was a contingency he wanted to include for some reason.