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TUSB1064: Polarity Inversion

Daniels Kurgs
Prodigy 180 points
Part Number: TUSB1064

Hello TI Team,

I know that the USB 3.2 spec supports polarity inversion. This means that the p and n signals of the USB 3.1 lanes are allowed to be swapped.

However, it seems that the DisplayPort standard does not allow the swapping of N and P pins in the main link.

My question is this - as a DP Sink:

can we then still invert the polarity of the upstream facing TX1,2 and RX1,2 lanes and be sure that correct ML polarities are outgoing? (Like in 4Lane DP mode)

can we still invert both upstream facing and downstream facing USB 3,1 lanes and be sure that a USB 3.1 PHY compliant device will receive correct data? (Like in 2DP+2USB or 2USB lane mode)

Thanks a lot!

Kind regards,

Daniels
EDIT: Fixed typo from Source to Sink

  • 0
    TI__Guru 64326 points

    Hi Daniels,

    For DP Alternate mode applications TX1/2 and RX1/2 polarity should not be swapped at the Type-C connector, I recommend not swapping even in USB+DP modes. However TUSB1064 SSTX and SSRX polarity can be swapped. USB 3.1 Phys support polarity swap and will resolve polarity during the link's initial handshake.