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TUSB8041: SSxXP and SSxXM differential pair signal swapping

Oba
Genius 17465 points
Part Number: TUSB8041


Hello,

 

TUSB8041 datasheet says on P38 that

“11. To ease routing, the polarity of the SS differential pairs can be swapped. This means that SSTXP can be routed to SSTXM or SSRXM can be routed to SSRXP.”

 

So is this P and M differential pair signal swapping automatically done in this device?

 

Regards,

Oba

  • 0
    TI__Guru**** 179406 points

    Oba-san

    Yes, polarity inversion is part of the USB3 spec.

    During the TSEQ training sequence, the Receiver shall use the D10.2 Symbol within the TSEQ Ordered Set to determine lane polarity inversion (Rxp and Rxn are swapped). If polarity inversion has occurred, the D10.2 symbols within the TSEQ ordered set will be received as D21.5 instead of D10.2 and the receiver shall invert the polarity of the received bits.

    Thanks
    David