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TUSB9261: swap SUPERSPEED diff pair polarity

dan gill1

Prodigy 140 points

Part Number: TUSB9261

Tool/software:

I have had to swap the + and - on the super speed TX and RX signals to route cleanly, but I don't see where in the F/W I need to set to tell the chip that they are swapped.

Can you point that out?

Thanks,dan

over 1 year ago

0 Nicholaus_Malone over 1 year ago

TI__Mastermind 27925 points

Hi Dan,

There is not a firmware that corrects a swap by the USB SuperSpeed Tx polarity. There is only firmware that corrects for the SATA Rx/Tx polarity swap.

It should be OK to swap the USB SuperSpeed polarity without special firmware.

Regards,

Nicholaus

0 dan gill1 over 1 year ago in reply to Nicholaus_Malone

Prodigy 140 points

So the controller should be able to automatically detect the polarity swap of the super speed pins?

0 Nicholaus_Malone over 1 year ago in reply to dan gill1

TI__Mastermind 27925 points

Yes, Automatic Lane Polarity Inversion is included as a part of the USB 3.0 specification.

Regards,

Nicholaus

+1 Nicholaus_Malone over 1 year ago in reply to Nicholaus_Malone

TI__Mastermind 27925 points

It also is mentioned in the datasheet section 10.1.2: https://www.ti.com/lit/ds/symlink/tusb9261.pd

Regards,

Nicholaus