DS320PR810: P N (+/-) not need match on both In and Out side of Redriver?

Jimmy_Hsiao

Part Number: DS320PR810

P N (+/-) polarity of differential signal connection need match on both In and Out pin of Redriver (DS320PR810)?
Or Gen5 cpu processor will re-configure +/- polarity automatically? don't need consider differential (+/-) match? because EVM board also can work on Intel CRB +/- swap PCIe slot.

BR,

Jimmy

over 2 years ago

0 Jimmy_Hsiao over 2 years ago

Prodigy 70 points

Seems Gen4 redriver has similar question: https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1041891/ds160pr421-about-redriver-pcie-polarity-inversion

No need care about +/- connection swap, as same as Gen5 Redriver behavior?

+1 Evan Su over 2 years ago in reply to Jimmy_Hsiao

TI__Mastermind 18780 points

Hi Jimmy,

The Gen 5 redriver is the same as the Gen 4 redriver in this regard, it does not care about the exact polarity of the P/N signals and will transmit inverted P/N if it receives inverted P/N. When the PCIe differential receiver processes the inverted signals, it is responsible for recognizing the inversion and adjusting at the protocol level to compensate.

Best,

Evan Su

0 Jimmy_Hsiao over 2 years ago in reply to Evan Su

Prodigy 70 points

Understood.Thank you!

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DS320PR810: P N (+/-) not need match on both In and Out side of Redriver?