How to enable lane reversal in Arria 10 PCIe interface

[MDavi51]

Hi all,

according to appendix B of the Arria 10 PCIe User Guide

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/ug/archives/ug-01145_avmm-1_0.pdf

it is possible to reverse the order of the PCIe lanes. This would be very useful for the routing, but I can't find how to enable it.

Have I missed the buttor, does it work automatically or does this feature not exist?

I am in the layout now and would not want to have to do the layout twice if this feature does not work properly...

Yours,

Marc.

[BoonT_Intel · Accepted solution]

Hi Sir,

Lane reversal is supported and is done automatically during link training.

Just to share more on PCIe. Even a device does not support lane reversal. The upstream device (eg. RP) will do the lane reversal when it detect the end point unable to make lane reversal.