Occasional Contributor
Regular ContributorHi,
As I understand it, you observe that the PMA value that you obtain from the autosweep seems still get into intermittent bit error.
In this case, you would need to perform further fine tuning to select the optimal value. After your autosweep, you can try to export the autosweep report which should show the BER for all the combination tested. From there, you can try to find the passing range for each of the PMA parameters and then select the middle value for each parameters to ensure you have sufficient margin for PVT variation. You may refer to the "AN871 - Quick Guide for Intel Arria 10 and Intel Cyclone 10 GX Transceiver High-Speed Link Tuning" for further details on finding the optimal range.
https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/an/an871.pdf
Regarding the VOD values, it is recommended for you to keep within the recommended range of the user guide.
Please let me know if there is any concern. Thank you.
Best regards,
Chee Pin
