Problem with transceivers in Arria 10 SoC Devkit

Hello,

I have a system in which I am using 2 Arria 10 SoC Devkits. One is used as a transmitter and the other as the receiver. In this setup I am using a transceiver port to send data at 10 Gbps.

Since a while ago, I have noticed that the data is getting corrupted and unstable. At the beginning I assumed that the problem was the current development on the communication chain but recently I managed to see one of the signals in an oscilloscope and I cound find it having a problem in which the phase of the transmitted signal is changing as the following figure shows.

Since at that time I was using the SFP module cases, I assumed that the problem was within the SFP+. Later started usign some SMA ports both the ones already in the board and some connected through an FMC port and again I am facing problems with the data transmission that even cause the system not to achieve synchronization. This synchronization is a stable design that has worked flawlessly before with these boards and other designs.

Since the beginning, I have been using the option:

set_global_assignment -name PRESERVE_UNUSED_XCVR_CHANNEL ON

to ensure that the unused transceivers are properly preserved in case I wanted to use them later.

Have anyone faced a similar issue or has an idea of what might be happening?

Thank you for your support,

Jorge