We own a Nexys Video board on which which try to hook an optical coupler (3.125G) to perform some tests using Aurora 8b/10b.
We use a 3rd party FMC adapter. I think we've been careful to correctly set Vadj (to 1.8V), to adjust the adapter's PLL to 125MHz, etc.
We even set a 1s delay between setting Vadj mux and starting the regulator (Vadj_enable).
As typical, we lost JTag (this is known, and an overlook of the FMC adapter), but that's not my point here.
The issue is we have lots of pain to get a LinkUp, and when we get it, the data integrity is not good.
The documentation is very scarce, it mentions this link as "gigabit" (why ?).
So anyone who has used the FMC connector and in particular the transceiver is very welcome to share his experience.
We also are looking for an Artix 7 board with an SFP+ connector, or a working LPC FMC SFP+ adapter but we failed to locate anything affordable/available.
Thanks in advance,