Need help with Nexys Video Low Pin Count FMC Connector I/Os

[Raul.Aguilar]

Was wondering if the FPGA I/Os on this connector have controlled impedance and matched trace lengths.  If matched, is it just to the complementary signal or are all signals the same trace length.  The signals will be used as single-ended instead of differential.  I have a high speed digital application that has CLK-to-signal and signal-to-signal timing constraints.  Please help.  Thank you.

[NAEastland]

 

Hey Raul,

The I/O trace lengths for the FMC connector are matched. I believe all the traces, not just the pairs, are matched to within a tolerance of 5mm. I hope this helps and let us know if you need any more information for your project.

- Nate

[Raul.Aguilar]

I'd also like to verify that the traces are 50 ohm line impedance single-ended.  Please let me know.  Thanks again for the help.

[NAEastland]

I believe they are 60 ohm single-ended, but I can see about snagging one of our engineers soon to verify that.

[Raul.Aguilar]

That'd be great.  really hoping they are 50 ohm single-ended line impedance.

[NAEastland]

Hey Raul,

Sorry for the delay, but I am still waiting on engineering to verify the impedance for the FMC connector traces. We will get back to you with that information as soon as possible.

- Nate

[NAEastland]

Hey Raul, 

If you have not been able to determine this yourself yet, I have gotten it confirmed that the traces in question are 60 ohm instead of 50 ohm. Sorry for the delay.

-Nate