4DSP has reference designs for this card on most systems. You can ask them for it if it exists for your devkit.
If not, you can easily declare the output ports of the DDS compiler as external and assign those pins to the pins of the FMC card in your pin constraints. If the connectivity you are interested is differential I believe you can instantiate differential IO in block diagram and make the output of those IOs external and connect them to the pins in the xdc file.
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