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I think you mean FTDI not FDDI for the USB 3 FIFO.
Check out FTDI's website and possb;ly contact them for assistance.
There are free PC drivers for their USB chips which are reasonably documented.
The interface between the FTDI chip and the FPGA should not be too hard except for the difficulty of prototype wiring at USB super-speed between the carrier card and the FTDI board.
There is an FTD app note that might help:
and there may be some info here: