How to connect signals on ALT2GXB Megacore

Hi,

I have generated a instance of ALT2GXB Can anyboy explain where to connect this signals???

fixedclk -- --The user must provide a 125 MHz input clock signal for the fixedclk port.

rx_cruclk --Clock input from the PLD core. Connects to the clock reco

very unit (CRU).

I want to use this Megacore for using a 16 Bit PCIe PIPE within the FPGA