Reference Clock/InClock for the LVDS SERDES I/OPLL in the Arria 10 on Quartus 18.1

Hello, I am working on Quartus Pro 18.1 with an Arria 10. In the design I need to use, as a tranceiver, a LVDS SERDES IP for 18 channels in the Bank 3A. The problem I have is in regard of the Refe...