Do fPLL must be calibration with USRCLK even though used as a core PLL

Hi ,

How to use fPLL with core mode for Arria10? We don't need transceiver in our design, just need fPLL for fractional clock output. but USRCLK used as a general purpose IO is not feeded by a free running clock in our board design.

Do fPLL must be calibration with USRCLK even though used as a core mode PLL?

From documents ug-01149, "Timing analysis is not supported for the Arria 10 fPLL used as a core PLL." Is it really?

Thank you!