ID:20063 The I/O standard High Speed Differential I/O cannot be assigned to the reference clock < <name> > of IO PLL.

CAUSE: Select High Speed Differential I/O as the I/O standard only for the Intel Stratix 10 transmitter and receiver pins in the Intel Quartus Prime Pro Edition Assignment Editor or Quartus Settings File (.qsf).

ACTION: Remove the High Speed Differential I/O assignment to reference clock of IO PLL.