Error(20561): IOPLL <name> could not be placed in location <location> because this location cannot be used by IOPLLs using Normal or Source Synchronous Compensation

Description

You may see this error in the Quartus® Prime Pro Edition Software v21.3 and earlier when using IOPLLs in Banks 3C and 3D in Agilex™ 7 F-Series SoC FPGA devices.

The error occurs because the HPS Shared GPIO Banks (3C & 3D) do not support IOPLLs in Normal and Source Synchronous compensation modes.

Resolution

If the IOPLL needs to operate in Normal or Source Synchronous modes, select a location that is not adjacent to the HPS Bank. Alternatively, choose another IOPLL compensation mode.