Error (175001): Could not place 1 IOPLL, which is within Altera IOPLL - Error (175001): Could not place 1 IOPLL, which is within Altera IOPLL Description Due to a problem in the Quartus® II software version 14.1 and earlier, you may see this fitter error when implementing differential clock input in Arria® 10 devices. Resolution To avoid this error, manually instantiate the differential buffer using the Altera GPIO Megafunction. This problem is scheduled to be fixed in a future release of the Quartus II software. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 14.1 ['Arria® 10 GT FPGA', 'Arria® 10 GX FPGA', 'Arria® 10 SX FPGA'] ['novalue'] ['novalue'] ['novalue']