Warning 12283: Assignment INPUT_TERMINATION on transceiver refclk clk buf/pin pcie_ref_clk is not supported - Warning 12283: Assignment INPUT_TERMINATION on transceiver refclk clk buf/pin pcie_ref_clk is not supported Description You get this warning in the Quartus® II software if you implement the assignment specified in the Transceiver Clocking in Stratix® V Devices chapter in volume 2 of the Stratix® V Device Handbook. The incorrect setting is: set_instance_assignment -name INPUT_TERMINATION OFF -to <refclk_pin_name> Resolution The new recommendation is: set_instance_assignment -name XCVR_REFCLK_PIN_TERMINATION DC_COUPLING_EXTERNAL_RESISTOR -to <refclk pin name> This problem is fixed in the latest Stratix® V Device Handbook. Related Articles Warning (12283): Assignment INPUT_TERMINATION on transceiver refclk clk buf/pin is not supported Custom Fields values: ['novalue'] Troubleshooting 2205755379 False ['PCI Express'] ['FPGA Dev Tools Quartus II Software'] No plan to fix 10.1 ['Stratix® V E FPGA', 'Stratix® V FPGAs', 'Stratix® V GS FPGA', 'Stratix® V GT FPGA', 'Stratix® V GX FPGA'] ['novalue'] ['novalue'] ['novalue']