Error: LVDS SDC cannot find IOPLL. Ensure IOPLL SDC is listed before LVDS SDC in qsf - Error: LVDS SDC cannot find IOPLL. Ensure IOPLL SDC is listed before LVDS SDC in qsf Description Due to a problem in the Intel® Quartus® Prime Pro Edition software version 19.1, you may see this error message in projects that include the LVDS SERDES Intel® FPGA IP configured in External PLL Mode. The error may be seen even if the Quartus® Prime IP File (.qip) of the IOPLL Intel® FPGA IP is listed before the '.qip' file of the LVDS SERDES Intel® FPGA IP in the project Quartus® Prime Settings File (.qsf). Resolution A patch is available to fix this problem for the Intel® Quartus® Prime Edition Pro software version 19.1 Download and install Patch 0.19 for the Intel® Quartus® Prime Edition Pro software version 19.1 from the appropriate link below (To download .run file, right-click on the above link and choose “Save link as”) Intel® Quartus® Prime Edition Pro software version 19.1 patch Download patch 0.19 for Windows (.exe) Download patch 0.19 for Linux (.run) Download the Readme for patch 0.19 (.txt) This problem is fixed starting with in the Intel® Quartus® Prime Pro Edition software version 19.2. Custom Fields values: ['novalue'] Troubleshooting 2007805098 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 19.2 19.1 ['Stratix® 10 FPGAs and SoCs'] ['novalue'] ['novalue'] ['novalue']