Error: Internal Error: Sub-system: SIN, File: /quartus/tsm/sin/sin_micro_tnodes_utility.cpp, Line: 431 - Unknown I/O cell name: 'dibss' - Error: Internal Error: Sub-system: SIN, File: /quartus/tsm/sin/sin_micro_tnodes_utility.cpp, Line: 431 - Unknown I/O cell name: 'dibss' Description Due to a problem in the Intel® Quartus® Prime Pro Edition software version 20.3, you may see this error due to unrecognised and unbypassed new pins added in Direct Interface Bus (DIB) IP Intel® pins for IO timing during compilation in Intel® Stratix®10 devices. Resolution A patch is available to workaround this problem for the Intel® Quartus® Prime Pro Edition software version 20.3. Download and install Patch 0.46pro from the appropriate link below. Download patch Intel® Quartus® Prime Pro Edition 20.3 Patch 0.46pro for Windows (.exe) Download patch Intel® Quartus® Prime Pro Edition 20.3 Patch 0.46pro for Linux (.run) Download the Readme for Intel® Quartus® Prime Pro Edition 20.3 Patch 0.46pro (.txt) This problem is fixed beginning with the Intel® Quartus® Prime Pro Edition software version 21.1 Custom Fields values: ['novalue'] Troubleshooting 1508628925 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 21.1 20.3 ['Stratix® 10 FPGAs and SoCs'] ['novalue'] ['novalue'] ['novalue']