Internal Error: Sub-system: CDB_ATOM, File: /quartus/db/cdb_atom/cdb_atom_sys.cpp, Line: 1808 - Internal Error: Sub-system: CDB_ATOM, File: /quartus/db/cdb_atom/cdb_atom_sys.cpp, Line: 1808 Description In the Intel® Quartus® Prime® Pro Edition Software version 21.3 or earlier, you might see the internal error below when you use the output clock from the IOPLL Intel® FPGA IP to drive an F2SDRAM atom of the Intel® Arria® 10 Hard Processor System which should be driven by an LCELL in the core. Internal Error: Sub-system: CDB_ATOM, File: /quartus/db/cdb_atom/cdb_atom_sys.cpp, Line: 1808 DATAA is not supported for NIGHTFURY_IOPLL. or Internal Error: Sub-system: CDB_ATOM, File: /quartus/db/cdb_atom/cdb_atom_sys.cpp, Line: 2163 DATAA is not supported for NIGHTFURY_IOPLL. Resolution Do not use IOPLL to drive any IP or logic atoms that require a data port, because IOPLL has none of it. There is no planned fix for this problem. Custom Fields values: ['novalue'] Troubleshooting 15010799724 False ['IOPLL IP'] ['FPGA Dev Tools Quartus® Prime Software Pro'] No plan to fix 21.3 ['Arria® 10 SX FPGA'] ['novalue'] ['novalue'] ['novalue']