Internal Error: Sub-system: HDB, File: /quartus/db/hdb//hdb_asgn.cpp, Line: 1571 - Internal Error: Sub-system: HDB, File: /quartus/db/hdb//hdb_asgn.cpp, Line: 1571 Description Due to a problem in the Quartus® II software version 13.1 and later, you may see this Internal Error when compiling a design with a Quartus II Exported Partion File (. qxp ) Resolution To work around this problem, download and install patch 3.03 from the links below. You must install the Quartus II software version 13.1 Update 3 before installing this patch. Download the version 13.1 Update 3 patch 3.06 for Windows (.exe) Download the version 13.1 Update 3 patch 3.06 for Linux (.run) Download the Readme for the Quartus II software version 13.1 Update 3 patch 3.06 (.txt) 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 13.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']