Internal Error: Sub-system: HSSI, File: /quartus/periph/hssi/hssi_module_av.cpp, Line: 6805 - Internal Error: Sub-system: HSSI, File: /quartus/periph/hssi/hssi_module_av.cpp, Line: 6805 Description Due to a problem in the Quartus® II software version 13.1 and earlier, you may see this internal error if your design targets an Arria® V ES or Cyclone® V ES device and have Configuration via Protocol ( CvP ) enabled. Resolution To work around this problem, either target a non-ES device or disable the option for CvP . 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']