Error:Error in CNX file format. Can't create the custom megafunction variation file(s) - Error:Error in CNX file format. Can't create the custom megafunction variation file(s) Description Due to a problem in the 32-bit Quartus® II software version 11.0 and later for Linux, you may see this error message when opening following megafunctions in the MegaWizard™ Plug-In Manager: ALTDDIO_IN ALTDDIO_OUT ALTDDIO_BIDIR ALTDLL ALTLVDS_RX ALTLVDS_TX ALTDQ ALTSHIFT_REG Resolution There are no plans to fix this issue. To work around this problem, use the 64-bit Quartus II software for Linux if available or the Quartus II software for Windows. Related Articles Why can't I edit or upgrade my ALTDDIO megafunctions? Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 11.0 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']