Error (21075): The junction temperature range value of '[-40 C, 100 C]' is illegal for the currently selected part. - Error (21075): The junction temperature range value of '[-40 C, 100 C]' is illegal for the currently selected part. Description In the Quartus® II software version 13.1, you may see this fitter error if you compile a design targetting a Max® V device in the industrial temperature range that was created in an earlier version of the Quartus II software. The Quartus II software version 13.0 SP1 and earlier, supported the industrial temperature range for Max V devices. Beginning with the Quartus II software version 13.1, MAX V devices only support the extended temperature range. Resolution To avoid this error, change the following setting in the Quartus Setting File ( .qsf ) before compiling in later version of the Quartus II software. From: set_global_assignment -name MAX_CORE_JUNCTION_TEMP 100 To: set_global_assignment -name MAX_CORE_JUNCTION_TEMP 125 Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 13.1 ['MAX® V CPLDs'] ['novalue'] ['novalue'] ['novalue']