In Quartus® software version 16.1 and earlier, the default I/O standard setting for the alert_n signal is SSTL-12. It is recommended to change the setting to 1.2V.
Device Family: Intel® Arria® 10, Intel® Stratix® 10
Last Modified: August 14, 2017
Version Found: v16.0
Bug ID: FB: 400506;
The default I/O standard setting for the alert_n signal is set to 1.2 V starting in Quartus software version 17.0.