Due to a problem with the Intel® Quartus® Prime Pro edition version 19.1, the synchronizer chain "altera_std_synchronizer_nocut" might have an unsafe Mean Time between Failure (MTBF) when it follows an asynchronous transfer. This is because the synchronizer chain is merged with retimer-created registers, which breaks the synchronizer requirements. Without a synchronizer, an asynchronous transfer will have a very low MTBF and be reported as being unsafe.
Device Family: Intel® Stratix® 10
Intel Software: Quartus Prime Pro
Last Modified: May 17, 2019
Version Found: v19.1
Bug ID: 1409335092