Internal Error: Sub-system: BSYN, File: /quartus/fitter/bsyn/retime/bsyn_rtm_flop.cpp, Line: 289

Description

Due to a problem in the Intel® Quartus® Prime Pro Edition Software version 21.4 and earlier, you might see this internal error during the Finalize stage of fitting. This problem only affects Intel Agilex® 7 devices.

Resolution

To work around this problem, disable post route physical synthesis optimizations by adding the following assignment to your Intel® Quartus® Settings File (.qsf):

set_global_assignment -name POST_ROUTE_PHYSICAL_SYNTHESIS OFF

This problem is scheduled to be fixed in a future release of the Intel® Quartus® Prime Pro Edition Software.