Internal Error: Sub-system: QHD, File: /quartus/comp/qhd/qhd_check_design.cpp, Line: 369

Due to a problem in the Intel® Quartus® Prime Pro edition software version 20.1, you may see this internal error during the fitter stage.This problem only occurs in designs targeting Intel® Stratix® 10 devices and running post-route physical synthesis.

To work around this problem, perform one the following actions:

• If the internal error occurs during a normal compilation, add this .qsf (Quartus Settings File) assignment to disable post-route physical synthesis.

set_global_assignment -name POST_ROUTE_PHYSICAL_SYNTHESIS OFF

• If the internal error occurs during an ECO compile then do not perform any actions actions that require routing such as make_connection.

This problem is fixed beginning with version 20.3 of the Intel® Quartus® Prime Pro edition software.