Internal Error: Sub-system: VPR20KMAIN, File: /quartus/fitter/vpr20k/altera_arch_common/altera_arch_net_rr_terminals.c, Line: 2470

Description

Due to a problem in the Intel® Quartus® Prime Pro Edition software version 17.1 Update 1, you may see this Internal Error in a fitter stage.

Resolution

This problem is fixed beginning with the Intel® Quartus® Prime Pro Edition software version 18.1