Due to a problem in the Intel® Quartus® Prime Pro Edition software version 19.1, you may see this error during the synthesis stage of compilation.
Device Family: Intel® Stratix® 10
Intel Software: Quartus Prime Pro
Type: Answers
Area: Tools
Last Modified: November 12, 2019
Version Found: v19.1
Bug ID: 1507506876
Internal Error: Sub-system: HDD, File: /quartus/h/hdb_if_json_sys.h, Line: 226
Description
Workaround/Fix
To work around the problem, remove instance assignments which have "auto_fab_0|*" as in the target (-to) field from the QSF (and other scripts sourced by the QSF) file.
This problem is scheduled to be fixed in a future release of the Intel® Quartus® Prime Pro Edition software.