In the Intel® Stratix®10 L- or H-Tile design, for the preserve unused channel QSF to take effect, at least one channel in a transceiver tile needs to be instantiated in the design. You can create a dummy channel in a Tile, and apply the global or per pin assignment.
Device Family: Intel® Stratix® 10
Intel Software: Quartus Prime Pro
Last Modified: October 15, 2019
Version Found: v19.3
Bug ID: 14010227986