Description
Due to a problem in the Intel® Quartus® Prime Pro Edition software version 20.3 and earlier, you may see the internal error above at Fitter stage when there is a PLL connected to multiple LVDS IPs with outclk channel in the same IO bank. This problem only affects Intel® Arria® 10 devices.
Resolution
This problem is fixed beginning with the Intel® Quartus® Prime Pro Edition software version 21.1.