Due to a known problem in the Intel® Quartus® Prime Pro Edition software version 19.4 and earlier, the Intel® Stratix® 10 device Active Serial configuration clock (AS_CLK) will run at 100 MHz during configuration even when you set AS_CLK to operate at 80 MHz.
Device Family: Intel® Stratix® 10
Intel Software: Quartus Prime Pro
Last Modified: March 19, 2020
Version Found: v19.3
Version Fixed: v20.2
Bug ID: 1506961575