When Function-Level Reset (FLR) capability is disabled, a Configuration Write setting the Device Control Register's parameter Initiate Function-Level Reset to 1 will cause the Intel® Stratix® 10 L/H-Tile PCIe* Endpoint's Transaction Layer to be stuck in reset.
The Intel® Stratix® 10 L/H-Tile PCIe* Endpoint will respond to subsequent requests with Unsupported Request (UR) TLP.
Conventional reset is needed to recover from this error case, e.g. PERST#, Hot Reset or Link Disable/Enable.
To work around this problem, enable FLR capability in the IP Parameter Editor.
The FLR capability has been enabled by default starting with the Intel® Quartus® Prime Pro edition software version 19.3.