Why does the Intel® Stratix® 10 L/H-Tile PCIe* Endpoint's Transaction Layer get stuck in reset when Function-Level Reset FLR is initiated?

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.