As of v18.1, the "Minimum Pulse Width" violation can be ignored.
Please wait until a future version of the Tool fixes this issue.
(Why is a minimum pulse width timing violation information message reported during the compilation of the Intel® Stratix® 10 Hard IP for PCI Express*? IP Core version 18.1?
https://community.altera.com/kb/knowledge-base/why-is-a-minimum-pulse-width-timing-violation-information-message-reported-durin/345391
--------------------
Category: PCI-Express
Tools: Quartus® Prime
Device: Stratix® 10