PIPE mode is available in Native PHY.
Please refer to the following document for details.
(Reference) Intel® Arria® 10 Transceiver PHY User Guide
https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/arria-10/ug_ arria10_xcvr_phy.pdf
(See PCI Express (PIPE) section)
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Category: PCI-Express
Tools: Quartus® Prime
Device: Arria® 10