M.2 PCIE AC coupling on Tx Line

Hello, I am designing a carrier board for Jetson AGX Orin. I am planning to put an M.2 connector that will connect to an NVME. When I refer to the Design Guide, it is suggested that AC capacitors are not required on carrier board if connected to a PCIE or M.2 connector.

However, in a reference schematic P3737, I noticed that they included the capacitors inline with the TX lines still.

Should I include the AC capacitors for my application then?

On the TX lines: absolutely yes.
On the RX lines: not for a slot (M.2, standard PCIe). They are on the slot card then.
RefClk: Never.


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