Can the transceiver block reference clock pins be AC or DC coupled?
Clock/PLL
No, it will only support AC coupling.
Check the "Transceiver Clocking **" chapter of each device handbook with a keyword search for "electrical specifications" for more information.
Also, regarding "LVPECL DC-Coupling Termination" described in each device handbook, it is a method of handling I/O pins that are not transceiver block pins, and supports both AC and DC coupling.
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