Not really needed. However, you might need to notice the I/O pin placement rules to avoid creating jitter to LVDS
A few drivers may require an arrangement 25 resistor. On the off chance that the SSTL/HSTL input is being driven by another Si533x gadget, the 25 arrangement resistor isn't required as this is coordinated on-chip. The most extreme suggested input recurrence right now 350 MHz.
it just comes from SPEC saying that Rx need 100 ohm termination. I know that's refer to rx data. So I wonder if rx clock have any restriction.
If it is LVDS, it doesnt matter whether you are using it as clock or digital pin. You will need to put RX 100 Ohm Termination as long as you are using LVDS.