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CDCUN1208LP: Unused Input

Part Number: CDCUN1208LP

I am using the CDCUN1208LP in host mode, with LVDS input type, and VDD connected to 1.8V. I see that datasheet figure 25 shows unused inputs as floating, but I cannot find any information about pull-down resistors, fail-safe inputs, etc.

How should I connect the unused IN2 input?