CDCLVP111: Clock Buffer Behaviour When Floating Input is Selected

Tool/software:

Hi all,

I was wondering what would be the behaviour of the CDCLVP111 if a floating clock input is selected through the clk_sel pin. In my design, I need to gate or buffer the outputs of the clock buffer for sequencing and was wondering if having an idle/floating input would be okay for this functionality? 

Thanks!

- Rick