There is no default clock frequency for it. It depends on where it is connected. Open up the project in Vivado, look at the block diagram and trace the clock input to figure out what the source is. That source is probably going to be coming from the PS7 block FCLK_CLK0 or something like that. Next step is to find out the frequency set for that signal. So the first step is where the clock is coming from and then figuring out the frequency of that source.
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