Crossing Level Definition

Active IN1 Edge	Active IN2 Edge	Crossing Level
Falling	Don't care	It is the voltage level at which the falling edge of input1 intersects with the rising edge of input2 waveform.
Rising	- do -	It is the voltage level at which the rising edge of input1 intersects with the falling edge of input2 waveform.
Both	- do -	It is the voltage level at which both input1 and input2 waveforms cross each other at both rising edges & falling edges.

Significance of statistics:
Mean	Important. This value gives the mean crossing level of the two waveforms. For a differential pair, this value should be close to the mid level of the two waveforms.
Min	This is the minimum crossing level of the two waveforms.
Max	This is the maximum crossing level of the two waveforms.
Peak cy-cy	Very important for differential pairs. This should be as small as possible since it will directly translate in to cycle-to-cycle period jitter.
Peak-to-peak	Important for differential pairs. This should also be as small as possible as it will translate in to short and long term jitter.