[SI-LIST] Issues with Midpoint Crossing of Differential IBIS Buffer

Hi,
I am having issues with a differential IBIS buffer. When I run the file in 
XTK, it works fine. When I run the file in HSPICE, the midpoint crossing 
is not correct. The transition
rate and waveshape of an individual driver are good, but the midpoint 
crossing is towards Vcc.  I checked the V-T data to see if the 
rising/falling data crossed at the
midpoint, and it does. I'm wondering if this is a problem with the I-V or 
V-T data, or both? Or is this a simulator issue? Instead of using a 
differential load resistor, I tied
the outputs to a load resistor to a reference voltage (Vos), and then the 
midpoint crossing was accurate. 
Any suggestions/comments?

Regards,
Tim


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