TXB0106: question for IBIS model

Hi Mukuno-san,

From the IBIS model file of the TXB0106:

IBIS 3.2 SYNTAX CANNOT DESCRIBE THE CHARACTERISTICS OF
ANY OUTPUT STRUCTURES THAT DYNAMICALLY CHANGES THE
IMPEDANCES DURING THE TRANSITION. THIS DEVICE USE SIMILAR
OUTPUT STRUCTURE AND THEREFORE THE SIMULATION RESULTS
MAY NOT BE ACCURATE. TI RECOMMENDS THE USE OF SPICE
SIMULATION WHEN SIMULATION ACCURACY IS IMPORTANT.

This device includes a one-shot circuit at the output of each pin (OS) that increases the drive strength for a short period of time (~30ns).  This is represented by the "OS" model, while the other model represents the static model.  These two can be used in parallel to more accurately represent the output of the device, however the difference in the edges is minimal from just using the OS model -- I would recommend to do any type of signal integrity analysis with the OS model set to a 30ns pulse width.