[SI-LIST] IBIS model doubt

Hi all,
I have some doubts regarding the usage of IBIS models.
In the IBIS model,
1. Ramp measurement is done with a default value of 50ohms (R_load) connected 
to vref.
2. Also Rising/Falling waveforms can be simulated/measured with 
R_/L_/C_fixture/V_fixture.
3. Cref and Rref  for specifying the way delay was measured by the 
manufacturer.

With the above information incorporated in the IBIS file, if used for 
simulating
will it be correctly representing the I/O?
For e.g. with R_/L_/C_fixture/V_fixture/R_load effects included in the waveform 
data, if I make 
some external terminations, it is in addition to the R_fixture/R_load and may 
not correctly represent the system.

Instead, why don't we have only the un-loaded I/O buffer modeled in the IBIS 
so that
the designer who is using IBIS can put appropriate interface and do the 
simulations.

Regards,
Canes


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