[SI-LIST] IBIS MODEL QUESTION
- From: =?big5?b?U3RhbmxleS5DaGl1KKr0q6uyTSk=?= <Stanley.Chiu@xxxxxxxxxx>
- To: kfisher@xxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Thu, 28 Mar 2002 09:30:48 +0800
Hi, eveyone;
I have encountered some ibis model problems recently, these problems happend
quiet a lot, here are some examples errors below;..
ERROR - Model prbcbu: The [Rising Waveform]
with [R_fixture]=50 Ohms and [V_fixture]=0V
has TYP column DC endpoints of 0.00V and 0.68v, but
an equivalent load applied to the model's I-V tables yields
different voltages ( 0.01V and 0.77V),
a difference of 100.00% and 11.76%, respectively.
ERROR - Model prbcbu: The [Falling Waveform]
with [R_fixture]=50 Ohms and [V_fixture]=3.3V
has TYP column DC endpoints of 2.64V and 3.30v, but
an equivalent load applied to the model's I-V tables yields
different voltages ( 2.56V and 3.30V),
a difference of 3.27% and 0.00%, respectively.
I just wonder how does ibis checker to find these error?? and it's OK if I
ignore these message?? can I fix it by myself??
there's another case is that usually in the simulated waveform the Vmeas
falls between Vih and Vil, and then I can use it to measure the flight time
and buffer delay , but what if Vmeas is higher than Vih??I can't find a
reference point to do the dealy measrement! so dose this ibis model has
wrong number for Vmeas ( let's asy 3.3V) or I should use another approach
in my tool??
thanks
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