Re: some questions with the IBIS models

Jason,

Does ibischk3 pass the IBIS file without warnings? Ibischk3 will try
to warn you if the Rising and/or Falling waveforms are not matched to
the Pullup/Pulldown IV curves. A mismatch could cause the symptoms
you describe, but there could be other causes too. Check the XTK files
to see if the DRIVERSPEC V scale goes from 0.0 to 1.0 with the endpoints
at about the right times.

Mike LaBonte

Jason Leung wrote:
>
> Hi All:
> This is my second time to pose a question in the Si list. I just start
> working as a Si engineer a few weeks ago
> ,and the problems that I am facing right now is trying to verifly the
> IBIS model.
> The procedure that I am following is like this:
> 1.use ibis2xtk to transfer the file from ibis to QUAD
> 2. then I use the scratchpad to build the schematic according to the
> spec for the R-fix and Voltage
> (i.e. I am building the six files for XNS)
> 3. then I use XNS to observe the waveform and check the rising and
> falling waveform
>
> My problem is even though I am building my schematic use scratchpad
> according to the spec,
> but my waveform can not acheive its full voltage swing . I wanted to
> know why , and The way that
> I should approach to fix this problem.
>
> thanks to all of you that they can help to solve this problem as this is
> very important for me to get this concept
>
> thanks
> Jason Leung ( Alcatel)
 
Received on Tue Mar 13 08:34:06 2001