Re: accuracy BIRD

Hello Syed, Greg:

  Sorry for the delayed response -- I was out of the office back week and
am just now getting back to my mail. To elaborate: I was trying to make
a distinction between at V/T table that is created by an output driving a
pure, non-reactive impedance, and a V/T table created with the output driving
a more complex load. The *former* V/T table contains the data the simulator
needs/uses when building the output model. Specifically, it describes how
the pullup and pulldown transistor turn on/off, and does not -- indeed, should
not -- contain any extra time constants due to reactive elements. In the
latter case (complex, reactive impedences) the inclusion of these waveforms
is a check. Given the model that was build with the first V/T tables, the
question is can the simulator produce the waveform of the second case.

Hope this helps clarify things.

 Regards,
 Stephen Peters
 Intel Corp.

> Hi,
>
> Since the V/T tables allow keywords such as C_dut, R_dut, L_dut, doesn't
> that imply that it DOES use the package numbers. I am a bit confused about
> Stephen's statement below regarding old VT tables..
>
> Syed.
> Cisco Systems, Inc
>
> >
> > On the question of "golden waveforms" vs. "regular old VT tables," Stephen
> > Peters mentioned that there is a difference between the two. Golden
> > waveforms have the package while regular old VT tables do not. Is there
> > any syntactical construct within IBIS to differentiate between the two?
> > Care to embellish here, Stephen?
> >
> > Thanks all.
> >
> > Greg
> >
> >
> >
Received on Mon Mar 15 09:59:55 1999