Subject: [IBIS] Re: [IBIS-Users] Does a clock driver IBIS model need to incorporate steady states witching effects?
From: Duane Mattheisen (duane.mattheisen@onsemi.com)
Date: Wed Nov 05 2003 - 16:39:32 PST
James
This is just my opinion. If the IBIS model is done at some high
frequency where the output does not reach a steady state then when some
else tries to use that model at a lower frequency the simulator will not
be able calculate the AC portion of the wave form. Perhaps a better
solution would be to have the propagation delay of the device equal the
delay from the left edge of the screen in the IBIS model. An example
psuedo-random might give different result depending on which cycle you
look at. Perhaps the worst case is what the customer needs. Thanks
duane Mattheisen
James_R_Jones@dell.com wrote:
>
> I have received some feedback recently that you would need
> a clock driver IBIS model to take into account the effects of
> steady state switching at some frequency. The feedback states
> that if you used the same silicon I/O cell for psuedo-random, or
> less frequent switching, then the IBIS model would need to be
> different to get the most accurate effect.
>
> Does anyone have any insight that could be helpful in explaining
> why this might be the case?
>
> James R. Jones
> Enterprise Engineering Signal Integrity Team
> Dell Inc.
> (512) 725-1809
>
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