[SI-LIST] : IBIS model question

Peterson, James F (jfpeterson@space.honeywell.com)
Fri, 5 Sep 1997 13:09:21 -0400

Andy I think your partly right (see below), the IBIS goal was initially
to model just component i/o, but I believe it has evolved to include
interconnect. Although I've never seen one, I've heard of connector IBIS
models that are made available from connector manufacturers. Also if you
look at the IBIS spec., version 3.0, around page 39 you will see that
interconnect is definitely included in the latest spec.
But what I'm looking for (a twisted pair cable model for a high speed
ecl differential i/f analysis) might be a variation of a package
model....possibly? suggestions?
thanks for your feedback,
jim

>----------
>From: Andy Ingraham[SMTP:ingraham@wrksys.ENET.dec.com]
>Sent: Friday, September 05, 1997 9:46 AM
>To: jfpeterson@fl51mail.space.honeywell.com; si-list@silab.eng.sun.com;
>jfpeterson@fl51mail.space.honeywell.com
>Cc: si-list@silab.eng.sun.com; ingraham@wrksys.ENET.dec.com
>Subject: Re: [SI-LIST] : IBIS model question
>
>> Anybody know where I can find an IBIS model for a shielded twisted pair
>> cable? The cable model would be used to help analyze a differential ecl
>> interface.
>
>Um, this is not what IBIS is for. IBIS ("I/O Buffer Information
>Specification") is used to describe active circuits, where SPICE
>structural models reveal too much information which might be
>proprietary. IBIS models are generally 1-ports (loads, outputs).
>
>Me thinks you should be asking for a SPICE model; and because all but
>the simplest of t-line implementations differ among SPICE (and
>SPICE-like) vendors, you might want to specify which simulator you
>plan to use this with, among other things.
>
>Regards,
>Andy
>