Re: IBIS package modeling questions

From: Bob Ross <bob_ross@mentorg.com>
Date: Mon Mar 01 1999 - 08:53:36 PST

Greg:

My responses are in your text.

Bob Ross
Mentor Graphics

> From owner-ibis@server.eda.org Mon Mar 1 07:59 PST 1999
> From: gedlund@us.ibm.com
> To: ibis-users@vhdl.org
> Date: Mon, 1 Mar 1999 09:53:31 -0600
> Subject: IBIS package modeling questions

> Hello All,

> My understanding is that there are five levels of package modeling in IBIS:

> 1. R_pkg, L_pkg, C_pkg
> 2. R_pin, L_pin, C_pin
> 3. Coupled lumped model using the [Resistance/Inductance/Capacitance
> Matrix] keywords
> 4. Distributed (segmented) package model using subparameters under the
> [Pin Numbers] keyword
> 5. EBD

> Are levels 3 and 4 mutually exclusive, i.e. is it possible to create a
> coupled, distributed package model?

Levels 3 and 4 as you define them are mutually exclusive. Within the
current Version 3.2 level of IBIS you can only have a single stage
of coupled package information, or multiple sections (segmented) of
uncoupled package information consisting of discrete and distributed
elements.

> I assume the existence of modeling data at levels 3 and 4 overrides data at
> levels 1 and 2. Is this true?

Yes. Information in 2 overrides default information in 1. Any information
in 3 or 4 overrides information in 1 or 2.

> Thanks for your time.

> Greg Edlund
> Advisory Engineer, Critical Net Analysis
> IBM
> 3650 Hwy. 52 N, Dept. HDC
> Rochester, MN 55901
> gedlund@us.ibm.com
Received on Mon Mar 1 08:59:56 1999

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