[SI-LIST] Re: Package Model in IBIS
- From: Sam Chitwood <samchitwood@xxxxxxxxxxx>
- To: "Muranyi, Arpad" <Arpad_Muranyi@xxxxxxxxxx>, pugal8686@xxxxxxxx
- Date: Mon, 27 Jun 2011 11:12:17 -0500
Hi Pugal,
You might also refer to a presentation I gave about IBIS package models.
Proper IBIS Package Modeling Techniques and Usage in Ideal-PDS and SSO
Simulations
http://www.vhdl.org/pub/ibis/summits/feb08/chitwood.pdf
Thanks,
Sam
On Mon, Jun 27, 2011 at 10:33 AM, Muranyi, Arpad
<Arpad_Muranyi@xxxxxxxxxx>wrote:
> Pugal,
>
> IBIS has three different ways to describe package models.
> The [Package] keyword is required but it only provides an
> overall package description for the entire chip. The [Pin]
> keyword has the ability to provide pin specific package
> information, and if present these numbers will override
> the ones in [Package]. The third method allows you to
> call a separate package model, using the [Package Model]
> and [Define Package Model] keywords. In the [Define
> Package Model] section you can describe a package either
> with the multi-segment uncoupled syntax or the single lump
> coupled RLC matrix syntax. This method overrides the
> previous two because it is considered the most accurate
> of the three methods.
>
> The first two methods only support RLC data, there is no
> length in this data. The RLC matrix is also without length.
> The only syntax that can provide length is the multi-segment
> uncoupled syntax, but even with this one, if length is 0,
> the tool has to implement the RLC data as a lumped model.
>
> I hope this helps,
>
> Arpad
> ============================================================
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of Newbie Pugal
> Sent: Monday, June 27, 2011 9:38 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Package Model in IBIS
>
> Hi All,
> I'm Little confused with the package model definition in IBIS.
>
>
> As far as I understand we can add Package model command and provide the
> package model details like RLC and length details.
>
>
> My doubt is if we do not have the package Model definition in the IBIS file
> will the RLC values given for each pin consider as a package model? If so
> the Length details are ignored?
>
>
> What is the use of the lumped RLC values provided in the IBIS file?
>
> Since I'm new to SI Please provide some basic information about Package
> Model in IBIS.
>
> Thanks
> Pugal
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