RE: [IBIS-Users] Programable drive and termination strenght

Jeremy,

Thanks for the reply. That's another option I hadn't
thought of. Having separate models for the driver and
terminator would avoid redundant driver models, and
the user doesn't have to text edit the file. However,
it does require them to change their component setup
in the simulator to switch from the output model to
the input model.

I guess I'll have to pick my poison and figure out
which solution is the least painful.

Thanks,

Michael

--- Jeremy Plunkett <jeremy@broadcom.com> wrote:

> Michael,
> As long as your driver and terminator are separate
> components on die and
> don't have any unusual interactions, it should be no
> problem to just build
> them as separate IBIS models. There is no issue
> with connecting multiple
> IBIS models to the same die pad.
>
> Jeremy
>
> -----Original Message-----
> From: owner-ibis-users@eda.org
> [mailto:owner-ibis-users@eda.org] On Behalf
> Of Michael Sachtjen
> Sent: Thursday, February 10, 2005 11:10 AM
> To: ibis-users@eda.org
> Cc: michael.l.sachtjen@tek.com
> Subject: [IBIS-Users] Programable drive and
> termination strenght
>
>
> Greetings,
>
> I have a GDDR3 interface with programmable drive
> strength, as well as programmable, dynamic on-die
> termination strength. I'm handling the programmable
> drive strength using the Model Selector and I'm
> handling the on-die termination using a
> Dynamic_clamp
> Submodel. However, since I have programmable
> termination values as well, and the Model Selector
> seems to only work for the top model, not submodels,
> I
> need to duplicate each of my top models for every
> combination of submodel. Either that, or have
> multiple enteries in the Add Submodel section and
> comment out all but the one model I want to use.
> Then
> I have to text edit the file every time I want to
> use
> a different termination strength.
>
> Is there something that I'm missing? Is there a way
> of selecting a drive strength, and termination
> strength, independent of each other without
> replicating the top model for every possible sub
> module? Right now I'm modeling 4 drive strengths
> and
> 2 termination values, but worst case scenario is 15
> settings of each.
>
> Here are some snippets of my ibis file to clarify
> what
> I'm doing:
>
> [Model Selector] GDDR3_PAD
> |
> GDDR3_OCD6_ODT4 drive strength = 6X, termination =
> 4X
> GDDR3_OCD6_ODT2 drive strength = 6X, termination =
> 2X
> | etc.
>
> [Model] GDDR3_OCD6_ODT4
> [Add Submodel]
> ODT4 Non-Driving
> |
> | Complete model for drive strength = 6X
>
> [Model] GDDR3_OCD6_ODT2
> [Add Submodel]
> ODT2 Non-Driving
> |
> | Complete model for drive strength = 6X
>
> [Submodel] ODT4
> Submodel_type Dynamic_clamp
> [POWER Clamp]
> | .
>
> [Submodel] ODT2
> Submodel_type Dynamic_clamp
> [POWER Clamp]
> | .
>
> Thank you,
>
> Michael
>
>
>
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Received on Mon Feb 14 14:00:46 2005