[PCB_FORUM] Re: Generic signal model in Orcad

signal model.dat sources from device.dml.  use the auto feature to auto
map.

if your missing a symbol it shouldn't be a problem if the engineer isn't
controlling the rule.

select from Analyze pulldown > SI/EMI Sim > Models (for auto map)

select from Analyze pulldown > SI/EMI Sim > Library (for loading models)


Device Library Files:
device.dml
cds_models.ndx

Interconnect Library Files:
interconn.iml


-oscar
____________________________________________________
oscar miguelino | lead pcb engineer | OQO, inc.
583 shotwell street | san francisco, ca 94110

(this message constitutes confidential information proprietary to OQO, Inc.)


On Tue, Jun 3, 2008 at 2:26 PM, Christopher Nunn <cnunn@xxxxxxxxx> wrote:

>  Hi group,
>
>
>
> We are using Allegro Performance and Orcad Capture.
>
>
>
> We have recently been successful in embedding some Si constraints within
> Orcad so that the designs are driven from the front end.
>
>
>
> We have REL_PROP_DLY working with XNETs in Orcad.  Up until now we have
> been setting up SIGNAL_MODELs in Allegro.  We are only using a few device
> types at the moment.  A couple values of resistors and an rpack.   We
> currently do not have a plan to run front end simulation, so the SIGNAL
> MODELs we assign can be very generic – even the value makes no difference.
>
>
>
> We would NOW like the engineer to add the SIGNAL_MODEL property in Orcad
> just to those components that will be included in match delay groups.   The
> thought is that while the engineer is setting up the REL_PROP_DLY he/she can
> assign the SIGNAL_MODEL too.
>
>
>
> Can I create a completely generic SIGNAL MODEL for a resistor, store it in
> a library, and have Orcad grab it and pass it to Allegro?   I understand
> that SIGNAL_MODEL=YES must be added to my allegro.cfg file.
>
>
>
> Here is an example of a 22 ohm resistor that the system created:
>
>
>
> ("R_0402_DISCRETE_22_22"
>
>     ("ESpice"
>
> ".subckt R_0402_DISCRETE_22_22 1 2
>
> R1 1 2  22
>
> .ends R_0402_DISCRETE_22_22
>
> ")
>
>     ("PinConnections"
>
>       ("1" "2")
>
>       ("2" "1")
>
>     )
>
> )
>
>
>
> Allegro seems to keep this Espice model stored internally in the database.
> If I write this to a file, what file extension should be used, and where
> should it be stored?  Do I need a mapping file between the device and model
> too?  If so, I think it should be a .dat file extension.  Does it get stored
> in the same place?
>
>
>
> Any help would be appreciated.
>
>
>
> Thanks,
>
>
>
> *Chris Nunn*
> *PCB Engineering Manager*
>
> *2Wire, Inc.*
>
> 1704 Automation Parkway
>
> San Jose, CA 95131
>
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>
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>
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>
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