[PCB_FORUM] Generic signal model in Orcad

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

408.895.1262   direct

408.482.5788   mobile

408.895.1362   fax

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