RE: [IBIS-Users] IBIS EBD files

Dear Giovanni,

If I remember the spec correctly:

- All capacitors in a path description are "parallel" (i.e. one side of the
  capacitor is connected to the path and the other side is implicitly
  connected to ground).  I believe the only way to get a capacitor to be in
  series with the path is to make use of an IBIS model of a series capacitor.

- The EBD format doesn't support loops in a path.  Each branch (fork) in a
  path is expected to end at a pin (either one of the EBD's external connector
  pins or at the pin of a 'Node') or to simply end.  If you want a loop in the
  path, then again, you must use an IBIS mode of a series element.

Best regards,
Matthew Flora



> -----Original Message-----
> From: owner-ibis-users@eda.org 
> [mailto:owner-ibis-users@eda.org] On Behalf Of Abril, 
> Giovanni (Space Technology)
> Sent: Tuesday, August 02, 2005 11:43 AM
> To: ibis-users@eda.org
> Subject: [IBIS-Users] IBIS EBD files
> 
> Hello IBIS gurus,
>  
> I'm trying to determine how to specify an RC path in EBD 
> format that looks like this:
>  
> J1----------------------C2---------------------------Tline----
> --------------Rpullup
>          |         \-------R2---------------/
>          |
>         C1
>          |
>          |
> J2------- (GND)
>  
>  
> I'm not sure how to describe the Path for the parallel C2, R2.
> Here's what I've got:
> Pin J1
>    Fork
>    L=0 C=2p / (this is C1 cap)
>    Pin J2
>    End Fork
> L=0 C=4p /  (this is C2 cap)
>  
> L=58 L=? R=? C=? / (this would be my tline)
> Node U21.1 (call to my pullup model)
>  
> How do I connect R2 in parallel with C2? Another fork staement?
>  
> Thanks,
> Giovanni
>  
> 
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