[PCB_FORUM] Re: Propagation Rules driven from Schematic to Allegro

You want to add a DIFFP_PHASE_TOL  <25 mil> to your diff pairs to
control the length between the pairs and not a Rel Prop Delay.  All of
the diff pair rules are easily controlled in Constraint manager and I
would recommend only passing the DIFFERENTIAL_PAIR property to define
your pairs and set everything else in Constraint Manager.

Hope this helps,
Michael Catrambone
UTStarcom, Inc.

________________________________

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Dale Rasmusen
Sent: Friday, April 25, 2008 1:55 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Propagation Rules driven from Schematic to Allegro

 

Hi all, I was wondering how to do the following...  

 

I have diff pairs that need to have REL_PROP_DELAY GRP:G:L:S::25
properties between P and N signals.. but I also want to place 20 of
these pairs in a group that must adhere to a PROP_DELAY of
L:S:1000:2000.

 

Thus I have P and N constraints as well as a group prop delay
constraint.

 

I'm not sure how to structure these rules for Allegro.  Your help is
appreciated.

 

Thanks,

 

 

Dale Rasmusen

CAD Manager

TEKNOVUS

(707) 665-0400 ext 133

(707) 665-0491 fax

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