[PCB_FORUM] Re: Constraint manager xnets

Under delta either change 25 to 12.5 or use :25 mil if you do not want
to match t oa target.


Gerry Meier
Sr. PCB Designer
Freedom CAD Services, Inc.
Voice: (603) 864-1300 x1350
AL Voice: (256) 417-6944
Email: gerry.meier@xxxxxxxxxxxxxx
Visit us at www.freedomcad.com

-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Patrick Jabbaz
Sent: Friday, January 27, 2006 11:59 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Constraint manager xnets

Hi Mark
Here are the steps
Under Relative propagation in CM
1) Select the xnets you want to match
2) create a match group of the selected nets by right click
3) The new matched group created select Drivers and receiver
4) Under Delta:tolerance  enter 0:25
Note: you need to assigned a length restriction on the short side of the
series termination, reason, is that you really do not want to add length
at the short side of the series termination, any extra trace delay
should be added at the receiver side of the signal.

Patrick Jabbaz
Sr. Hardware Eng.
Xilinx
2100 Logic Drive
Building 1, Floor 2
San Jose, CA, 95124
w: (408) 879-4709
Fax: (408) 377-9013
email: patrickj@xxxxxxxxxx

-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Mark Salberg
Sent: Friday, January 27, 2006 7:56 AM
To: Cadence User Group
Subject: [PCB_FORUM] Constraint manager xnets

Good Morning,
I am looking for some help routing xnets in Allegro or Specctra.

I have xnets defined from adding component models.
I set up a class of xnets for prop delay to match a target xnet to 
+/-25mils.
I created pin pairs of each xnet from driver, through terminator
resistors to receiver.

Xnet path=U1.1- R1.1-R1.8-U6.1
Created pin pair U1.1 : U6.1

How do I get Specctra to route the matched lengths.

Thanks for any input,
Mark


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