[PCB_FORUM] Re: Constraint manager xnets

Yes, I did create a matched length group. But I had the pin pairs set to longest pin pair. Now with that removed, I am hoping it will route.
+/-25mils is for a DDR Rouble Data Rate match requirement for data to strobe.
Still working on it.
Thanks,
Mark

austin@xxxxxxxxxxxx wrote:

Hi Mark,

Did you setup matched length groups?

BTW, why do you need to match to +-25 mils?  That's a requirement for an
8GHz length match in my book!

Regards,

Austin

Original Message:
-----------------
From: Mark Salberg msalberg@xxxxxxxxxxxx
Date: Fri, 27 Jan 2006 10:56:24 -0500
To: icu-pcb-forum@xxxxxxxxxxxxx
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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