[PCB_FORUM] Re: setting diff pairs to only route on a certain layer pair in stackup?

 
'Layer Set' functionality was introduced in Release 15.5. This allows
you to lock critical nets to a hierarchical set which can consist of 1-N
layers. A Bus, DP, Net or Xnet can reference several layer sets. Once
routing beings on one of the layers of a set, the remainder of the route
is 'locked' in that set. 

The attached graphic shows the interactive routing of a bus locked on
layerset LS6-7. Note the legal layers in the control panel are
accentuated in a bold font. Constraint Manager reports the accumulated
length of non layer set based etch in the last column (typically pin
escapes). An example of a FAIL would be a route than skipped from Layer
4 to 7.



Ed Hickey
Product Engineer - Allegro PCB Editor
Cadence Design Systems
Chelmsford, MA 01824
978-262-6545

-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of
george.h.patrick@xxxxxxxxxxxxxx
Sent: Thursday, November 03, 2005 11:45 AM
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Subject: [PCB_FORUM] Re: setting diff pairs to only route on a certain
layer pair in stackup?


You're too early, Natalie.  

I think 15.5 has that feature.  Or maybe 15.5.1?

--
George Patrick
Tektronix, Inc.
Central Engineering, Engineering Design Services P.O. Box 500, M/S
39-512 Beaverton, OR 97077-0001
Phone: 503-627-5272         Fax: 503-627-5587
http://www.tektronix.com    http://www.pcb-designer.com

It's my opinion, not Tektronix' 



-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of
NAT9@xxxxxxxxxxxxx
Sent: Thursday, November 03, 2005 07:51
To: icu-pcb-forum@xxxxxxxxxxxxx; skill_school@xxxxxxxxxxxxxxx
Subject: [PCB_FORUM] setting diff pairs to only route on a certain layer
pair in stackup?


Hey,

Don't know if this is possible, but here is what I want to be able to
do.

First, I'm on WIN2000 using Allegro PCB Editor 15.2
s111 (9-13-05).

I would like a way to setup a constraint in Allegro so that Diff. Pairs
would route between a single layer pair.

I have 4 layer pairs in a 24 layer brd, and I want to set up a "if/then"
situation, such that if the diff pair starts on one layer of a layer
pair, then it could only change to the other layer within that same
layer pair, instead of switching to a completely different layer pair.

Am I expecting too much - or is there a way to do this?

Thanks in advance for any help I can get! ;-)

Natalie DeGennaro
Cisco Systems

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Attachment: layersets.png
Description: layersets.png

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