[PCB_FORUM] Re: Using an "Electrical CSET" vs a "Constraint Set" for diff pairs...

If you have different line widths and gaps you "Must use physical
constraint set" as CM does not have the ability to assign different
parameters on a layer by layer basis. This al changes in Version 16.xx

Gerry Meier, Sr. PCB Designer
Freedom CAD Services. Inc
Voice: (256)776-7470 or (603) 864-1350
Email:gerry.meier@xxxxxxxxxxxxxx
visit us at http://www.freedomcad.com
 
 

-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Austin Franklin
Sent: Wednesday, March 26, 2008 3:05 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Using an "Electrical CSET" vs a "Constraint
Set" for diff pairs...

Hi George,

I loaded 15.7, and don't see it any different than in 15.2.  Unless I
missed
something...but the spreadsheet only allows me to use "Electrical
Constraint
Sets", not any of the "Constraint Sets" that are setup in
"Physical(Lines/Vias) Rule Set" "Set values...".

Best Regards,

Austin

> -----Original Message-----
> From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
> [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx]On Behalf Of
> george.h.patrick@xxxxxxxxxxxxx
> Sent: Wednesday, March 26, 2008 1:06 PM
> To: icu-pcb-forum@xxxxxxxxxxxxx
> Subject: [PCB_FORUM] Re: Using an "Electrical CSET" vs a "Constraint
> Set" for diff pairs...
>
>
>
> This was addressed in 15.5 (if I remember correctly)
>
> --
> George Patrick
> Tektronix, Inc.
> Central Engineering, EDS Applications Support
> P.O. Box 500, M/S 39-512
> Beaverton, OR 97077-0001
> * 503-627-5272 (voice)     * 503-627-5587 (fax)
> http://www.tektronix.com    http://www.pcb-designer.com
>
> "Off-Grid and Proud of it!"
>
>
> -----Original Message-----
> From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
> [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Austin
Franklin
> Sent: Wednesday, March 26, 2008 11:39
> To: icu-pcb-forum@xxxxxxxxxxxxx
> Subject: [PCB_FORUM] Using an "Electrical CSET" vs a "Constraint Set"
> for diff pairs...
>
>
> Hi,
>
> There appear to be two ways to get the diff pair spacing and gap, but
> only
> one allows differing them by layer.  Setting up an "Electrical CSET"
> only
> seems to allow one overall (as in for all layers) space/gap.  But, the
> advantage of using the ECSET is you can assign it to a net or multiple
> nets
> using the Constraints Manager spreadsheet using a pulldown menu.
>
> Or, I can setup a "Constraint Set" and select each layer's
> space/gap...but I
> then have to attach this as a property to each and every net manually
by
> selecting the nets and attaching this Constraint Set name as a
> NET_PHYSICAL_TYPE attribute.
>
> I prefer the Constraint Set, since it gives me the per layer
> control...but
> the thing that seems to be missing, is the ability to assign a given
> Constraint Set to the nets using the Constraint Manager spreadsheet.
>
> I'm on 15.2.  Am I missing something?  If not, has this improved on
15.7
> or
> 16?
>
> Regards,
>
> Austin
>
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