[PCB_FORUM] Re: differential spacing clearance specification problem...
- From: "Austin Franklin" <austin@xxxxxxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Mon, 21 Mar 2005 18:01:21 -0500
Hi Stephen,
Thanks! That did it. Luckily, that property gets set when I set "Line
Spacing/Min" in the Differential Pair worksheet in the Constraints Manager,
which makes it easy to add.
Their naming is certainly confusing, at least to me. They might want to
give some indication what they mean by "Line Spacing" in this context, that
it is actually the minimum acceptable gap (including any reduced gap for
"necking").
Regards,
Austin
> -----Original Message-----
> From: Feehan, Stephen [mailto:Stephen.Feehan@xxxxxxxxxxx]
> Sent: Monday, March 21, 2005 3:03 PM
> To: 'icu-pcb-forum@xxxxxxxxxxxxx'
> Subject: [PCB_FORUM] Re: differential spacing clearance specification
> problem...
>
>
> Hello Austin,
> If you add a Diffp_min_space property = 4.5 mil it will clear the DRC.
> This is a new constraint that was added in V15.2.
>
> -Stephen
>
> -----Original Message-----
> From: Austin Franklin [mailto:austin@xxxxxxxxxxxx]
> Sent: Monday, March 21, 2005 2:23 PM
> To: PCB Forum Mailing List
> Subject: [PCB_FORUM] differential spacing clearance specification
> problem...
>
>
> Hi,
>
> I have set-up the following in Allegro 15.2:
>
> Using the Constraint Manager spreadsheet, differential signals are paired.
> Line spacing and gap etc. are NOT specified in the spreadsheet, only phase
> tolerance and uncoupled length.
>
> In Constraints/Physical rule set I setup a Constraint Set Name
> "100_OHM_DE"
> and have set DiffPair primary gap to 4.5 mils.
>
> In Constraints/Spacing rule set I setup a Constraint Set Name
> "DIFF_SPACING"
> and give a Line to Line spacing of 9 mils.
>
> What my goal is here, is to have a differential gap of 4.5 mils, and a
> differential pair to any other signal clearance of 9 mils.
>
> I then set-up via the assignment table and constraint manager so
> that these
> rules apply to the differential pair signals under General
> Properties/Physical, using Constraint Sets-Physical & Spacing.
>
> What I get are trace to trace DRC errors within a differential
> pair, saying
> the target clearance is 9 mils, and there is only 4.5. There
> should only be
> 4.5, and it should not be checking trace to trace within the differential
> pair. What am I doing wrong? It *works* right, in that I get a
> differential gap of 4.5, and I get a pair to other signal spacing
> of 9, but
> I get the LL DRC errors.
>
> Regards,
>
> Austin
>
>
>
>
>
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