Thanks Ian. I did as you suggested and lo, I get 20 mils around pads and
vias---but not around tracks on Mid 1! Confusion and bewilderment abound. I
will keep trying...to paraphrase Winston Churchill "Never, never, never give
up!"
> -----Original Message-----
> From: Ian Wilson [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, August 08, 2001 7:52 PM
> To: Protel EDA Forum
> Subject: Re: [PEDA] Polygon plane, incorrect clearance around
> Multilayer
> pads and via s
>
>
> On 07:23 PM 8/08/2001 -0400, Darryl Newberry said:
> >Hi people,
> >
> >More frustrating problems with (IMO) very basic
> features....Help files are
> >no help as usual. Knowledge base is down.
> >
> >Polygon plane on Mid 1.
> >Clearance around Multilayer pads and vias is incorrect (8
> mil not 20 mil).
> >However, clearance is correct for tracks on Mid 1.
> >Why would the rule Clearance shown below (8 mil) override
> the Clearance_3
> >rule? Is there a workaround? I need a 20 mil gap!
> >
> >Relevant rules pasted from the Rules report.
> >
> >Clearance Constraint :
> > Enabled = Yes Name = Clearance
> > Scope1 = Board
> > Scope2 = Board
> > Connectivity = Different Nets
> > Gap = 8mil
> > Rule Followed By Router
> >
> > Enabled = Yes Name = Clearance_3
> > Scope1 = Mid 1 & Polygon
> > Scope2 = Mid 1 & Thru-Hole Pad, Via
> > Connectivity = Different Nets
> > Gap = 20mil
> > Rule Followed By Router
> <..snip..>
>
>
> Darryl,
>
> I guess this second rule is the issue. Protel does *not*
> think that a
> thru-hole (multi-layer) pad exists on the individual layers,
> for the design
> rules at least. I want this repaired/changed as there have
> been a number
> of times when I wanted layer specific rules for thru-hole
> pads/vias. (The
> most recent time this came up for discussion was during a
> discussion on
> tenting the top layer but leaving all the bottom sides of
> vias exposed.)
>
> Change Scope2 to simply "Thru-Hole Pad, Via" and I think it
> should then
> work. Adding the extra layer scope in Scope2 does not increase the
> strictness of the rule (as Scope1 already restricts its
> application to
> Mid1) but it causes the rule to never be applied as then
> boolean expression
> (Mid1 AND multi-layer) is always FALSE.
>
> I haven't tested the above but I think it should work.
>
> Ian Wilson
>
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