I think it can be done by fiddling with the rank of the polygons

First make the rank of the main GND pour higher, say 3
Now make a polygon of rank2 where you want the isolated GND, but give it a
name other than GND
Clone the polygon you just created, make it rank1 and name it GND



On Thu, Apr 19, 2012 at 3:17 PM, Lee Mulvogue <lee@baudalign.com> wrote:

>
>
>        Hi all, I'm laying out my first "pro-quality" PCB with a PIC24FJ64=
,
> and have run into a little issue, but don't know if it's actually an
> issue or not.
>
>        In the spec sheet under External Oscillator Pins, it goes into gre=
at
> detail about creating an isolating GND pour around the OSC, and that
> this pour should be a separate entity from the "normal" GND pour that
> many (most?) use across the whole PCB.  I've created this isolating
> pour top and bottom, but I seem to have a problem with Eagle PCB in
> that I seem to only be able to create one "GND" polygon per layer, so
> can't do an isolation pour as well as a pour for the rest of the
> board.  Haven't found any threads on this topic elsewhere.
>
>        But the thing is, in any pictures I've found online of PIC-based
> PCBs, no-one seems to actually be doing this isolating "ring".  So is
> it really something I should be concerning myself with?  Or ideally,
> does anyone know a way of geting multiple "GND"-named polygons on a
> layer in Eagle?
>
>        Thanks for any input
>
>        Lee
>
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