I believe you can break up the ground pour (make an island) by drawing in l= ines on the restrict layer..be it bottom or top. If you make a complete is= olated island you will need to tie it with a via to another layer with the = same signal else when you do the pour..nothing will be there since there is= n't an attached net. -----Original Message----- From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of= Lee Mulvogue Sent: Wednesday, April 18, 2012 11:18 PM To: piclist@mit.edu Subject: [PIC] Do you use isolated GND pour for osc? =20 Hi all, I'm laying out my first "pro-quality" PCB with a PIC24FJ64, and ha= ve run into a little issue, but don't know if it's actually an issue or not= ..=20 In the spec sheet under External Oscillator Pins, it goes into great detai= l about creating an isolating GND pour around the OSC, and that this pour s= hould 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, bu= t 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 top= ic elsewhere.=20 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 some= thing I should be concerning myself with? Or ideally, does anyone know a w= ay of geting multiple "GND"-named polygons on a layer in Eagle?=20 Thanks for any input=20 Lee ------------------------- Msg sent via Webmail - http://hosting.myob.com/ -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membershi= p options at http://mailman.mit.edu/mailman/listinfo/piclist This e-mail message, its contents and any attachments to it are confidentia= l to the intended recipient, and may contain information that is privileged= and/or exempt from disclosure under applicable law. If you are not the int= ended recipient, please immediately notify the sender and destroy the origi= nal e-mail message and any attachments (and any copies that may have been m= ade) from your system or otherwise. Any unauthorized use, copying, disclosu= re or distribution of this information is strictly prohibited. Email addre= sses that end with a ?-c? identify the sender as a Fusion-io contractor. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .