Depending on what you are trying to do, I might have a workaround for you.
Normally, orphans are only removed if there is at least one real connection
to a poly. If the poly does not connect to any of the contained nets, it
will fill around in as much of the area as possible.
Suppose you want to stop ground fill under a BGA or some other object with
regular connections. In this case, you can set the ISOLATE parameter to the
pad spacing, and now the poly will be empty. Be sure to inspect the edges
for "same signal" clearance violations that DRC won't catch.
Be sure to set the rank on the inner poly lower than the containing poly,
use a different signal name, and adjust the isolate parameter to prevent
ground fill without generating DRC errors.
Hope that helps...
Jay
"Tilmann Reh" <usenet2007nospam@autometer.de> wrote in message
news:hoij8o$rf9$1@cheetah.cadsoft.de...
John Bachman schrieb:
>
>> I have an area where I want to exclude the bottom ground plane. I
>> thought that I could just draw a polygon around the area to exclude
>> which is inside the GND polygon but that does not seem to work. There
>> is still ground plane inside the new polygon. How can I do this?
On the bottom layer, you can simply draw the outlines of your exclusionarea in the bRestrict layer.
On the bottom layer, you can simply draw the outlines of your exclusion
area in the bRestrict layer.
A polygon (orphan) should basically also work, but at a short test itdidn't work here, too - maybe there's a (new?) bug in polygon calculation?
A polygon (orphan) should basically also work, but at a short test it
didn't work here, too - maybe there's a (new?) bug in polygon calculation?
Tilmann
