Afshin,

Addition of the secondary planes has to be done in a certain way,
or Protel has trouble allocating the plane areas. To add secondary
Split Planes, it's necesary to create "holes" on the Primary Plane
by editing its vertices (ie, by doing Edit Move Polygon Vertices, 
selecting the polygon, then dragging the handle {a small cross in the 
middle of a side of the plane polygon} to a new location). Continue
until sufficient space is created for the new Split Plane, and add the new
plane. Though the edges of the Split Planes can coincide, be sure not to 
overlap copper areas of the various planes. 

Also note that the Primary Plane must not be "closed", or completely
enclosing any Secondary Plane. You must "break" the margin of the
Primary Plane toward the edge of the board to create a gap in the
Primary Plane for each Secondary Plane. Protel's Help system has an
example, I believe. Check Plane current density and signal layer paths to 
determine the best place to create these gaps.

These are supposed to be hard and fast rules, but I've had boards that
checked and ran OK even with small embedded Split Planes. But the
procedure should be followed, since DRC results and plane connection 
assignment is unpredictable if it's not.

I'm sure others have more tips.

Brian

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