One more comment on the use of blowouts (voids) on inner planes. Protel, in
company with nearly all CAD systems, does *not* DRC these planes beyond
certain simple tests. You must manually be *certain* that Protel does not
think that any connections are being made in the voided areas of a plane,
for your blowouts -- manually placed or calculated by the software from
your design rules -- may remove the copper for those connections. This is
true even *without* additional blowout primitives manually placed, if the
plane expansion rules are such that expansions from adjacent pads overlap.
An error here will only *remove* connectivity, it will not add it, so a bad
board from this will be relatively easy to patch, whereas a short on an
inner plane is a nuisance and three-quarters. As far as I know, your DRC
should guarantee that there are no shorts, unless you have a connecting pad
on a split plane boundary, about which DRC warns. This *might* cause a
problem. Inspect the photoplots for inner planes carefully!
[EMAIL PROTECTED]
Abdulrahman Lomax
Easthampton, Massachusetts USA
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