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I've got a big layer table with a bunch of "junk" layers from
the "incumbent" CAD tool. I've made a .lyp that suits me as
far as fill colors, frames, stipples.
What I can't find, is any GUI facility to "order" the layers such
that later layers "step on" earlier (in the process flow) layers,
but not vice versa, when displayed.
For example "TANK" (NPN collector) should be "underneath"
PBASE and it's OK if PBASE obscures part of the TANK rectangle.
But what I have, makes TANK blot out PBASE (if solid fill). Now,
PBASE has a higher GDS# (35/1) than TANK (99/1) and I am
stuck with the foundry's number assignments. If layer ordering
(visual stack) depends only on that, then I'm hosed. But does it?
What sets the "stack order" (NEMIT should be "above" PBASE,
PBASE "above" TANK, CONT above both NEMIT and PBASE,
MET above all.
Is there anything I can do by hand editing the .lyp to cause
the display-order to change as desired (like, is order defined
by "order of appearance" in the .lyp?
I've played with trying to make "transparent-ish stipple stacks"
but there's enough layers vertically that this ends up bending
the displayed color, as a "mash-up" (like, blue for P and red for N
ends up purple where they intersect). I'd rather allow an upper
implant to occult a lower one than try to make the lower layers