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Dear Mark,

> In this age of CMP rules, it would also be nice to check layer density.
> Presently I feed a flat CIf file to a script that calculates this.  For
> some reason my results don't always match with MOSIS.  It hasn't been 
> a problem since my results are always lower than MOSIS, so if my
> calculations pass the rules, I am good.
> 
> The other technique is to let MOSIS do the fill for you, but if I am
> going to fill in white space, I just assume fill with my
> poly-poly2-m1-m2-m3 bypass caps.

   Yes, actually after my last experience with trying to calculate
layer densities prior to submitting a layout, I decided I should add
that feature, as it should be fairly easy to implement.  I was also
thinking that it would be a useful feature to add "cifoutput" rules
for automatic fills---take everything on a plane to be filled, grow
it until it all gloms together, invert the result inside the layout
bounding box, and then apply a rule similar to "squares" to draw in
filler structures.

   Also a cifoutput "slots" rule would be nice, but the usual
requirement that slots need to be in the direction of current flow
makes this difficult to implement correctly in all cases.

					Regards,
					Tim

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