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Dear Atul,

> But tool gives some errors saying "label on unknown layer/datatype
> layer=40  type = 0"

Some layout tools add extra layers like bounding boxes or special boxes
to give hints to an extractor.  These layers are not recognized by
magic.  Magic *should* be able to read all of the "important" (i.e.,
physical) layers.  To find out what GDS layer 40 is, you would need to
go to the TSMC process specs and/or design rule documentation.  However,
that only is true if the file you are reading really is a TSMC process,
as opposed to a clone process like the Chartered Semiconductor 0.18,
which has its own GDS layer numbers.  The GDS file format only allows
numbers for layers, so it's not easy to figure out what GDS numbers
correspond to what layers without some documentation in front of you.

> It also gives one  warning saying "Calma Reading is not undoable!! I hope
> its okay"

This just means that the magic "undo" command can't be used to get rid
of what you just read in.  The implication is that you should save all
your work before doing a CIF or GDS read command, because it something
fouls up, you may have to exit and restart the program.

> And at the time of invoking magic it says " Unable to alocate 7 planes in
> default colormap; making a new one"

That's a standard warning message on 8-bit color visuals, because magic
wants to allocate a big chunk of the colormap.  Usually the result of
installing its own colormap is that the screen colors will toggle as
you move to and from the magic window.  Some systems like Silicon Graphics
machines don't have the problem; nor do systems with video cards 
supporting 8-bit overlays on top of 24-bit color visuals.

A comment about reading GDS files:  Unlike CIF, GDS has no "top level"
cell.  So unlike reading CIF, nothing shows up when you read GDS.  To
see what cells have been loaded, do the command "list all".  Then you
can use the "load" command to display the cell you want.

Hope that helps.

						Regards,
						Tim

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