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Dear Syed,

   Magic version 7.2 does hierarchical netlist extraction.  The method
is to add "ports" to the subcells you want to have extracted as
subcircuits, before doing the "extract all" and "ext2spice" (exttospice,
in the Tcl-based version).  You add ports with the "port" command by
putting the cursor box over an existing label, and typing the command
"port make <number>" (e.g., "port make 1"), where the <number> is the
order of the port in the netlist definition of, and call to, the
subcircuit.  This method is specifically designed for use with standard
cells;  if you really want hierarchical SPICE, you will need to
extract and produce a SPICE deck separately for each subcell.  Note
that I don't have a method for magic to produce a ".subckt" record
(although I suppose I should, and it shouldn't be very difficult to
implement), so if you edit a subcell and produce SPICE output with
extract and ext2spice, you will still need to add the ".subckt ... .ends"
to the resulting deck.

					Regards,
					Tim

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