tree e462ae451f9dab929e4510368dc0f80aec12a355
parent 29f0c21cf67330edfded5c2abfe4cf61b692005a
author Tim Edwards <tim@opencircuitdesign.com> 1640895454 -0500
committer Tim Edwards <tim@opencircuitdesign.com> 1640895454 -0500

Corrected the parasitic capacitance tables in the magic techfile to
account for deep nwell to substrate, and shielding of fringing
capacitance from poly and all metal layers to substrate by nwell
and pwell, which was missing.  The missing shielding caused nodes
to have coupling capacitance to substrate even when they were
shielded from substrate (the plate area capacitance was calculated
correctly, but the fringing capacitance can be large).