Must set PYTHONPATH to include OPENRAM_HOME now.
Reorganizes subdirs as packages.
Rewrites unit tests to use packages.
Update README.md with instructions, dependencies etc.
Update sky130 module imports.
Change tech specific package from modules to custom.
Add hard decoder gates (nand, inv, pnan)
Add conditions for routing using LI layer in s8.
Generalize bus layers for decoders.
Move custom cells to own directory.
Fixed via directions, etc.
Add 4x16 hierarchical decoder and test case
sram_factory cannot handle duplicate module name, thus we bail out and
raise an error if a user attempts that.
Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
modules overridden by the user are the highest priority, then modules
overridden by the technology. If nothing is overriden, use the defaults
from OPTS (if they exist) or use the requested module_type.
This fixes that custom tech_modules could not be used, if they had a default in
OPTS even if the latter was not overridden by the user.
We don't need extra defaults in the tech_modules, as we now only use them,
if they have been overridden by the tech_module.
Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>