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#sky130
Title
# sky130
j

Julien FAUCHER

01/10/2022, 11:43 AM
Hello everyone ! I was following the Floorplanning tutorial for siliconcompiler (https://docs.siliconcompiler.com/en/latest/tutorials/zerosoc.html#minimal-chip-configuration) which mention
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FILL_CELLS = ['sky130_ef_io__com_bus_slice_1um',
              'sky130_ef_io__com_bus_slice_5um',
              'sky130_ef_io__com_bus_slice_10um',
              'sky130_ef_io__com_bus_slice_20um']
which, I believe, are the cells used to build the padring between IOs. As the tutorial seems to use a dummy lib (
sky130_dummy_io.lib
) I wanted to try with the actual PDK and I found mention of padring corners with
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./libraries/sky130_fd_io/latest/cells/corner_bus_overlay
./libraries/sky130_fd_io/latest/cells/corner_bus_overlay/sky130_fd_io__corner_bus_overlay.gds
but nothing about actual slices within the PDK. Is this to be expected ?
t

Tim Edwards

01/10/2022, 4:35 PM
Files in the path
skywater-pdk/libraries
are all directly from the Google/SkyWater open source PDK repository. The cells you mention are efabless libraries that provide missing functionality and fill in gaps in the open source PDK. Those cells are part of the
open_pdks
installer (https://github.com/RTimothyEdwards/open_pdks). Use the
open_pdks
installer to obtain them.
j

Julien FAUCHER

01/11/2022, 3:38 PM
Thanks for the feedback. Just to be sure, is using open_pdks the preferred way to install SKY130 ? (Or is there even a "preferred" way to install it ?)
t

Tim Edwards

01/11/2022, 7:32 PM
Yes, using open_pdks is the preferred way to install SKY130.