| This directory contains standard format files for "sky130_ef_io", |
| which is an efabless addendum to the SkyWater I/O library "sky130_fd_io". |
| |
| sky130_ef_io does the following: |
| |
| (1) Changes the orientation of the corner pad from upper-right to |
| lower-left with a wrapper cell called "sky130_fd_io__corner_pad". Also |
| extends the power buses to make the dimensions of the corner pad |
| multiples of 1um. |
| |
| (2) Adds a 1um-wide spacer cell to complement the existing 5um-wide |
| spacer cell. |
| |
| (3) Adds wrappers for all the combinations of power pad base cell + |
| power pad overlay, to create all 12 combinations, for pads with |
| either high- or low-voltage clamps, connecting to one of the six |
| power domains vddio, vdda, vccd, vssio, vssa, or vssd. |
| |
| (4) Fix a DRC error in the SkyWater GPIO pad layout |
| |
| "sky130_ef_io" is open source copyright 2020 efabless, Inc. |
| Released under Apache 2.0 license |
