| Tim Edwards | 1134fbc | 2020-10-12 22:35:42 -0400 | [diff] [blame] | 1 | This directory contains standard format files for "sky130_ef_io", |
| Tim Edwards | ab5bae8 | 2020-07-05 17:40:59 -0400 | [diff] [blame] | 2 | which is an efabless addendum to the SkyWater I/O library "sky130_fd_io". |
| Tim Edwards | 55f4d0e | 2020-07-05 15:41:02 -0400 | [diff] [blame] | 3 | |
| Tim Edwards | 1134fbc | 2020-10-12 22:35:42 -0400 | [diff] [blame] | 4 | sky130_ef_io does the following: |
| Tim Edwards | 55f4d0e | 2020-07-05 15:41:02 -0400 | [diff] [blame] | 5 | |
| 6 | (1) Changes the orientation of the corner pad from upper-right to |
| Tim Edwards | ab5bae8 | 2020-07-05 17:40:59 -0400 | [diff] [blame] | 7 | lower-left with a wrapper cell called "sky130_fd_io__corner_pad". Also |
| Tim Edwards | 55f4d0e | 2020-07-05 15:41:02 -0400 | [diff] [blame] | 8 | extends the power buses to make the dimensions of the corner pad |
| 9 | multiples of 1um. |
| 10 | |
| 11 | (2) Adds a 1um-wide spacer cell to complement the existing 5um-wide |
| 12 | spacer cell. |
| 13 | |
| 14 | (3) Adds wrappers for all the combinations of power pad base cell + |
| 15 | power pad overlay, to create all 12 combinations, for pads with |
| 16 | either high- or low-voltage clamps, connecting to one of the six |
| 17 | power domains vddio, vdda, vccd, vssio, vssa, or vssd. |
| 18 | |
| Tim Edwards | 1134fbc | 2020-10-12 22:35:42 -0400 | [diff] [blame] | 19 | "sky130_ef_io" is open source copyright 2020 efabless, Inc. |
| Tim Edwards | 55f4d0e | 2020-07-05 15:41:02 -0400 | [diff] [blame] | 20 | Released under Apache 2.0 license |
