| 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) Adds overlay cells that connect the clamps to the different domains, |
| in four commonly-used configurations. |
| |
| (5) Adds wrappers for specfic combinations of power pad base cells + |
| power pad overlay + clamp connection overlay, to create 8 common |
| combinations. |
| |
| (6) (5/28/2021) Added a separate wrapper cell for the top_power_hvc_wpadv2 |
| cell for the "caravan" project to triple up metal to the pad for |
| high current supply applications. The clamp and the pad remain |
| unconnected. |
| |
| "sky130_ef_io" is open source copyright 2020 efabless, Inc. |
| Released under Apache 2.0 license |
| |
| NOTES: |
| ------------------- |
| Copy these .mag sources to open_pdks/sky130/custom/sky130_fd_io/mag/ |
| Generate GDS: |
| load sky130_ef_io |
| cif *hier write disable ;# there are no interactions |
| gds library true ;# don't write top-level cell |
| gds addendum true ;# don't write readonly cells |
| gds write sky130_ef_io |
| |
| and copy sky130_fd_io.gds to open_pdks/sky130/custom/sky130_fd_io/gds/. |
| |
| For LEF views, use |
| lef write -hide |
| and copy the resulting file to open_pdks/sky130/custom/sky130_fd_io/lef/. |
| ***BUT*** Some of the views need editing: |
| (1) Move m4 obstruction in com_slice_Xum from 93.365 to 173.75 so that |
| the area is empty for placing subcells in this area. |
| (2) Fix non-manhattan geometry in the corner of the corner cell. |
| (3) Erase labels on non-Manhattan shapes in sky130_fd_io__top_xres4v2 |
| before running "lef write -hide". |
| |
| These two actions have been codified into the following scripts: |
| generate_gds_lib.sh |
| generate_lef_views.sh |
| |
| |
| MODIFICATIONS: |
| ------------------- |
| 3/30/2021: Corrected the power pad layouts to differentiate between |
| the pad and the core (which are different nets). Text |
| "_PAD" added to the net on the pad, and port numbers |
| modified to match the corrected CDL netlists in open_pdks. |
| Rewriting GDS with the most recent magic techfile also |
| corrects the port/text layer:purpose pairs. |
| |
| 5/28/2021: Added power cell with extra-wide metal3 for the "caravan" |
| project. |
| |
| 6/16/2021: Fixed the mix-up between the "clamped" and "clamped2" pads. |
| To be consistent with the verilog and SPICE, the .mag, .lef, |
| and .gds views all need to have the names "clamped" and |
| "clamped2" swapped. |
| |
| 6/24/2021: Fixed cell top_power_hvc, which had a Y offset of -47um. |
| |
| 10/28/2021: Corrected an offset overlay on sky130_ef_io__vdda_hvc_pad. |