| # This directory contains a seal ring generator for SkyWater s8 using magic. |
| # Because the seal ring contains many layers that do not appear in standard |
| # layout editing, they are all specially implemented in the s8seal_ring.tech |
| # file in this directory. |
| # |
| # An example seal ring was generated by SkyWater and imported using magic's |
| # gdsquery.sh script. It was then hand-edited to contain only the bottom |
| # quarter. Then it was saved in .mag databases. |
| # |
| # The generator script s8_gen_sealring.py calls magic using the s8seal_ring.tech |
| # file, and automatically modifies the geometry to stretch to the half width |
| # and height of the specified dimensions. Then the lower-left cells are |
| # copied and folded over the centerline to make the complete seal ring. |
| # The seal ring is then written out in GDS format. Then a simplified magic |
| # view is generated in the usual user-facing s8 technology file, with the |
| # GDS_FILE property pointing to the seal ring GDS. This layout and GDS can |
| # then be imported into a layout. |
| # |
| # Usage: |
| # |
| # s8_gen_sealring.py width height target_dir [-force] [-outer] |
| # |
| # Where: |
| # width = the full-chip layout width |
| # height = the full-chip layout height |
| # target_dir = location of the full-chip layout |
| # |
| # -force = overwrite existing files in the target directory |
| # -outer = width and height represent the seal ring outer edge, not the chip area |
| # |
| # Results: |
| # Files advSeal_6u_gen.mag and advSeal_6um_gen.gds are generated and placed in |
| # target_dir. advSeal_6u_gen.mag is an "abstract" view that represents the |
| # seal ring in diffusion and the nikon cross in metal1, and references |
| # the advSeal_6um_gen.gds file in the same directory as a GDS_FILE property. |
| # |
| |
