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Final Steps

Parasitic Extraction​

warning

OpenLANE does not come with a native SPEF (Standard Parasitic Exchange Format) extractor. You must use a separate external tool provided in the work/tools/ directory.

Steps for SPEF Extraction​

  1. Navigate to the Extraction Tool Directory:

    cd /home/vsduser/Desktop/work/tools/SPEF_EXTRACTOR

  2. Review Available Files:

    • Inside this directory, you will find:
      • A Python script: main.py
      • Required LEF and DEF files

  3. Run the Python Script to Generate SPEF:

    python3 main.py \
      /home/vsduser/work/tools/openlane_working_dir/openlane/designs/picorv32a/runs/26-03_05-49/tmp/merged.lef \
      /home/vsduser/work/tools/openlane_working_dir/openlane/designs/picorv32a/runs/26-03_05-49/tmp/routing/picorv32a.def

    Result: A .spef file is generated and saved in the same directory as the .def: home/vsduser/work/tools/openlane_working_dir/openlane/designs/picorv32a/runs/26-03_05-49/tmp/routing/

Final Stage: GDSII Generation for Fabrication​

After parasitic extraction, the final fabrication-ready file is the GDSII.

Export GDSII using Magic​

  1. Use run_magic to stream the GDSII
  2. Generated GDSII File Location: runs/26-03_05-49/results/magic/picorv32a.gds
  3. Read the GDSII in Magic:
    1. You can view and verify the layout by opening the .gds file in the Magic GUI.