feat: add a simple fill generator

Author: htfab

Diff for: .github/workflows/gds.yaml

@@ -57,6 +57,11 @@ jobs:
         run: |
           make
 
+      - name: Generate fill
+        run: |
+          pip install klayout
+          scripts/add-fill.py
+
       - name: Upload flow results
         uses: actions/upload-artifact@v4
         if: always()
@@ -123,7 +128,7 @@ jobs:
 
       - name: Run DRC
         run: |
-          klayout -b -r ./IHP-Open-PDK/ihp-sg13g2/libs.tech/klayout/tech/drc/sg13g2_minimal.lydrc -rd cell=tt_top -rd report_file=sg13g2_minimal.lyrdb ./results/ihp-sg13g2/tt-chip/base/6_final.gds
+          klayout -b -r ./IHP-Open-PDK/ihp-sg13g2/libs.tech/klayout/tech/drc/sg13g2_minimal.lydrc -rd cell=tt_top -rd report_file=sg13g2_minimal.lyrdb ./results/ihp-sg13g2/tt-chip/base/6_final_fill.gds
 
       - name: Upload DRC results
         uses: actions/upload-artifact@v4
@@ -163,7 +168,7 @@ jobs:
 
       - name: Run DRC
         run: |
-          klayout -b -r ./IHP-Open-PDK/ihp-sg13g2/libs.tech/klayout/tech/drc/sg13g2_maximal.lydrc -rd cell=tt_top -rd report_file=sg13g2_maximal.lyrdb ./results/ihp-sg13g2/tt-chip/base/6_final.gds
+          klayout -b -r ./IHP-Open-PDK/ihp-sg13g2/libs.tech/klayout/tech/drc/sg13g2_maximal.lydrc -rd cell=tt_top -rd report_file=sg13g2_maximal.lyrdb ./results/ihp-sg13g2/tt-chip/base/6_final_fill.gds
 
       - name: Upload DRC results
         uses: actions/upload-artifact@v4

Diff for: scripts/add-fill.py

@@ -0,0 +1,50 @@
+#!/usr/bin/env python3
+
+# simple fill generator inspired by https://github.com/IHP-GmbH/IHP-Open-DesignLib/tree/main/U_Hawaii_EE628_Spring_2024
+
+import pya
+
+results_dir = "results/ihp-sg13g2/tt-chip/base"
+input_gds = f"{results_dir}/6_final.gds"
+output_gds = f"{results_dir}/6_final_fill.gds"
+
+die_size = (2200, 2200)
+die_margin = 36
+fill_grid = 6
+fill_spacing = 6
+fill_groups = [
+    [("Activ", (1, 0), 4),
+    ("GatPoly", (5, 0), 4),
+    ("NWell", (31, 0), 5)],
+    [("Metal1", (8, 0), 4)],
+    [("Metal2", (10, 0), 4)],
+    [("Metal3", (30, 0), 3)],
+    [("Metal4", (50, 0), 3)],
+    [("Metal5", (67, 0), 2)],
+]
+
+layout = pya.Layout()
+layout.read(input_gds)
+top = layout.top_cell()
+u = round(1/layout.dbu)
+
+fill_box = pya.Box(die_margin*u, die_margin*u, (die_size[0]-die_margin)*u, (die_size[1]-die_margin)*u)
+shift_box = pya.Box(-fill_grid*u//2, -fill_grid*u//2, (fill_grid*u+1)//2, (fill_grid*u+1)//2)
+fill_margin = pya.Vector(fill_spacing*u, fill_spacing*u)
+fill_origin = pya.Point(0, 0)
+
+for fill_layers in fill_groups:
+    layer_list = [layer_name for layer_name, *_ in fill_layers]
+    print(f"Generating fill for {' & '.join(layer_list)}...")
+    cell_index = layout.add_cell(f"FILL_{layer_list[0]}")
+    cell_obj = layout.cell(cell_index)
+    fill_region = pya.Region(fill_box)
+    for layer_name, (layer, datatype), size in fill_layers:
+        layer_index = layout.layer(layer, datatype)
+        cell_obj.shapes(layer_index).insert(pya.Box(-size*u//2, -size*u//2, (size*u+1)//2, (size*u+1)//2))
+        exclude_region = pya.Region(top.begin_shapes_rec(layer_index))
+        fill_region -= exclude_region
+    top.fill_region(fill_region, cell_index, shift_box, fill_origin, fill_region, fill_margin, None)
+
+layout.write(output_gds)
+