OpenROAD synthesis complete with fake rams on nangate45

vlsi/example-vlsi-nangate45

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+#!/usr/bin/env python3
+import os
+
+import hammer_vlsi
+from hammer_vlsi import CLIDriver, HammerToolHookAction
+
+from typing import Dict, Callable, Optional, List
+
+def example_place_tap_cells(x: hammer_vlsi.HammerTool) -> bool:
+    x.append("")
+    return True
+
+def example_add_fillers(x: hammer_vlsi.HammerTool) -> bool:
+    x.append("")
+    return True
+
+class ExampleDriver(CLIDriver):
+    def get_extra_par_hooks(self) -> List[HammerToolHookAction]:
+        extra_hooks = [
+            # make_pre_insertion_hook will execute the custom hook before the specified step
+            hammer_vlsi.HammerTool.make_pre_insertion_hook("route_design", example_add_fillers),
+
+            # make_replacement_hook will replace the specified step with a custom hook
+            hammer_vlsi.HammerTool.make_replacement_hook("place_tap_cells", example_place_tap_cells),
+        ]
+        return extra_hooks 
+
+if __name__ == '__main__':
+    ExampleDriver().main()