Base Layer and Dummy Fill Insertion
Dummy Fill is an analog fill utility available only at advanced nodes. Dummy fill cells are inserted in the empty spaces in each row without impacting the row size.
Before inserting dummy fill, ensure that:
- All active devices are placed in rows. Align the devices with matching concerns down the center of the rows for better symmetry.
- The rows do not include devices with different finger lengths.
- An empty row is maintained between devices with different lengths.
Depending on the placement that you have created, you might need to stretch the row region to create the required number of rows for the fill.
The second and third prerequisites are advanced node constraints that might differ depending on your particular PDK.
Transition and adjacent fill can be added even when poly trim layers do not exist in the technology file.
Use the options in the Base Layer and Dummy Fill form to insert dummy fill in your design.
Before running the command, select the instances for which dummy fill must be inserted. If no instances are selected, all instances that are currently placed within the PR boundary are selected for dummy fill insertion.
The options in the Base Layer and Dummy Fill form are the same as on the Fill tab of the Auto Device P&R assistant.
Related Topics
Fill Definitions for the Virtuoso Placer Flow
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