Filler Cells:
Filling 100% of the area with regular cells are generally impossible. We need spaces to improve the placement and routing. Once we complete the routing & achieve the timing closure, we may need to fill the empty spaces with filler cells for the following purpose.
- To reduce the DRC Violations created by the base(NWell, PPlus & NPlus) layers.
- Power Rail connection continuity.
Filler Cells doesn't have functionality. They have power rails, Nwell, PPlus and NPlus layers only. If we want to do any ECO's, then the filler cells can be deleted and the empty spaces can be utilized.
Decap Cells:
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