Filler cells

Fillers cells

• These cells are Physical only cells , there is no logical connection
• These cells are useful for Nwell continuity,Power continuity and Implantation layer in Design
• If N wells are Discontinuity DRC will Fill the Filler cells based on the gap 

What is the need of the Nwell continuity

• Nwells and implantation are continuous it is easier to foundry people to generate the mask 
• Mask is very costly

############### adding filler cells############################

• addFiller -cell {FILL1 FILL2 FILL4 FILL8 FILL16 FILL32} -prefix filler_cells