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Core Filler & Metal Filler

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When a design is placed in a placer, there are gaps between cells. Core filler cells fill in the gaps so the nwell or pwell is continuous. There is no such thing as a metal filler cell, but metal fill is usually to fill in empty space on a metal layer to get the metal coverage to requirement specified by the fab. There are two purposes for this, 1) To make the planarization layer as smooth as possible; 2) To increase the stiffness of the die so it does not flex, thus causing defects.
 

based on my experience......following are the answers

1) core filler cells: Sometimes in std cell layout there are no taps' to make up to that there are filler cells which have taps in them. These are inserted in the rows based on the design rule requirements.

2) Metal filler cells: Sometimes to make up for the metal density rules; special spacers/fillers need to created and inserted in the rows based on the requirement.

Not only metal this can be applicable for all layers.
Hope this helps.

Thanks!
 

R u sure that filler cells are same as Core fillers...................If ur sure then these answers are correct....

Bye
 

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