welltap and filler cell

[p_shinde]

welltap

Hello,

Can anyone please comment on the difference between welltap cells and filler cells used in PnR?

Thanks,
Prasad

 

[useless_skew]

filler cell

Well taps are placed at regular intervals to provided bias to the N-well.
There is a constant voltage in the N-well since the well taps placed at regular intervals maintain the potential.

Filler cells provided the rail connectivity. If there is a vacant space between two standard cells, a filler cell can be placed between them to connect their power rails.

Correct me if I am wrong.

Thanks.

 

[vlsitechnology]

I am not sure about Well tap cells But regarding Filler cells useless_skew is correct........

 

[iwpia50s]

useless_skew is correct on both points.

 

[p_shinde]

Thanks very much for all of u