How a cell delay characterization is related to endcaps/fillers

[varunreddytrml]

Can any one explain why we add end caps? and how is it related to cell characterization ??

 

[nisshith]

end caps are placed at end of the rows for well tie off requirements

 

[thebraveheartomar]

then waht the benefit behind adding it to my design?

 

[Simranjeet Singh]

@nisshith: Can u please explain in more detail?

 

[nisshith]

at end of every std. cell row we need to tie N-well with VSS and PWell with Vdd. for this purpose end cap cells are used.

 

[pavanks]

During IC manufacturing the end of row will not have the proper diffusion required for a transistor to perform according to that PVT.
So they just put end of row cells so that there is no logic sitting there.