Standard Cell Site, Placement Grid and Unit Tile

[Anjali0]

Can any one point out the difference between Standard Cell Site, Placement Grid and Unit Tile...??

All these r same or different...??

I got a definition: "The minimum Width and Height a cell that can occupy in the design"

But this definition will suite for which one???

 

[Prashanthanilm]

A Placement Grid is nothing but the boundary of the cell, which gets abutted during PNR.
A routing grid is the one where the pin/via placement are done.
In case of Zero offset, both are same .

I am not aware of Standard cell Site and Unit Tile

 

[rca]

Standard Cell Site & Unit Tile: is the minimum width of the small largest cell, generally the smallest filler. The terminology difference could comes from different backend tool (Astro-ICC versus SE-SOCEncounter).
Placement grid: the grid is generated by the backend tool based on the unit tile.