can any one explain me what is a prBoundary

[kapilsn]

prBoundary

what is a prBoundary

 

[JoannesPaulus]

The prBoundary layer indicates the cell's edges (or boundaries). It is not a physical layer and it is used - for example - for tiling cells together.

 

[kapilsn]

The prBoundary layer indicates the cell's edges (or boundaries). It is not a physical layer and it is used - for example - for tiling cells together.

But Analog cells are never abutted together .then why do we pur a prBoundary over its extent?

 

[erikl]

But Analog cells are never abutted together .then why do we pur a prBoundary over its extent?

Analog cells' prBoundary should overlap the outermost guardRing by (at least) half of the spacing rule. In such case, all cells can be abutted.

 

[JoannesPaulus]

...moreover, it is good layout practice...

 

[oermens]

pr=place&route. used by cadence chip assembly router. anything in prBoundary will be routed by CCAR.

 

[Goldeneagle]

The prBoundary layer indicates the cell's edges (or boundaries). It is not a physical layer and it is used - for example - for tiling cells together.

But Analog cells are never abutted together .then why do we pur a prBoundary over its extent?

Well analog cells would be definitely used as macros at the top level.. prBoundary defines the boundary for the cell/macro.

 

[kumar_eee]

The "prBoundary" layer is recognized as the boundary for the cell. Some layers (PP,NP & NWELL) may go beyound the cell boundary as they are all can be merged with other cells. So prBoundary layer is called cell boundary layer.