What is congestion???
If the no. of routing tracks available
for routing in a one particular area is less than the required routing tracks
then the area said to be congested. There will be a limit for no. of nets that
can be routed through particular area.
Reasons for congestion
- High standard cell density in small area,
- Placement of standard cells near macros,
- High pin density at the edge of macros
- Bad floorplan
- During IO optimization tool does buffering, so lot of cells placed in the core area.
