Goal and objectives of the Floor plan and its Evaluation

The goals of floor planning are to:

• defining the core area, aspect ratio .
• arrange the blocks on a chip.
• decide the location of the I/O pads.
• decide the location and number of the power pads.
• decide the type of power distribution
  

Floor planning control parameters like aspect ratio, core utilization are defined as follows:

Aspect Ratio =W/L

Core Utilization= Standard Cell Area +Macro cell area / (Row Area + Channel Area)
The percentage of core utilized by placed standard cell and macros.

Determines die size:
Core limited :Core logic determines the die size.
Pad limited :No of I/O pads determines the die size.Pad area is more than cell area.

We need to control the aspect ratio of our floor plan because we have to fit our chip into the die cavity (a fixed-size hole, usually square) inside a package

Evaluation of Floorplan
-a through away placement
-Estimate global route congestion