## Floorplan Control Parameters

The following are the Control Parameters during Floorplan

1. Aspect Ratio:

• Core Utilization
• Aspect ratio (H/W)
• Row/Core ratio

2.Width and Height:

• Width
• Height
• Row/Core ratio

1. Aspect Ratio (Ar):
Aspect ratio is the ratio between vertical routing resources to horizontal routing resources. If you specify a ratio of 1.00, the height and width are the same and therefore the core is a square. If you specify a ratio of 3.00, the height is three times the width.

Aspect Ratio(Ar) = Horizontal routing resource (H)/Vertical routing resource (V)

• Core Utilization (Cu): It indicates the amount of core area used for cell placement. The number is calculated as a ratio of the total cell area (for hard macros and standard cells or soft macro cells) to the core area. A core utilization of 0.8, for example, means that 80% of the core area is used for cell placement and 20 percent is available for routing.
Core Utilization(Cu) = Standard Cell area/(Row area + Channel area)

• Row to Core Ratio (Rcr): It indicates the amount of channel space to provide for routing between the cell rows. The smaller the number, the more space is left for routing. A value of 1.0 leaves no routing channel space.
Rcr = Row area / Core area (H x V)

• Total utilization T(F) of floorplan F is derived using the following equation:

T(F) = (A(m) + A(p) + A(s) ) / A

where A(m) = Area occupied by macros