The following are the Control Parameters during Floorplan

**Aspect Ratio:**

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

**Width and Height:**

- Width
- Height
- Row/Core ratio

**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
- A(p) = Area occupied by Pads/ Pad fillers
- A(s) = Area occupied by Standard Cells

**Cell row utilization C(F) **of floorplan F is approximated using the following equation:

C(F) = A(s) / A(R -union(B, E, m, p))

- Where R= All cell rows
- B= All placement blockages
- E= Exclusive Regions