Unit of area in RTL Compiler

asiccadence

After compiling my design using RTL compiler targeting 45nm library, the tool gives me an area report as below:

   Type    Instances    Area    Area %
---------------------------------------
sequential      2237  19102.387   15.8
inverter        6982   9830.896    8.1
buffer           535   1255.847    1.0
logic          33180  91031.529   75.1
---------------------------------------
total          42934 121220.659  100.0

What is the unit of the Area column and what is the meaning of this area number?

Best Answer

The answers from Cadence forum:

If your library says the are of a buffer is 10 square units and your design has 2 buffers, RC should report an area of 20. A few things to keep in mind:

  • most libraries use square microns for units but some use their own reference unit which may or may not be documented in library

  • RC report cell area as well as area. area includes cell area and an estimate of net area. As mentioned before, the cell area is not estimated whereas net is.

http://www.cadence.com/Community/forums/p/25863/1322431.aspx#1322431

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