1  CPF  
  The Common Power Format is a standard promoted by the Low Power Coalition at Si2. CPF is also a TCL-based language that operates on specification objects and the design objects. A design object is a module, instance, net, pin or port as they appear in the RTL.
  The language can be used to express power design intent in terms of:
   - Power domains : From physical, logical and analysis point of view
   - Power logic : For example, level shifters and isolation logic
   - Power mode : State mode table and transitions

2  UPF
  The UPF specification is in ASCII format that can be used to specify low power directives that encompass all aspects during the design flow. The power specification provided in a UPF file can be used by simulation, synthesis, equivalence checking, physical design and physical verification.

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