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.