of switch logic and control signals - how are blocks switched on and off? Definition and verification of power modes (standby, sleep, etc.) Mode definitions Mode transition expressions History and controversy Cadence Design Systems designed the early versions of CPF, then contributed it to Si2. This was followed shortly by an alternative effort, the Unified Power Format or UPF, proposed as an IEEE standard as opposed to an Si2 standard. UPF has been driven mainly by Synopsys, Mentor Graphics and Magma. The technical differences between the two formats are relatively minor, but the political considerations are harder to overcome. Not surprisingly, the Cadence Low-Power Solution supported Si2’s CPF very early on, as well as UPF as it emerged; whereas the Synopsys, and Mentor Graphics offerings all support UPF. Magma supports both CPF and UPF. An attempt at convergence is taking place in the Low Power Coalition at Si2. References External links Download CPF specification. Computer file formats Power standards