The Si2 Common Power Format, or CPF is a file format for specifying power-saving techniques early in the design process. In the design of integrated circuits, saving power is a primary goal, and designers are forced to use sophisticated techniques such as clock gating, multi-voltage logic, and turning off the power entirely to inactive blocks. These techniques require a consistent implementation in the design steps of logic design, implementation, and verification. For example, if multiple different power supplies are used, then logic synthesis must insert level shifters, place and route must deal with them correctly, and other tools such as static timing analysis and formal verification must understand these components. As power became an increasingly pressing concern, each tool independently added the features needed. Although this made it possible to build low power flows, it was difficult and error prone since the same information needed to be specified several times, in several formats, to many different tools. CPF was created as a common format that many tools can use to specify power-specific data, so that power intent only need be entered once and can be used consistently by all tools. The aim of CPF is to support an automated, power-aware design infrastructure.
Associated with CPF is the Power Forward Initiative (PFI), a group of companies that collaborate to drive low-power design methodology and have contributed to the development of the CPF v1.0 specification. PFI membership spans EDA, IP, library, foundry fabs, ASIC, IDM, and equipment companies. In March 2007, CPF v1.0 was contributed to the Silicon Integration Initiative (Si2) where it was ratified by Si2’s Low Power Coalition (LPC) as a Si2 standard. The LPC controls the ongoing evolution of the CPF v1.0 standard.
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