System, method and apparatus for conserving power consumed by a system having a processor integrated circuit

摘要

A processor integrated circuit has at least one processor and two or more levels of cache memory. A first power connection provides power to the processor and lower level cache, which form a first power domain. The integrated circuit has a second power connection providing power to upper level cache of the circuit, forming a second power domain. There may be additional power connections to the integrated circuit, forming additional power domains, such as periphery or memory-interface power.