Reducing CPU and bus power when running in power-save modes
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United States of America Patent
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Jul 5, 2011
Grant Date -
Feb 7, 2008
app pub date -
Oct 2, 2007
filing date -
Mar 24, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A processing system includes a bus and a processor whose core is constrained to have one or more core clock signal frequencies no lower than a predetermined multiple of the lowest of one or more bus clock signal frequencies. In a power-save mode, the processor is able to generate one or more core clock signals at frequencies such that the lowest core clock signal frequency is lower than the predetermined multiple of the lowest of the one or more bus clock signal frequencies in performance mode. The processor is able to achieve this by generating the one or more bus clock signals so that the lowest of the bus clock signal frequencies in power-save mode is lower than the lowest of the bus clock signal frequencies in performance mode.
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