The Unabridged Pentium 4 IA32 Processor Genealogy

Enhanced Power Management Characteristics

Background

For background on the power conservation states available in earlier IA32 processors (including the Pentium® 4), refer to “Pentium® II Power Management Features” on page 683.

Entry to the Deep Sleep State

On the Pentium® 4 and earlier processors, the Deep Sleep state is entered (from the Sleep state) if the chipset causes the system board clock generator to turn off the BCLK to the processor (see Figure 58-1 on page 1431).

Figure 58-1. Power Conservation States Flowchart in a Pentium® 4 Processor

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Refer to Figure 58-2 on page 1432. The chipset can transition the Pentium® ...