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AC82GL40-SLB95 Datasheet(PDF) 11 Page - Intel Corporation |
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AC82GL40-SLB95 Datasheet(HTML) 11 Page - Intel Corporation |
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11 / 98 page  Datasheet 11 Low Power Features 2 Low Power Features 2.1 Clock Control and Low Power States The processor supports the C1/AutoHALT, C1/MWAIT, C2, C3 and some support the C4 core low-power states, along with their corresponding package-level states for power management. See Chapter 3 to see if C4 is supported. These package states include Normal, Stop Grant, Stop Grant Snoop, Sleep, and Deep Sleep. The processor’s central power management logic enters a package low-power state by initiating a P_LVLx (P_LVL2, P_LVL3, P_LVL4) I/O read to the (G)MCH. Figure 1 shows the package-level low-power states and Figure 2 shows the core low-power states. Refer to Table 1 for a mapping of core low-power states to package low-power states. The processor implements two software interfaces for requesting low-power states: MWAIT instruction extensions with sub-state hints and P_LVLx reads to the ACPI P_BLK register block mapped in the processor’s I/O address space. The P_LVLx I/O reads are converted to equivalent MWAIT C-state requests inside the processor and do not directly result in I/O reads on the processor FSB. The monitor address does not need to be setup before using the P_LVLx I/O read interface. The sub-state hints used for each P_LVLx read can be configured through the IA32_MISC_ENABLES Model Specific Register (MSR). If the processor encounters a chipset break event while STPCLK# is asserted, it asserts the PBE# output signal. Assertion of PBE# when STPCLK# is asserted indicates to system logic that the processor should return to the Normal state. NOTE: AutoHALT or MWAIT/C1 Table 1. Coordination of Core-Level Low-Power States at the Package Level Core States Package States C0 Normal C1(1) Normal C2 Stop Grant C3 Deep Sleep C4 Deeper Sleep Figure 1. Package-Level Low-Power States Stop Grant Snoop Normal Stop Grant Deep Sleep STPCLK# asserted Snoop serviced Snoop occurs Deeper Sleep† Sleep SLP# asserted SLP# deasserted DPSLP# asserted DPSLP# deasserted DPRSTP# deasserted DPRSTP# asserted STPCLK# deasserted † — Deeper Sleep includes the Deeper Sleep state and Deep C4 sub-state |
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