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L7400 Datasheet(PDF) 11 Page - Intel Corporation |
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L7400 Datasheet(HTML) 11 Page - Intel Corporation |
11 / 91 page Datasheet 11 Low Power Features 2 Low Power Features 2.1 Clock Control and Low Power States The Intel Core 2 Duo mobile processor supports low power states both at the individual core level and the package level for optimal power management. A core may independently enter the C1/AutoHALT, C1/MWAIT, C2, C3, and C4 low power states. Refer to Figure 1 for a visual representation of the core low power states for the processor. When both cores coincide in a common core low power state, the central power management logic ensures the entire Intel Core 2 Duo mobile processor enters the respective package low power state by initiating a P_LVLx (P_LVL2, P_LVL3, and P_LVL4) I/O read to the Intel 945GM/GT/GMS/PM and 940GML Express Chipset family. Package low power states include Normal, Stop Grant, Stop Grant Snoop, Sleep, Deep Sleep, and Deeper Sleep. Refer to Figure 2 for a visual representation of the package low power states for the Intel Core 2 Duo mobile processor and to Table 1 for a mapping of core low power states to package low power states. The Intel Core 2 Duo mobile 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 a software programmable Model Specific Register (MSR). If a core encounters a chipset break event while STPCLK# is asserted, then it asserts the PBE# output signal. Assertion of PBE# when STPCLK# is asserted indicates to system logic that individual cores should return to the C0 state and the Intel Core 2 Duo mobile processor should return to the Normal state. |
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