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T8300 Datasheet(PDF) 11 Page - Intel Corporation

Part # T8300
Description  Core2 Duo Processor and Core2 Extreme Processor on 45-nm Process
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Manufacturer  INTEL [Intel Corporation]
Direct Link  http://www.intel.com
Logo INTEL - Intel Corporation

T8300 Datasheet(HTML) 11 Page - Intel Corporation

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Datasheet
11
Low Power Features
2
Low Power Features
2.1
Clock Control and Low-Power States
The 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, C4, Intel®
Enhanced Deeper Sleep, and Intel Deep Power-Down low-power states. When both
cores coincide in a common core low-power state, the central power management logic
ensures the entire processor enters the respective package low-power state by
initiating a P_LVLx (P_LVL2, P_LVL3, P_LVL4, P_LVL5,P_LVL6) I/O read to the (G)MCH.
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 P_LVLx I/O Monitor address does
not need to be set up 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 a core encounters a chipset break event while STPCLK# is asserted, it then asserts
the PBE# output signal. Assertion of PBE# when STPCLK# is asserted indicates to the
system logic that individual cores should return to the C0 state and the processor
should return to the Normal state.
Figure 1 shows the core low-power states and Figure 2 shows the package low-power
states for the processor. Table 1 maps the core low-power states to package low-power
states.


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