L7200 Просмотр технического описания (PDF) - Intel
Номер в каталоге
Компоненты Описание
Список матч
L7200 Datasheet PDF : 91 Pages
| |||
Low Power Features
2
2.1
Low Power Features
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.
Datasheet
11
Share Link: 