Specification Sheet

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Power Management

76 Datasheet, Volume 1 of 2

4.4 PCI Express* Power Management

• Active power management support using L1 state.

• All inputs and outputs disabled in L2/L3 Ready state.

Note: Processor PEG-PCIe interface does not support Hot-Plug.

Hot Plug like* is only supported at Processor PEG-PCIe using Thunderbolt Device.

* Turning Thunderbolt™ power on and Off electrically RTD3 Like

4.5 Direct Media Interface (DMI) Power Management

Note: Active power management support using L1 state.

4.6 Processor Graphics Power Management

4.6.1 Memory Power Savings Technologies

4.6.1.1 Intel

Rapid Memory Power Management (Intel

RMPM)

Intel

Rapid Memory Power Management (Intel

RMPM) conditionally places memory

into self-refresh when the processor is in package C3 or deeper power state to allow

the system to remain in the deeper power states longer for memory not reserved for

graphics memory. Intel RMPM functionality depends on graphics/display state (relevant

only when processor graphics is being used), as well as memory traffic patterns

generated by other connected I/O devices.

4.6.1.2 Intel

Smart 2D Display Technology (Intel

S2DDT)

Intel S2DDT reduces display refresh memory traffic by reducing memory reads

required for display refresh. Power consumption is reduced by less accesses to the IMC.

Intel S2DDT is only enabled in single pipe mode.

Table 4-9. Package C-States with PCIe* Link States Dependencies

PEG/DMI L-State Description Package C-State

DMI L1 Higher latency, lower power “standby” state PC6-PC8

PEG

L1, L2,

Disabled,

NDA (no

device

attached)

L1- Higher latency, lower power “standby” state

L2 – Auxiliary-powered Link, deep-energy-saving

state.

Disabled - The intent of the Disabled state is to

allow a configured Link to be disabled until directed

or Electrical Idle is exited (i.e., due to a hot removal

and insertion) after entering Disabled.

NDA- no physical device is attached on PEG port

PC6-PC7

PEG

L2, Disabled,