Intel i7-3920XM Extreme AW8063801009607 User Manual

Datasheet, Volume 2

183

Processor Configuration Registers 

1:0

RW

00b

Uncore

Power State (PS)
This field indicates the current power state of this device and can 

be used to set the device into a new power state. If software 

attempts to write an unsupported state to this field, write 

operation must complete normally on the bus, but the data is 

discarded and no state change occurs.
00 = D0
01 = D1 (Not supported in this device.)
10 = D2 (Not supported in this device.)
11 = D3
Support of D3cold does not require any special action. 
While in the D3hot state, this device can only act as the target of 

PCI configuration transactions (for power management control). 

This device also cannot generate interrupts or respond to MMR 

cycles in the D3 state. The device must return to the D0 state in 

order to be fully-functional. 
When the Power State is other than D0, the bridge will Master 

Abort (that is, not claim) any downstream cycles (with exception 

of type 0 configuration cycles). Consequently, these unclaimed 

cycles will go down DMI and come back up as Unsupported 

Requests, which the processor logs as Master Aborts in Device 0 

PCISTS[13]
There is no additional hardware functionality required to support 

these Power States.