31:16

0h

RO

Reserved

15

0h

RW/1C/V

Power Management Event Status (PMES)

Not used.
No PME from D3cold.

14:13

0h

RO

Data Scale (DS)

Not used

12:9

0h

RO

Data Scale (DSEL)

Not used

8

0h

RO

Power Management Event Enable (PMEEN)

Power Management Event Enable

7:4

0h

RO

Reserved

3

1h

RO

No Soft Reset (NSR)

This read-only bit indicates that the device does not lose internal state on a D3hot to D0 transition. This means:

• The internal state is not reset on a D3 (D3hot actually) to D0 transition and no additional operating system intervention is required to preserve the state
  
• A transition from D3 to D0 will NOT cause the IP to return to D0uninitialized (see section ?? on Iunit device power states)
  
• The Iunit+PUnit will restore the state of the IP configuration and MMIO registers.

2

0h

RO

Reserved

1:0

0h

RW/V

Power State (PS)

Power management is implemented by writing to control registers in the PUNIT. This field may be programmed by the software driver, but no action is taken based on writing to this field.