Intel 6300ESB Datasheet page 592

Table 515. Offset 54h: PCS—Power Management Control and Status Register
(Modem—D31:F6) (Sheet 2 of 2)
29
Device:
54h
Offset:
0000h
Default Value:
No
Lockable:
Bits Name
Power Management
8
Event Enable (PMEE)
7:2 Reserved
1:0 Power State (PS)
®
Intel 6300ESB I/O Controller Hub
DS
592
Attribute:
Power Well:
Description
When set, and if corresponding PMES is also set, the AC'97
controller sets the AC97_STS bit in the GPE0_STS register.
Reserved.
This field is used both to determine the current power state of
the AC'97 controller and to set a new power state. The values
are:
00 – D0 state
01 – not supported
10 – not supported
11 – D3 state
HOT
When in the D3 state, the AC'97 controller's configuration
HOT
space is available, but the I/O and memory spaces are not.
Additionally, interrupts are blocked.
When software attempts to write a value of 10b or 01b to this
field, the write operation must complete normally. However,
the data is discarded and no state change occurs.
5
Function:
Read/Write
16-bit
Size:
Resume
Order Number: 300641-004US
®
Intel 6300ESB ICH—14
Access
R/W
RO
R/W
November 2007