Intel 6300ESB Datasheet page 564

Table 482. Offset 54h: PCS—Power Management Control and Status Register
(Audio—D31:F5) (Sheet 2 of 2)
31
Device:
54h
Offset:
0000h
Default Value:
No
Lockable:
Bits Name
Power Management
8
Event Enable (PMEE)
7:2 Reserved
1:0 Power State (PS)
13.2 AC'97 Audio I/O Space (D31:F5)
The AC'97 I/O space includes Native Audio Bus Master Registers and Native Mixer
Registers. For the Intel
bits[1:0] of the TAG field (codec ID).
Audio Mixer I/O space may be accessed as a 16-bit field only since the data packet
length on
AC-link is a word. Any S/W access to the codec will be done as a 16-bit access starting
from the first active byte. In case no byte enables are active, the access will be done at
the first word of the qWord that contains the address of this request.
®
Intel 6300ESB I/O Controller Hub
DS
564
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 in to
this field, the write operation must complete normally.
However, the data is discarded and no state change occurs.
®
6300ESB ICH, the offsets are important as they will determine
5
Function:
Read/Write
16-bit
Size:
Resume
Order Number: 300641-004US
®
Intel 6300ESB ICH—13
Access
R/W
RO
R/W
November 2007