82801FB Datasheet, PDF (615/786 Pages) Intel Corporation – Intel I/O Controller Hub 6 (ICH6) Family

AC ’97 Modem Controller Registers (D30:F3)
17.1.19
PCS—Power Management Control and Status Register
(Modem—D30:F3)
Address Offset:
Default Value:
Lockable:
54h
0000h
No
Attribute:
Size:
Power Well:
This register is not affected by the D3_HOT to D0 transition.
R/W, R/WC
16 bits
Resume
Bit
Description
PME Status (PMES) — R/WC.
15 ^{0 = Software clears this bit by writing a 1 to it.}
1 = This bit is set when the AC ’97 controller would normally assert the PME# signal independent of
the state of the PME_En bit. This bit resides in the resume well.
14:9 Reserved — RO.
PME Enable (PMEE) — R/W.
8 ^{0 = Disable.}
1 = Enable. When set, and if corresponding PMES is also set, the AC '97 controller sets the
AC97_STS bit in the GPE0_STS register
7:2 Reserved — RO.
Power State (PS) — R/W. 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
1:0 _{11 = D3HOT state}
When in the D3_HOT state, the AC ’97 controller’s configuration space is available, but the I/O and
memory spaces are not. Additionally, interrupts are blocked.
If 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.
Intel^® I/O Controller Hub 6 (ICH6) Family Datasheet
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