82801BA Datasheet, PDF (235/498 Pages) Intel Corporation – Intel 82801BA I/O Controller Hub 2 (ICH2) and Intel 82801BAM I/O Controller Hub 2 Mobile

LAN Controller Registers (B1:D8:F0)
7.1.23
PMCSR—Power Management Control/Status Register
(LAN Controller—B1:D8:F0)
Offset Address: E0–E1h
Default Value: 0000h
Attribute:
Size:
RO, R/W, R/WC
16 bits
Bit
Description
15
14:13
12:9
8
7:5
4
3:2
1:0
PME Status—R/WC.
1 = Set upon occurrence of a wake-up event, independent of the state of the PME Enable bit.
0 = Software clears this bit by writing a 1 to the bit location. This also deasserts the PME# signal
and clears the PME status bit in the Power Management Driver Register. When the PME#
signal is enabled, the PME# signal reflects the state of the PME status bit.
Data Scale—RO. This field indicates the data register scaling factor. It equals 10b for registers zero
through eight and 00b for registers nine through fifteen, as selected by the "Data Select" field.
Data Select—R/W. This field is used to select which data is reported through the Data register and
Data Scale field.
PME Enable—R/W. This bit enables the ICH2’s integrated LAN controller to assert PME#.
1 = Enable PME# assertion when PME Status is set.
0 = The device will not assert PME#.
Reserved.
Dynamic Data—RO. Hardwired to 0 to indicate that the device does not support the ability to
monitor the power consumption dynamically.
Reserved.
Power State—R/W. This 2-bit field is used to determine the current power state of the integrated
LAN Controller, and to put it into a new power state. The definition of the field values is as follows:
00 = D0
01 = D1
10 = D2
11 = D3
7.1.24
DATA—Data Register (LAN Controller—B1:D8:F0)
Offset Address: E3h
Default Value: 00h
Attribute:
Size:
RO
8 bits
Bit
Description
7:0 Data Value. State dependent power consumption and heat dissipation data.
Note:
The data register is an 8-bit read only register that provides a mechanism for the ICH2’s integrated
LAN Controller to report state dependent maximum power consumption and heat dissipation. The
value reported in this register depends on the value written to the Data Select field in the PMCSR
register. The power measurements defined in this register have a dynamic range of 0 to 2.55 W
with 0.01 W resolution, scaled according to the Data Scale field in the PMCSR. The structure of
the Data Register is given in Table 7-3.
82801BA ICH2 and 82801BAM ICH2-M Datasheet
7-9