82801BA Datasheet, PDF (338/498 Pages) Intel Corporation – Intel 82801BA I/O Controller Hub 2 (ICH2) and Intel 82801BAM I/O Controller Hub 2 Mobile

LPC Interface Bridge Registers (D31:F0)
9.8.3.16
DEVACT_STS—Device Activity Status Register
I/O Address:
Default Value:
Lockable:
Power Well:
PMBASE +44h
0000h
No
Core
Attribute:
Size:
Usage:
R/WC
16-bit
Legacy Only
This register is used in conjunction with the Periodic SMI# timer to detect any system activity for
legacy power management.
Bit
15:14
13
12
11
10
9
8
7
6
5
4
3
2
Description
Reserved
ADLIB Activity Status (ADLIB_ACT_STS)—R/WC.
0 = Indicates that there has been no access to this device’s I/O range.
1 = This device’s I/O range has been accessed. Clear this bit by writing a 1 to the bit location.
Keyboard Controller Activity Status (KBC_ACT_STS)—R/WC. KBC (60/64h).
0 = Indicates that there has been no access to this device’s I/O range.
1 = This device’s I/O range has been accessed. Clear this bit by writing a 1 to the bit location.
MIDI Activity Status (MIDI_ACT_STS)—R/WC.
0 = Indicates that there has been no access to this device’s I/O range.
1 = This device’s I/O range has been accessed. Clear this bit by writing a 1 to the bit location.
Audio Activity Status (AUDIO_ACT_STS)—R/WC. Audio (Sound Blaster “ORed” with MSS).
0 = Indicates that there has been no access to this device’s I/O range.
1 = This device’s I/O range has been accessed. Clear this bit by writing a 1 to the bit location.
PIRQ[D or H] Activity Status (PIRQDH_ACT_STS)—R/WC.
0 = The corresponding PCI interrupts have not been active.
1 = At least one of the corresponding PCI interrupts has been active. Clear this bit by writing a 1 to
the bit location.
PIRQ[C or G] Activity Status (PIRQCG_ACT_STS)—R/WC.
0 = The corresponding PCI interrupts have not been active.
1 = At least one of the corresponding PCI interrupts has been active. Clear this bit by writing a 1 to
the bit location.
PIRQ[B or F] Activity Status (PIRQBF_ACT_STS)—R/WC.
0 = The corresponding PCI interrupts have not been active.
1 = At least one of the corresponding PCI interrupts has been active. Clear this bit by writing a 1 to
the bit location.
PIRQ[A or E] Activity Status (PIRQAE_ACT_STS)—R/WC.
0 = The corresponding PCI interrupts have not been active.
1 = At least one of the corresponding PCI interrupts has been active. Clear this bit by writing a 1 to
the bit location.
Legacy Activity Status (LEG_ACT_STS)—R/WC. Parallel Port, Serial Port 1, Serial Port 2, Floppy
Disk Controller.
0 = Indicates that there has been no access to this device’s I/O range.
1 = This device’s I/O range has been accessed. Clear this bit by writing a 1 to the bit location.
Reserved.
IDE Secondary Drive 1 Activity Status (IDES1_ACT_STS)—R/WC.
0 = Indicates that there has been no access to this device’s I/O range.
1 = This device’s I/O range has been accessed. Clear this bit by writing a 1 to the bit location.
IDE Secondary Drive 0 Activity Status (IDES0_ACT_STS)—R/WC.
0 = Indicates that there has been no access to this device’s I/O range.
1 = This device’s I/O range has been accessed. Clear this bit by writing a 1 to the bit location.
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82801BA ICH2 and 82801BAM ICH2-M Datasheet