82801CA Datasheet, PDF (349/521 Pages) Intel Corporation – I/O Controller Hub 3-S (ICH3-S)

LPC I/F Bridge Registers (D31:F0)
9.8.3.14
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
1
0
Description
Reserved.
ADLIB_ACT_STS—R/WC. Ad-Lib.
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.
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_ACT_STS—R/WC. MIDI.
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_ACT_STS—R/WC. Audio (Sound Blaster “OR’d” 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.
PIRQDH_ACT_STS—R/WC. PIRQ[D or H].
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.
PIRQCG_ACT_STS—R/WC. PIRQ[C or G].
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.
PIRQBF_ACT_STS—R/WC. PIRQ[B or F].
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.
PIRQAE_ACT_STS—R/WC. PIRQ[A or E].
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.
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.
IDES1_ACT_STS—R/WC. IDE Secondary Drive 1.
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.
IDES0_ACT_STS—R/WC. IDE Secondary Drive 0.
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.
IDEP1_ACT_STS—R/WC. IDE Primary Drive 1.
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.
IDEP0_ACT_STS—R/WC. IDE Primary Drive 0.
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.
Intel^® 82801CA ICH3-S Datasheet
349