82801DB Datasheet, PDF (368/587 Pages) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)

LPC Interface 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
Description
15:14 Reserved
ADLIB_ACT_STS — R/WC. Ad-Lib.
13 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).
12 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.
11 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).
10 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].
9
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].
8
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].
7
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].
6
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.
5 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.
4 Reserved
IDES1_ACT_STS — R/WC. IDE Secondary Drive 1.
3 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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Intel^® 82801DB ICH4 Datasheet