82801DB Datasheet, PDF (369/587 Pages) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)

LPC Interface Bridge Registers (D31:F0)
9.8.3.15
Bit
Description
IDES0_ACT_STS — R/WC. IDE Secondary Drive 0.
2 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.
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 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.
DEVTRAP_EN— Device Trap Enable Register
I/O Address:
Default Value
Lockable:
Power Well:
PMBASE +48h
0000h
No
Core
Attribute:
Size:
Usage:
R/W
16 bit
Legacy Only
This register enables the individual trap ranges to generate an SMI# when the corresponding status
bit in the DEVACT_STS register is set. When a range is enabled, I/O cycles associated with that
range will not be forwarded to LPC or IDE.
Bit
Description
15:14 Reserved
ADLIB_TRP_EN — R/W. Ad-Lib.
13 0 = Disable.
1 = Enable.
KBC_TRP_EN — R/W. KBC (60/64h).
12 0 = Disable.
1 = Enable.
MIDI_TRP_EN — R/W. MIDI.
11 0 = Disable.
1 = Enable.
AUDIO_TRP_EN — R/W. Audio (Sound Blaster “OR’d” with MSS).
10 0 = Disable.
1 = Enable.
9:6 Reserved
LEG_IO_TRP_EN — R/W. Parallel Port, Serial Port 1, Serial Port 2, Floppy Disk controller.
5 0 = Disable.
1 = Enable.
4 Reserved
IDES1_TRP_EN — R/W. IDE Secondary Drive 1.
3 0 = Disable.
1 = Enable.
Intel^® 82801DB ICH4 Datasheet
369