82371AB (PIIX4)
E
124
4/9/97 2:23 PM PIIX4aDS
INTEL CONFIDENTIAL
(until publication date)
PRELIMINARY
Bit
Description
23
Reserved.
22:21
LPT DMA select (LPT_DMA_SEL)—R/W.
Selects the active DACK signal used to reload the idle
timer for device 8 (parallel port). Enabled by RES_EN_DEV8 bit.
Bits[22:21]
DACK Signal
00
DACK0
01
DACK1
10
DACK3
11
Reserved
20
Device 11 IRQ 12 Enable (IRQ12_EN_DEV11)—R/W.
1=Enable an asserted IRQ12/M signal
(mouse activity) to generate a device 11 (user interface) decode event. 0=Disable.
19
Device 11 IRQ1 Enable (IRQ1_EN_DEV11)—R/W.
1=Enable an asserted IRQ1 signal (keyboard
activity) to generate a device 11 (user interface) decode event. 0=Disable.
18
LPT Port Enable (LPT_MON_EN)—R/W.
1=Enable accesses to parallel port address range
(LPT_DEC_SEL) to generate a device 8 (parallel port) decode event. 0=Disable.
17
LPT DMA Monitor Enable (RES_EN_DEV8)—R/W.
1=Enable the selected DACKs
(LPT_DMA_SEL) to generate a device 8 (parallel port) decode event. 0=Disable.
16
Serial Port B Monitor Enable (SB_MON_EN)—R/W.
1=Enable accesses to serial port address
range (COMB_DEC_SEL) to generate a device 7 (serial port B) decode event. 0=Disable.
15
Reserved.
14
Serial Port A Monitor Enable (SA_MON_EN)—R/W.
1=Enable accesses to serial port address
range (COMA_DEC_SEL) to generate a device 6 (serial port A) decode event. 0=Disable.
13
Reserved.
12
Floppy Disk Controller Monitor Enable (FDC_MON_EN)—R/W.
1=Enable accesses to floppy
disk controller address range (FDC_DEC_SEL) to generate a device 5 (floppy controller) decode
event. 0=Disable.
11
FDC DMA Monitor Enable (RES_EN_DEV5)—R/W.
1=Enable DACK2# to generate a device 5
(floppy controller) reload event. 0=Disable.
10:6
Reserved
.
5
DACK7 Enable (DACK7_EN_DEV4)—R/W.
1=Enable DACK7# to generate a device 4
(audio controller) reload event. 0=Disable.
4
DACK6 Enable (DACK6_EN_DEV4)—R/W.
1=Enable DACK6# to generate a device 4
(audio controller) reload event. 0=Disable.
3
DACK5 Enable (DACK5_EN_DEV4)—R/W.
1=Enable DACK5# to generate a device 4
(audio controller) reload event. 0=Disable.
2
DACK3 Enable (DACK3_EN_DEV4)—R/W.
1=Enable DACK4# to generate a device 4
(audio controller) reload event. 0=Disable.
1
DACK1 Enable (DACK1_EN_DEV4)—R/W.
1=Enable DACK1# to generate a device 4
(audio controller) reload event. 0=Disable.
0
DACK0 Enable (DACK0_EN_DEV4)—R/W.
1=Enable DACK0# to generate a device 4
(audio controller) reload event. 0=Disable.