82371AB Datasheet, PDF (124/284 Pages) Intel Corporation – PCI-TO-ISA / IDE XCELERATOR PIIX4

82371AB (PIIX4)
E
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.
124
PRELIMINARY
4/9/97 2:23 PM PIIX4aDS
INTEL CONFIDENTIAL
(until publication date)