Asus P3W P3W User Manual - Page 34

Assigning DMA Channels for ISA Cards, Audio Modem Riser AMR Slot - e upgrade

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3. HARDWARE SETUP 3.7.3 Assigning DMA Channels for ISA Cards Some ISA cards, both legacy and PnP, may also need to use a DMA (Direct Memory Access) channel. DMA assignments for this motherboard are handled the same way as the IRQ assignment process described earlier. To select a DMA channel, see PCI/ PNP ISA DMA Resource Exclusion in 4.4.3 PCI Configuration. NOTE: The onboard audio by default uses DMA1. IMPORTANT: To avoid conflicts, reserve the necessary IRQs and DMAs for legacy ISA cards (see PCI/PNP ISA IRQ Resource Exclusion and PCI/PNP DMA IRQ Resource Exclusion in 4.4.3 PCI Configuration). Choose Yes in IRQ xx Used By ISA and DMA x Used By ISA for those IRQs and DMAs you want to reserve). 3.7.4 Audio Modem Riser (AMR) Slot This connector supports a specially designed audio and/or modem card called an AMR. Main processing is done through software and controlled by the motherboard's Intel I/O Controller Hub (ICH). This provides an upgradeable audio and/or modem solution at an incredibly low cost. There are two types of AMR, one defined as primary and another defined as secondary. This motherboard uses the primary channel so that a secondary AMR can coexist without the need to disable the onboard CODEC. The motherboard's onboard CODEC must be disabled when using a primary AMR. NOTE: An AMR is not included with this motherboard. 3. H/W SETUP Expansion Cards 01 01 1 P3W ® P3W Audio Modem Riser (AMR) Connector 34 ASUS P3W User's Manual

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34
ASUS P3W User’s Manual
3. HARDWARE SETUP
3.7.3
Assigning DMA Channels for ISA Cards
Some ISA cards, both legacy and PnP, may also need to use a DMA (Direct Memory
Access) channel. DMA assignments for this motherboard are handled the same way
as the IRQ assignment process described earlier. To select a DMA channel, see
PCI/
PNP ISA DMA Resource Exclusion
in
4.4.3 PCI Configuration
.
NOTE:
The on-
board audio by default uses DMA1.
IMPORTANT:
To avoid conflicts, reserve the necessary IRQs and DMAs for
legacy ISA cards (see
PCI/PNP ISA IRQ Resource Exclusion
and
PCI/PNP
DMA IRQ Resource Exclusion
in
4.4.3 PCI Configuration
). Choose
Yes
in
IRQ xx Used By ISA
and
DMA x Used By ISA
for those IRQs and DMAs you
want to reserve).
3.7.4
Audio Modem Riser (AMR) Slot
This connector supports a specially designed audio and/or modem card called an
AMR. Main processing is done through software and controlled by the motherboard’s
Intel I/O Controller Hub (ICH). This provides an upgradeable audio and/or modem
solution at an incredibly low cost. There are two types of AMR, one defined as
primary and another defined as secondary. This motherboard uses the primary chan-
nel so that a secondary AMR can coexist without the need to disable the onboard
CODEC. The motherboard’s onboard CODEC must be disabled when using a pri-
mary AMR.
NOTE:
An AMR is not included with this motherboard.
1
0
1
0
1
®
P3W
P3W Audio Modem Riser (AMR) Connector
Expansion Cards
3. H/W SETUP