ETX-DC®/ System Resources
41
8.1.2
In APIC mode
IRQ #
Used For
Available
Comment
0
Timer0
No
1
Keyboard
No
2
Slave 8259
No
3
COM2
No
Note (1)
4
COM1
No
Note (1)
5
PCI/LPT2
Yes
Note (2)
6
Floppy Drive Controller
No
Note (1)
7
LPT1
No
Note (1)
8
RTC
No
9
SCI
No
System Control Interrupt (3)
10
COM3
Yes
Note (2)
11
COM4
Yes
Note (2)
12
PS/2 Mouse
No
Note (1)
13
FPU
No
14
IDE0
No
Note (4)
15
IDE1
No
Note (4)
16
PIRQ[A]
For PCI
PCI IRQ line 1 + Graphics cont HD Audio Cont
secondary IDE
17
PIRQ[B]
For PCI
PCI IRQ line 2 + AC97 Audio controller
18
PIRQ[C]
For PCI
PCI IRQ line 3 + USB UCHI controller #3 + SATA (native mode)
19
PIRQ[D]
For PCI
PCI IRQ line 4 + USB UCHI controller #2 + IDE (native mode)
20
PIRQ[E]
No
Lan Controller
21
PIRQ[F]
No
22
PIRQ[G]
No
23
PIRQ[H]
No
USB EHCI controller, USB UCHI controller #1
Note:
1 If the “Used For” device is disabled in setup, the corresponding interrupt is available for other devices.
2 Unavailable if baseboard is equipped with an I/O controller SMC FDC37C669, and the device is enabled in
setup. 3 Unavailable in Advanced Configuration and Power Interface (ACPI) mode. Used as System
Control Interrupt (SCI) in ACPI mode. Currently not free in Non-ACPI mode.
4 IRQs are available if IDE controller is either disabled in setup or if in Native IDE mode.
8.1.3
Direct Memory Access (DMA) Channels
DMA #
Used for
Available
Comment
0
No
1
No
2
FDC
No
If the “used-for” device is disabled in setup, the corresponding DMA channel is
available for other devices.
3
LPT
No
Unavailable if LPT is used in ECP mode.
4
Cascade
No
5
No
6
No
7
No
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