ETX-CV
User’s Manual
Page 34
7.3
Interrupt Request (IRQ) Lines
PIC Mode
IRQ#
Typical Interrupt Resource
Connected to Pin
Available
0
Counter 0
N/A
No
1
Keyboard controller
N/A
No
2
Cascade interrupt from slave PIC
N/A
No
3
Serial Port 2 (COM2) / PCI
IRQ3 via SERIRQ
Note (1)
4
Serial Port 1 (COM1) / PCI
IRQ4 via SERIRQ
Note (1)
5
Parallel Port 2 (LPT2) / PCI
IRQ5 via SERIRQ
Note (1)
6
Floppy Drive Controller
IRQ6 via SERIRQ
No
7
Parallel Port 1 (LPT1) / PCI
IRQ7 via SERIRQ,
Note (1)
8
Real-time clock
N/A
No
9
SCI / PCI
IRQ9 via SERIRQ
Note (1)
10
PCI
IRQ10 via SERIRQ
Note (1)
11
PCI
IRQ11 via SERIRQ
Note (1)
12
PS/2 Mouse / PCI
IRQ12 via SERIRQ
Note (1)
13
Math Processor
N/A
No
14
Primary IDE controller / PCI
IRQ14 via SERIRQ
Note (1)
15
Secondary IDE controller / PCI
IRQ15 via SERIRQ
Note (1)
(1) These IRQs can be used for PCI devices when onboard device is disabled.
APIC Mode
IRQ#
Typical Interrupt Resource
Connected to Pin
Available
0
Counter 0
N/A
No
1
Keyboard controller
N/A
No
2
Cascade interrupt from slave PIC
N/A
No
3
Serial Port 2 (COM2) / PC
IRQ3 via SERIRQ
Note (1)
4
Serial Port 1 (COM1) / PCI
IRQ4 via SERIRQ
Note (1)
5
Parallel Port 2 (LPT2) / PCI
IRQ5 via SERIRQ
Note (1)
6
Floppy Drive Controller
IRQ6 via SERIRQ
No
7
Parallel Port 1 (LPT1) / PCI / ISA
IRQ7 via SERIRQ
Note (1)
8
Real-time clock
N/A
No
9
SCI / PCI
IRQ9 via SERIRQ
Note (1),
10
PCI
IRQ10 via SERIRQ
Note (1)
11
PCI
IRQ11 via SERIRQ
Note (1)
12
PS/2 Mouse / PCI
IRQ12 via SERIRQ
Note (1)
13
Math Processor
N/A
No
14
Primary IDE controller / PCI
IRQ14 via SERIRQ
Note (1)