2-20
Chapter 2: Hardware information
Chapter 2
2.5.3
Interrupt assignments
Standard interrupt assignments
* These IRQs are usually available for PCI devices.
IRQ
Priority Standard function
0
1
System Timer
1
2
Keyboard Controller
2
–
Redirect to IRQ#9
4
12
Communications Port (COM1)*
5
13
IRQ Holder for PCI Steering*
6
14
Reserved
7
15
Reserved
8
3
System CMOS/Real Time Clock
9
4
IRQ Holder for PCI Steering*
10
5
IRQ Holder for PCI Steering*
11
6
IRQ Holder for PCI Steering*
12
7
Reserved
13
8
Numeric Data Processor
14
9
Primary IDE Channel
IRQ assignments for this motherboard
A
B
C
D
E
F
G
H
PCIEx16_1
shared
–
–
–
–
–
–
–
PCIEx1_1
–
–
shared
–
–
–
–
–
PCI_1
shared
–
–
–
–
–
–
–
PCI_2
–
shared
–
–
–
–
–
–
LAN
–
–
–
shared
–
–
–
–
USB 2.0 Controller 1
–
–
–
–
–
–
–
shared
USB 2.0 Controller 2
shared
–
–
–
–
–
–
–
SATA Controller 1
–
–
shared
–
–
–
–
–
SATA Controller 2
–
–
–
–
–
shared
–
–
IDE
–
–
shared
–
–
–
–
–
Onboard VGA
shared
–
–
–
–
–
–
–
HD Audio
–
–
–
–
–
–
shared
–
Summary of Contents for P7H55 DVI
Page 1: ...Motherboard P7H55 M PRO ...
Page 14: ...xiv ...
Page 20: ...1 6 Chapter 1 Product Introduction Chapter 1 ...
Page 56: ...2 36 Chapter 2 Hardware information Chapter 2 ...
Page 96: ...3 40 Chapter 3 BIOS setup Chapter 3 ...
