User guide

ASUS P7P55D-E 2-21
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*
7 14 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 – – – – – – –
PCIEx16_2 shared – – – – – – –
PCIEx1_1 shared – – – – – –
PCIEx1_2 – shared – – – – –
PCIEx1_3 – – – shared – – – –
PCI_1 shared – – – – – – –
PCI_2 – shared – – – – – –
LAN_1 – – shared – – – –
USB 2.0 Controller 1 – – – – – – – shared
USB 2.0 Controller 2 shared – – – – – – –
USB 3.0 Controller shared
SATA Controller – – shared – – – – –
SATA 6G Controller (IO
Levelup disabled or set
to USB 3.0)
shared
SATA 6G Controller (IO
Levelup set to SATA6G)
shared
JMicron ATA Controller shared
1394 Controller – – shared – – – –
HD Audio – – – – – – shared –