Asus CROSSHAIR IV EXTREME, User Manual, Page: 50 / 172

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
PCIE_X16_1 shared – – – – – – –
PCI_1 – – – – shared – – –
PCIE_X8 / X1_2 – – – –
shared
(X8)
– –
shared
(X1)
PCI_2 – – – – – shared – –
PCIE_X16 / X8_3
shared
(X16/X8)
– – – – – – –
PCIE_X4_4 shared – – – – – – –
USB1 OHCI Controller – – shared – – – – –
USB1 EHCI Controller – shared – – – – – –
USB2 OHCI Controller – – shared – – – – –
USB2 EHCI Controller – shared – – – – – –
USB3 OHCI Controller – – shared – – – – –
USB3 EHCI Controller – shared – – – – – –
SB SATA/AHCI
Controller
– – – shared – – – –
LAN – – – shared – – – –
1394 – – – – – – shared –
Audio shared – – – – – – –
JMicron SATA
Controller
– – – – shared – – –
USB 3.0 – – – shared – – – –
2-24 Chapter 2: Hardware information