Asus CROSSHAIR IV FORMULA User Guide - Page 50

Interrupt assignments, IRQ assignments for this motherboard - usb 3 0

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2.5.3 Interrupt assignments Standard interrupt assignments 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 * These IRQs are usually available for PCI devices. IRQ assignments for this motherboard PCIE_X16_1 PCI_1 A B shared - - - PCIE_X8 / X1_2 - - PCI_2 PCIE_X16 / X8_3 PCIE_X4_4 - - shared (X16/X8) - shared - USB1 OHCI Controller - - USB1 EHCI Controller - shared USB2 OHCI Controller - - USB2 EHCI Controller - shared USB3 OHCI Controller - - USB3 EHCI Controller - SB SATA/AHCI Controller - LAN - shared - - 1394 - - Audio JMicron SATA Controller USB 3.0 shared - - - - - C - - - - - - shared - shared - shared - - - - - - - D - - - - - shared shared - - - shared E - shared shared (X8) - - - - - - shared - F - - - shared - - - - - - - G - - - - - - - shared - - - H - - shared (X1) - - - - - - - - 2-24 Chapter 2: Hardware information

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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