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2-182-18
2-182-18
2-18
Chapter 2: Hardware informationChapter 2: Hardware information
Chapter 2: Hardware informationChapter 2: Hardware information
Chapter 2: Hardware information
2.5.32.5.3
2.5.32.5.3
2.5.3
Interrupt assignmentsInterrupt assignments
Interrupt assignmentsInterrupt assignments
Interrupt assignments
Standard interrupt assignmentsStandard interrupt assignments
Standard interrupt assignmentsStandard interrupt assignments
Standard interrupt assignments
IRQIRQ
IRQIRQ
IRQ
PriorityPriority
PriorityPriority
Priority
Standard FunctionStandard Function
Standard FunctionStandard Function
Standard Function
0 1 System Timer
1 2 Keyboard Controller
2 — Re-direct to IRQ#9
3 11 Communications Port (COM2)*
4 12 Communications Port (COM1)*
5 13 IRQ holder for PCI steering*
6 14 Floppy Disk Controller
7 15 Printer Port (LPT1)*
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 PS/2 Compatible Mouse Port*
13 8 Numeric Data Processor
14 9 Primary IDE Channel
15 10 Secondary IDE Channel
* These IRQs are usually available for ISA or PCI devices.
PCI Bus Number, IDSEL, and IRQ assignmentsPCI Bus Number, IDSEL, and IRQ assignments
PCI Bus Number, IDSEL, and IRQ assignmentsPCI Bus Number, IDSEL, and IRQ assignments
PCI Bus Number, IDSEL, and IRQ assignments
DescriptionDescription
DescriptionDescription
Description
INTAINTA
INTAINTA
INTA
INTBINTB
INTBINTB
INTB
INTCINTC
INTCINTC
INTC
INTDINTD
INTDINTD
INTD
REQ#REQ#
REQ#REQ#
REQ#
GNT#GNT#
GNT#GNT#
GNT#
IDE Controller PIRQC#
SATA Controller PIRQC#
SMBus Controller PIRQB#
USB UHCI Controller #1 PIRQA#
USB UHCI Controller #2 PIRQD#
USB 2.0 EHCI Controller PIRQH#
AIC7901 SCSI controller PXIRQ2# X_REQ3# X_GNT3#
ATI RAGE XL PIRQB# REQ2# GNT2#
PCIX Slot 1 PXIRQ0# PXIRQ1# PXIRQ2# PXIRQ3# X_IRQ0# X_IRQ0#
PCIX Slot 2 PXIRQ3# PXIRQ1# PXIRQ0# PXIRQ2# X_IRQ1# X_IRQ1#
PCI Express Slot3
PCIX Slot 4 PIRQE# PIRQF# PIRQG# PIRQH# REQ0# GNT0#
PCIX Slot 5 PIRQG# PIRQH# PIRQE# PIRQF# REQ1# GNT1#