User Guide

ASUS RS162-E4/RX4

2-19

IRQ Priority Standard Function

0 1 System Timer

1 2 Kayboard Controller

2 N/A Progerammable Interrupt

3* 11 Communications Port (COM2) *

4* 12 Communications Port (COM1) *

5* 13 Sound Card (cometimes LPT2)

6 14 Floppy Disk Controller

15 Printer Port (PT1)

8 3 System CMOS/Real time clock

9* 4 ACPI Mode when used

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

Standard interrupt assignments

INTA# INTB# INTC# INTD# REQ# GNT#

PATA controller PIRQA#

SATA controller PIRQD#

SMBus controller PIRQB#

USB UHCI controller 1 PIRQA

USB UHCI controller 2 PIRQD

USB 2.0 UHCI controller PIRQH

82563EBX1 PIRQB

82563EBX2 PIRQB

ATI Rage XL PIRQB REQ1# GNT1#

PCIX Slot1 (64-bit) PXIRQ0 PXIRQ1 PXIRQ2 PXIRQ3 PXREQ0 PXGNT0

PCI Express Slot 2 PIRQA#

PCIX Slot 2 (64-bit) PXH_IRQ#0 PXH_IRQ#1 PXH_IRQ#2 PXH_IRQ#3 REQ0# GNT0#

*These IRQs are usually available for expansion cards.

IRQ assignments for this motherboard

When using PCI cards on shared slots, ensure that the drivers support

"Share IRQ" or that the cards do not need IRQ assignments. Otherwise,

conflicts will arise between the two PCI froups, making the ystem

unstable and the card inoperable.