Asus P4B-LA, Руководство пользователя

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P4B-LA Quick Start Manual 21
3. HARDWARE SETUP
Expansion Cards 3. H/W SETUP
3.7.2 Assigning IRQs for Expansion Cards
Some expansion cards need an IRQ to operate. Generally, an IRQ must be assigned
exclusively to one use. In a standard design, there are 16 IRQs available but most of
them are already in use, leaving 6 IRQs free for expansion cards. If the motherboard
has PCI audio onboard, an additional IRQ will be used. If the motherboard also has
MIDI enabled, another IRQ will be used, leaving 4 IRQs free.
Standard Interrupt Assignments
IRQ Priority Standard Function
0 1 System Timer
1 2 Keyboard Controller
2 N/A Programmable Interrupt
3* 11 Communications Port (COM2)
4* 12 Communications Port (COM1)
5* 13 Sound Card (sometimes LPT2)
6 14 Floppy Disk Controller
7* 15 Printer Port (LPT1)
8 3 System CMOS/Real Time Clock
9* 4 ACPI Mode when enabled
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.
Interrupt Request Table for this Motherboard
Interrupt requests are shared as shown by the following table:
A B C D E F G H
PCI slot 1 — — — — — shared — —
PCI slot 2 — — — — — — used —
PCI slot 3 — — — — — — — shared
PCI slot 4 — — — — shared — — —
PCI slot 5 — — — — — shared — —
Onboard USB controller HC0 — — — used — — — —
Onboard USB controller HC1 — — — — — — — shared
AGP used — — — — — — —
LAN — — — — shared — — —
Onboard Audio — — — — — shared — —
IMPORTANT:
If using PCI cards on shared slots, make sure that the drivers sup-
port “Share IRQ” or that the cards do not need IRQ assignments. Conflicts will arise
between the two PCI groups that will make the system unstable or cards inoperable.