Specifications

ASUS M4A78T-E
2-17
Chapter 2
IRQ assignments for this motherboard
A B C D E F G H
PCIE x16_1 shared shared shared shared – – – –
PCIE x16_2 shared shared shared shared – – – –
PCIE x1_1 shared shared shared shared – – – –
PCIE x1_2 shared shared shared shared – – – –
PCI_1 shared shared shared shared – – – –
PCI_2 shared shared shared shared – – – –
USB controller 1 – – – shared – – – –
USB controller 2 – – – shared – – – –
USB controller 3 – – – shared – – – –
USB controller 4 – – – shared – – – –
USB 2.0 controller – – – shared – – – –
HD audio shared – – – – – – –
Onboard SATA – – – – shared – –
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 Floppy Disk Controller
7 15 Reserved
8 3 System CMOS/Real Time Clock
9 4 AMD ACPI-Compliant System
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
15 10 Secondary IDE Channel
* These IRQs are usually available for ISA or PCI devices.