1-20
Chapter 1: Product introduction
Interrupt assignments
IRQ
Standard Function
0
System timer
1
Standard 101/102-Key or Microsoft Natural Keyboard
2
Programmable interrupt controller
3
Standard OpenHCI USB Host Controller
4
Communications Port (COM1)
5
ACPI IRQ Holder for PCI IRQ Steering
6
(free)
7
(free)
8
System CMOS/real time clock
9
SCI IRQ used by ACPI bus
10
Standard PCI Graphics Adapter (VGA)
11
(free)
12
Microsoft PS/2 Port Mouse
13
Numeric data processor
14
Primary IDE controller (single fifo)
15
Secondary IDE controller (single fifo)
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 groups, making the system unstable and the card
inoperable.
IRQ assignments for this motherboard
A
B
C
D
E
F
G
H
PCIE X1 slot
shared
-
-
-
-
-
-
-
PCIE X16 slot
-
-
shared
-
-
-
-
-
Onboard USB1.1 controller 1 shared
-
-
-
-
-
-
-
Onboard USB1.1 controller 2
-
-
-
-
-
-
-
-
Onboard USB1.1 controller 3
-
-
shared
-
-
-
-
-
Onboard USB1.1 controller 4
-
-
-
-
-
-
-
-
Onboard USB1.1 controller 5
-
-
shared
-
-
-
-
-
Onboard USB2.0 controller 1
-
-
-
-
-
-
-
-
Onboard USB2.0 controller 2
-
-
-
-
-
-
-
-
Onboard ATI RS780 AZALIA
-
-
shared
-
-
-
-
-
Onboard IDE port
shared
-
-
-
-
-
-
-
Onboard HD audio
shared
-
-
-
-
-
-
-
Onboard LAN
-
-
shared
-
-
-
-
-
Onboard VGA
-
-
shared
-
-
-
-
-
Onchip SATA
-
-
-
-
-
-
shared
-
PCI Card1
-
-
-
-
shared
-
-
-
PCI Card2
-
-
-
-
-
shared
-
-
Summary of Contents for M3A78-CM - Motherboard - Micro ATX
Page 1: ...Motherboard M3A78 CM ...
