12
Standard Interrupt Assignments
IRQ Priority
Standard
function
0 N/A
System
Timer
1 N/A
Keyboard
Controller
2 N/A
Programmable
Interrupt
3 *
8
Communications Port (COM2)
4 *
9
Communications Port (COM1)
5 *
6
Sound Card (sometimes LPT2)
6 *
11
Floppy Disk Controller
7 *
7
Printer Port (LPT1)
8
N/A
System CMOS/Real Time Clock
9 *
10
ACPI Mode when enabled
10 *
3
IRQ Holder for PCI Steering
11 *
2
IRQ Holder for PCI Steering
12 *
4
PS/2 Compatible Mouse Port
13 N/A
Numeric
Data
Processor
14 *
5
Primary IDE Channel
15 *
1
Secondary IDE Channel
* These IRQs are usually available for ISA or PCI devices.
2-5-3 Interrupt Request Table For This Motherboard
Interrupt request are shared as shown the table below:
INT A INT B
INT C
INT D
INT E
INT F
INT G INT H
Slot 1
√
Slot 2
√
Slot 3
√
Onboard USB 3
√
HD Audio/MC97
√
IMPORTANT!
If using PCI cards on shared slots, make sure that the drivers support “Shared IRQ” or
that the cards don’t need IRQ assignments. Conflicts will arise between the two PCI
groups that will make the system unstable or cards inoperable.
2-5-4 PCI Express Slot
AMD 780V Series motherboard series offer one PCI-Express2.0 x16@ 16 lane graphics slots
and one PCI-Express2.0 x16 by 4lane. Fully compliant to the PCI Express Base
Specification revision 2.0, support PCI Express VGA card, and other PCI Express device.
Each PCI-Express2.0 x16by 16 slots deliver up to 8Gbyte/sec data transfer rate at each
relative direction and up 16 Gbyte/sec concurrently. One PCI Express2.0 x1 I/O slot offers 1
Gbyte/sec concurrently, over 7 times more bandwidth than PCI at 133Mbye/sec, tackling the
most demanding multimedia tasks nowadays. The AMD 780V motherboards also carry two
32-bit PCI slots guarantee the rich connectivity for the I/O peripheral devices.
