Specifications

Intel Desktop Board DG965OT Technical Product Specification

Table 17. PCI Interrupt Routing Map

ICH8DH PIRQ Signal Name

PCI Interrupt Source

PIRQA PIRQB PIRQC PIRQD PIRQE PIRQF PIRQG PIRQH

ICH8 LAN INTA

PCI bus connector 1 INTD INTA INTB INTC

PCI bus connector 2 INTC INTB INTA INTD

IEEE-1394a controller INTA



NOTE

In PIC mode, the ICH8DH can connect each PIRQ line internally to one of the IRQ

signals (3, 4, 5, 6, 7, 9, 10, 11, 12, 14, and 15). Typically, a device that does not

share a PIRQ line will have a unique interrupt. However, in certain interrupt-

constrained situations, it is possible for two or more of the PIRQ lines to be connected

to the same IRQ signal. Refer to

Table 15 for the allocation of PIRQ lines to IRQ

signals in APIC mode.

PCI interrupt assignments to USB ports and Serial ATA ports are dynamic.

2.8 Connectors and Headers

CAUTION

Only the following connectors have overcurrent protection: Back panel and front panel

USB, PS/2, and VGA.

The other internal connectors/headers are not overcurrent protected and should

connect only to devices inside the computer’s chassis, such as fans and internal

peripherals. Do not use these connectors/headers to power devices external to the

computer’s chassis. A fault in the load presented by the external devices could cause

damage to the computer, the power cable, and the external devices themselves.

This section describes the board’s connectors and headers. The connectors and

headers can be divided into these groups:

• Back panel I/O connectors (see page

51)

• Component-side connectors and headers (see page

52)