Intel Desktop Board DG965RY Technical Product Specification
48
Table 16. PCI Interrupt Routing Map
ICH8 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
PCI bus connector 3
INTD
INTC INTA INTB
IEEE-1394a
controller
INTA
NOTE
In PIC mode, the ICH8 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 14 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 49)
•
Component-side connectors and headers (see page 50)