Intel Desktop Board D975XBX Technical Product Specification
54
Table 14. PCI Interrupt Routing Map
ICH7-R/ICH7-DH PIRQ Signal Name
PCI Interrupt Source
PIRQA PIRQB PIRQC PIRQD PIRQE PIRQF PIRQG PIRQH
PCI bus connector 1 INTD INTA INTB INTC
PCI bus connector 2 INTD INTC INTA INTB
IEEE-1394a controller INTA
Discrete SATA Controller INTA
NOTE
In PIC mode, the ICH7-R/ICH7-DH 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 13 for the
allocation of PIRQ lines to IRQ signals in APIC mode.
PCI interrupt assignments to the USB ports, Serial ATA ports, and PCI Express ports are dynamic.
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