Intel Desktop Board D815EEA2/D815EPEA2 Technical Product Specification
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The ICH2 has eight programmable interrupt request (PIRQ) input signals. All PCI interrupt
sources either onboard or from a PCI add-in card connect to one of these PIRQ signals. Some PCI
interrupt sources are electrically tied together on the D815EEA2 and D815EPEA2 boards and
therefore share the same interrupt. Table 18 shows an example of how the PIRQ signals are routed
on the D815EEA2 and D815EPEA2 boards.
For example, using Table 18 as a reference, assume that an add-in card using INTA is plugged into
PCI bus connector 3. In PCI bus connector 3, INTA is connected to PIRQH, which is already
connected to ICH2 USB controller #2. The add-in card in PCI bus connector 3 now shares
interrupts with these onboard interrupt sources.
Table 18. PCI Interrupt Routing Map
ICH PIRQ Signal Name
PCI Interrupt Source
PIRQF PIRQG PIRQH PIRQB Other
GMCH/AGP INTB INTA to PIRQA
ICH2 USB controller #1 INTD to PIRQD
SMBus controller INTB
ICH2 USB controller #2 INTC
ICH2 audio/modem INTB
ICH2 LAN INTA to PIRQE
PCI bus connector 1 (J7B1) INTA INTB INTC INTD
PCI bus connector 2 (J8B2) INTD INTA INTB INTC
PCI bus connector 3 (J9B2) INTC INTD INTA INTB
PCI bus connector 4 (J9B1) INTB INTC INTD INTA
PCI bus connector 5 (J10B1) INTA INTB INTC INTD
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NOTE
The ICH2 can connect each PIRQ line internally to one of the IRQ signals (3, 4, 5, 6, 7, 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.
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