Intel D845HV Product Specification - Page 50
D845HV and D845WN boards.
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Intel Desktop Board D845HV/D845WN Technical Product Specification 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 D845HV and D845WN boards and therefore share the same interrupt. Table 17 shows an example of how the PIRQ signals are routed on the D845HV and D845WN boards. For example, using Table 17 as a reference, assume an add-in card using INTB is plugged into PCI bus connector 3. In PCI bus connector 3, INTB is connected to PIRQB, which is already connected to the SMBus. The add-in card in PCI bus connector 3 now shares interrupts with these onboard interrupt sources. Table 17. PCI Interrupt Routing Map PCI Interrupt Source AGP connector ICH2 USB controller #1 SMBus controller ICH2 USB controller ICH2 Audio / Modem ICH2 LAN PCI Bus Connector 1 PCI Bus Connector 2 PCI Bus Connector 3 PCI Bus Connector 4 (Note) PCI Bus Connector 5 (Note) PCI Bus Connector 6 (Note) Note: D845WN board only. PIRQF INTA INTD INTC INTB INTA INTB ICH2 PIRQ Signal Name PIRQG PIRQH PIRQB Other INTB INTA to PIRQA INTD to PIRQD INTB INTC to PIRQH INTB INTA to PIRQE INTB INTC INTD INTA INTB INTC INTD INTA INTB INTC INTD INTA INTB INTC INTD INTC INTD INTA NOTE The ICH2 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. 50