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Frequently Asked Questions
Q: How are the interrupts routed on the 4000832 motherboard?A: For APIC mode, the motherboard interrupt architecture incorporates three Intel® APIC devices to manage and broadcast interrupts to local APICs in each processor. One of the APICs is located in the ICH3-S and the other two APICs are in the P64H2 (one for each PCI bus). The I/O APICs monitor each interrupt on each PCI device including PCI. When an interrupt occurs, a message corresponding to the interrupt is sent across the FSB processors.
The following table shows how the interrupts from the embedded devices and the PCI-X slots are connected.
| | IRQ | Device |
PCI Riser Connector | PCI Riser Slot 1 | PCI Riser Slot 2 | PCI Riser Slot 3 | Other |
| ICH3 | IRQA | | | | | P64H2 |
| IRQB | | | | | Video |
| IRQC | | | | | Promise ATA |
| IRQD | | | | | |
| IRQE | | | | | |
| IRQF | | | | | |
| IRQG | | | | | |
| IRQH | | | | | |
| IRQ14 | | | | | Pri IDE |
| IRQ15 | | | | | Sec IDE |
| SER IRQ | | | | | SIO |
| P64H2 Ch A | IRQ0 | LP INTA | LP INTA | LP INTD | LP INTC | |
| IRQ1 | LP INTC | LP INTC | | | SCSI INTB |
| IRQ2 | LP INTD | LP INTD | | | SCSI INTA |
| IRQ3 | LP INTB | LP INTB | LP INTA | LP INTD | |
| IRQ4 | LP TDO | | LP INTB | LP INTA | |
| IRQ5 | LP TCK | | LP INTC | LP INTB | |
| IRQ6 | | | | | |
| IRQ7 | | | | | |
| IRQ8 | | | | | |
| IRQ9 | | | | | |
| IRQ10 | | | | | |
| IRQ11 | | | | | |
| IRQ12 | | | | | |
| IRQ13 | | | | | |
| IRQ14 | | | | | |
| IRQ15 | | | | | |
| P64H2 Ch B | IRQ1 | FL INTC | FL INTC | | | |
| IRQ2 | FL INTD | FL INTD | | | |
| IRQ3 | FL INTB | FL INTB | FL INTA | FL INTD | |
| IRQ4 | FL TDO | | FL INTB | FL INTA | |
| IRQ5 | FL TCK | | FL INTC | FL INTB | |
| IRQ6 | | | | | Gigabit Ch A |
| IRQ7 | | | | | Gigabit Ch B |
| IRQ8 | | | | | |
| IRQ9 | | | | | |
| IRQ10 | | | | | |
| IRQ11 | | | | | |
| IRQ12 | | | | | |
| IRQ13 | | | | | |
| IRQ14 | | | | | |
| IRQ15 | | | | | |
Note:
LP = Low Profile
FL = Full Length
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