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Intel® Server Board Set SE8500HW4 I/O Subsystems
Revision 1.0
Intel order number D22893-001
11
3. I/O Subsystems
3.1 PCI Subsystem
The PCI subsystem consists of eight slots, seven available to standard PCI adapters and one
for the Intel
®
Server Board Set SE8500HW4-specific Intel
®
Fibre Channel Module.
Table 3. PCI Expansion Slot Features
Segment Slot Hot Plug Technology Width Bandwidth
(GB/s)
North Bridge (C) 1 Yes PCI Express* x8 4
PXH (A) 2 Yes PCI-X* 133 64-bit 1
North Bridge (D) 3 Yes PCI Express x4 2
North Bridge (B) 4 Yes PCI Express x4 2
North Bridge (B) 5 Yes PCI Express x4 2
Intel
®
IOP332 Storage I/O
Processor (B)
6 No PCI-X 100 64-bit 0.8
Intel IOP332 Storage I/O
Processor (B)
7 No PCI-X 100 64-bit 0.8
Intel IOP332 Storage I/O
Processor (A)
Fibre Channel No PCI-X 100 64-bit 0.8
3.1.1 PCI Interrupts
PCI Express interrupts are delivered in-band over the PCI Express bus via the Message Signal
Interrupt (MSI) mechanism.
PCI and PCI-X devices can deliver interrupts either by asserting IRQ signals that are routed to
the PXH or Intel
®
IOP332 Storage I/O Processor IOxAPIC, or over the PCI-X bus via MSI. In
either case, the PXH and/or Intel® IOP332 Storage I/O Processor forward the interrupt to the
NB as an Inbound Write for the processor to handle the event.
Table 4 describes how the interrupts for each of the PCI devices are mapped to the PXH and
Intel
®
IOP332 Storage I/O Processor.
Table 4. PCI Interrupt Mapping
Device APIC INTA# INTB# INTC# INTD#
Broadcom*
BCM5704
PXH (B) PX2B_IRQ0_N PX2B_IRQ1_N
Slot 2 PXH (A) PX2A_IRQ0_N PX2A_IRQ1_N PX2A_IRQ2_N PX2A_IRQ3_N
Slot 6 Intel
®
IOP332 Storage I/O
Processor (B)
PX1B_XINT4_N PX1B_XINT5_N PX1B_XINT6_N PX1B_XINT7_N
Slot 7 Intel IOP332 Storage I/O
Processor (B)
PX1B_XINT6_N PX1B_XINT7_N PX1B_XINT4_N PX1B_XINT5_N