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Intel® Server Board SE7520JR2 Functional Architecture
Revision 1.0
C78844-002
55
3.4.3.5 IRQ Scan for PCIIRQ
The IRQ / data frame structure includes the ability to handle up to 32 sampling channels with
the standard implementation using the minimum 17 sampling channels. The Server Board
SE7520JR2 has an external PCI interrupt serializer for PCIIRQ scan mechanism of ICH5-R to
support 16 PCIIRQs.
Figure 8. Interrupt Routing Diagram (ICH5-R Internal)
IRQ0
IRQ1
IRQ2
IRQ3
IRQ4
IRQ5
IRQ6
IRQ7
IRQ8
IRQ9
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
IRQ16
IRQ1
7
ICH5
-
R
MCH
HI 1.5
ICH5-R
8259PIC
IRQ0
IRQ1
IRQ2
IRQ3
IRQ4
IRQ5
IRQ6
IRQ7
IRQ8
IRQ9
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
IRQ16
IRQ1
7
PXH
IOAPIC 1
IRQ0
IRQ1
IRQ2
IRQ3
IRQ4
IRQ5
IRQ6
IRQ7
IRQ8
IRQ9
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
IRQ16
IRQ1
7
PXH
IOAPIC 2
CPU1
CPU2
INTR
INTR
HI1.5
INTERFACE
PCI-E INTERFACE
PCI-E INTERFACE
ICH5-R