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5 platform irq routing, Figure 9. irq routing diagram, Platform irq routing – Intel Xeon User Manual

Page 29: Irq routing diagram, System overview, Irq14 and 15 for ide segment, Serirq for siopixrq segment, Pcrirq for the pci-x segment

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Intel

®

Xeon™ Processor, Intel

®

E7520 Chipset, Intel

®

6300ESB ICH Development Kit User’s Manual

29

System Overview

5.5

Platform IRQ Routing

Figure 9

shows that the Intel 6300ESB I/O Controller uses these segments:

IRQ14 and 15 for IDE segment

SERIRQ for SIOPIXRQ segment

PCRIRQ for the PCI-X segment

PIRQ for the PCI 32/33 segment

A Message Signalled Interrupt (MSI) scheme is used between the MCH and PXH over the PCI
Express bus. The PXH uses PAIRQ for the Channel A interface to PCI-X 64-bit/100 MHz
peripherals and PBIRQ for the Channel B interface to PCI-X 64/133. MSI and Non Maskable
Interrupt (NMI) are connected from the Intel 6300ESB I/O Controller to CPU0 and CPU1. The
platform also supports MSI for maskable and non-maskable interrupts.

Figure 9.

IRQ Routing Diagram

B2940-02

MSI

HI

FSB

PCI-E

PCI-E

PCI-E

NMI

SMI

PBIRQ

PCI-X SLOT

REQ/GNT: 0

IDSEL: AD17

A B C D

PAIRQ

0
1
2
3

0
1
2
3
4
5
6
7

PXH

CPU0

PCI-X SLOT

REQ/GNT: 0

IDSEL: AD17

A B C D

PCI-X SLOT

REQ/GNT: 1

IDSEL: AD18

A B C D

PCI-X 64/100

PCI-X 64/133

PCI-X 2.0

PIRQ

PCI-X SLOT

REQ/GNT: 0

IDSEL: AD16

A B C D

PXIRQ

A
B
C
D

A
B
C
D
E

F

G
H

Intel

®

6300ESB

I/O

Controller

Hub

Video

REQ/GNT: 1

IDSEL: AD17

PCI-X 64/66

PCI-X 32/33

NMI

SMI

IDE

IRQ14/15

SERIRQ

MSI

CPU0

NMI

SMI

MSI

NMI

SMI

MSI

SIO

A

PCI-X SLOT

REQ/GNT: 0

IDSEL: AD17

A B C D

PCI-X SLOT

REQ/GNT: 1

IDSEL: AD18

A B C D

FSB

MCH

PCI-E

MSI

MSI

MSI

MSI

HI

MSI

PCI-E

4x

MSI

PCI-E

8x

MSI

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