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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
MSI
PBIRQ
PCI-X SLOT
REQ/GNT: 0
IDSEL: AD17
ABCD
PAIRQ
0
1
2
3
0
1
2
3
4
5
6
7
PXH
CPU0
PCI-X SLOT
REQ/GNT: 0
IDSEL: AD17
ABCD
PCI-X SLOT
REQ/GNT: 1
IDSEL: AD18
ABCD
PCI-X 64/100
PCI-X 64/133
PCI-X 2.0
PIRQ
PCI-X SLOT
REQ/GNT: 0
IDSEL: AD16
ABCD
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
NMISMI
IDE
IRQ14/15
SERIRQ
MSI
CPU0
NMISMI MSI
NMISMI MSI
SIO
A
PCI-X SLOT
REQ/GNT: 0
IDSEL: AD17
ABCD
PCI-X SLOT
REQ/GNT: 1
IDSEL: AD18
ABCD
FSB
MCH
PCI-E
MSI MSI MSI MSI
HI
MSI
PCI-E
4x
MSI
PCI-E
8x
MSI