Datasheet

Technical Reference
35
2.5 PCI Configuration Space Map
Table 13. PCI Configuration Space Map
Bus
Number (hex)
Device
Number (hex)
Function
Number (hex) Description
00 00 00 ATI Host Bridge
00 02 00 ATI PCI Express x16 port Bridge
(Note 1)
00 06 00 ATI PCI Express x1 port Bridge
(Note 2)
00 11 00 ATI IDE controller
00 12 00 ATI IDE controller
00 13 00 ATI USB OHCI controller 1
00 13 01 ATI USB OHCI controller 2
00 13 02 ATI USB OHCI controller 3
00 14 00 ATI SMBus controller
00 14 01 ATI IDE controller
00 14 02 ATI Azalia controller
00 14 03 ATI ISA bridge
00 14 04 ATI Decode PCI/PCI bridge
01 05 00 ATI VGA controller
01
(Notes 1 and 3)
PCI Express x16 connector
02
(Notes 2 and 3)
PCI Express x1 connector
02
(Note 3)
02 00 Ethernet controller
03
(Note 3)
03 00 PCI Conventional bus connector 1
03
(Note 3)
04 00 PCI Conventional bus connector 2
Notes:
1. Present only when a PCI Express x16 graphics card is installed.
2. Present only when a PCI Express x1 add-in card is installed.
3. Bus number is dynamic and can change based on add-in cards used.
2.6 PCI Conventional Interrupt Routing Map
Table 14 lists how the PIRQ signals are routed.
Table 14. PCI Interrupt Routing Map
IXP 450 PIRQ Signal Name
PCI Interrupt Source
PIRQA PIRQB PIRQC PIRQD PIRQE PIRQF PIRQG PIRQH
PCI bus connector 1 INTA INTB INTC INTD
PCI bus connector 2 INTB INTC INTD INTA
Realtek LAN INTF