Appendix C
Functional Description
C-19
C.7.2
PCI Address Assignments
The following table lists the PCI address assignments.
C.7.2.1
PCI Bus A Address Assignments
PCI bus A has all the PCI slots and the address is programmable by the OpenBoot
PROM.
C.7.2.2
PCI Bus B Address Assignments
The PCI bus B address assignments are as follows:
■
PCIO ASIC registers
■
Boot PROM
PCIO ASIC Registers
The PCIO ASIC is a PCI client and the address can be reprogrammed by software
during boot only. Therefore, instead of providing absolute addresses for each of the
registers, only offset addresses, relative to a base address, are given.
The PCIO ASIC is a multifunction PCI device and its configuration space has three
base address pointers:
■
Boot PROM
■
EBus2 (function 0)
■
Ethernet (function 1)
TABLE C-9
PCI Address Assignments
Address Range in PCI Address
Size
PCI Space Addressed
Notes
0x8000.0000 - 0xBFFF.FFFF
1 Gbyte
Primary PCI DVMA space
CPU DVMA register
(equals 0x30)
0x4000.0000 - 0x7FFF.FFFF
1 Gbyte
PCI bus A memory space
PCI slots APB ASIC
register (equals 0xc)
0x40.0000 - 0x7f.ffff
4 Mbytes
PCI bus A I/O space
PCI slots
0x0000.0000 - 0x3FFF.FFFF
0xC000.0000 - 0xFFFF.FFFF
2 Gbytes
PCI bus B memory space
On-board PCI bus
APB ASIC B register
(equals 0xc3)
0x00.0000 - 0x3f.FFFF
0xC0.0000 - 0xFF.FFF
8 Mbytes
PCI bus B I/O space
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