Technical information

7-12
AIC-6915 Ethernet LAN Controller Programmer’s Manual
PCI HighBASEADR0 (Base Address 0) Register
Type: R/W
Internal Registers Subgroup: PCI Configuration Header
Byte Address: 14h - 17h
Note
: When an access is made to an address that is mapped and enabled in both the
BASEADR0
and
EXROMCTL
registers, the PCI responds with a target abort.
PCI BASEADR1 (Base Address 1) Register
Type: R/W
Internal Registers Subgroup: PCI Configuration Header
Byte Address: 18h - 1Ch
PCI CCIS (Configuration Card Information Structure) Register
Type: R
Internal Registers Subgroup: PCI Configuration Header
Byte Address: 28h - 2Bh
The
CCIS
register points to one of the possible address spaces where the card
information structure begins. The pointer is used in a CardBus PC card environment.
The value of this register is loaded from the external serial EPROM after a PCI hard
reset.
Table 7-16. High Base Address 0 Register
Bit(s) rw
Reset
Value Description/Function
31:0 r/w 0
BASEADR0[63:32]:
Contains the upper 32-bits of memory address
where the AIC-6915 is mapped.
Table 7-17. Base Address 1 Register
Bit(s) rw
Reset
Value Description/Function
31:8 r/w 0
BASEADR1[31:8]:
Indicates the mapping capability of the 256-
byte system I/O space.
7:2 r 0
BASEADR1[7:3]:
Indicates address space requirement. Always
read as 0.
1r0
Reserved:
Always read as 0.
0r1
I/O Space Indicator:
Always reads 1.
Table 7-18. Configuration Card Information Structure Register
Bit(s) rw
Reset
Value Description/Function
31:28 r 0 ROM Image
27:3 r 0 AddressSpaceOffset
2:0 r 0 AddressSpaceIndicator