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5−2
16-Bit Legacy-Mode Base Address
PCI7x21/PCI7x11 Configuration Registers
10hCardBus Socket/ExCA Base Address
Note: The 16-bit legacy-mode base address
register is shared by function 0 and 1 as
indicated by the shading.
44h
Index
Data
Host I/O Space
PC Card A
ExCA
Registers
PC Card B
ExCA
Registers
00h
Offset
3Fh
40h
7Fh
Offset of desired register is placed in the index register and the
data from that location is returned in the data register.
Offset
Figure 5−1. ExCA Register Access Through I/O
16-Bit Legacy-Mode Base Address
CardBus Socket/ExCA Base Address
10h
44h
CardBus
Socket A
Registers
ExCA
Registers
Card A
20h
800h
844h
Host
Memory Space
CardBus
Socket B
Registers
ExCA
Registers
Card B
20h
800h
844h
Host
Memory Space
Note: The CardBus socket/ExCA base
address mode register is separate for
functions 0 and 1.
address register’s base address.
Offsets are from the CardBus socket/ExCA base
00h
00h
PCI7x21/PCI7x11 Configuration Registers
Offset
Offset
Offset
Figure 5−2. ExCA Register Access Through Memory