Host I/O Space
Offset
00h
PCI6x21/PCI6x11 Configuration Registers
Offset
PC Card A
ExCA
Registers
CardBus Socket/ExCA Base Address
16-Bit Legacy-Mode Base Address
10h
44h
Index
Data
3Fh
40h
PC Card B
ExCA
Registers
7Fh
Note: The 16-bit legacy-mode base address
register is shared by function 0 and 1 as
indicated by the shading.
Offset of desired register is placed in the index register and the
data from that location is returned in the data register.
Figure 5−1. ExCA Register Access Through I/O
Host
Memory Space
Host
Memory Space
PCI6x21/PCI6x11 Configuration Registers
Offset
00h
Offset
Offset
CardBus
Socket A
Registers
10h
44h
CardBus Socket/ExCA Base Address
16-Bit Legacy-Mode Base Address
20h
00h
CardBus
Socket B
Registers
800h
ExCA
Registers
Card A
20h
844h
800h
ExCA
Registers
Card B
Note: The CardBus socket/ExCA base
address mode register is separate for
functions 0 and 1.
844h
Offsets are from the CardBus socket/ExCA base
address register’s base address.
Figure 5−2. ExCA Register Access Through Memory
5−2
TI [ TEXAS INSTRUMENTS ]
