PCI1221 datasheet(80/123 Pages) TI

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ExCA compatibility registers (functions 0 and 1)

The ExCA registers implemented in the PCI1221 are register-compatible with the Intel 82365SL–DF PCMCIA

controller. ExCA registers are identified by an offset value that is compatible with the legacy I/O index/data

scheme used on the Intel 82365 ISA controller. The ExCA registers are accessed through this scheme by writing

the register offset value into the index register (I/O base) and reading or writing the data register (I/O base +

1). The I/O base address used in the index/data scheme is programmed in the PC Card 16-Bit I/F legacy mode

base address register, which is shared by both card sockets. The offsets from this base address run contiguous

from 00h to 3Fh for socket A, and from 40h to 7Fh for socket B. Refer to Figure 21 for an ExCA I/O mapping

illustration.

CardBus Socket/ExCA Base Address

16-Bit Legacy-Mode Base Address

10h

44h

00h

3Fh

Offset

Index

Host I/O Space

Data

PC Card A

ExCA

Registers

PC Card B

ExCA

Registers

40h

7Fh

NOTE: The 16-bit legacy mode base address register is shared by functions 0 and 1 as indicated by the shading.

PCI1221 Configuration Registers

Offset

Figure 21. ExCA Register Access Through I/O

PCI1221 Datasheet(PDF) 80 Page - Texas Instruments