PCI1221 datasheet(81/123 Pages) TI

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ExCA compatibility registers (functions 0 and 1) (continued)

The TI PCI1221 also provides a memory mapped alias of the ExCA registers by directly mapping them into PCI

memory space. They are located through the CardBus Socket Registers/ExCA Registers Base Address

by function. Refer to Figure 22 for an ExCA memory mapping illustration. Note that memory offsets are

800h–844h for both functions 0 and 1. This illustration also identifies the CardBus Socket Register mapping,

which are mapped into the same 4K-window at memory offset 0h.

CardBus Socket/ExCA Base Address

16-Bit Legacy-Mode Base Address

10h

44h

NOTE: The CardBus socket/ExCA base address mode register is separate for functions 0 and 1.

PCI1221 Configuration Registers

CardBus

Socket A

Registers

Host

Memory Space

00h

ExCA

Registers

Card A

20h

800h

844h

Offset

CardBus

Socket B

Registers

Host

Memory Space

00h

ExCA

Registers

Card B

20h

800h

844h

Offset

Figure 22. ExCA Register Access Through Memory

The interrupt registers, as defined by the 82365SL–DL Specification, in the ExCA register set control such card

functions as reset, type, interrupt routing, and interrupt enables. Special attention must be paid to the interrupt

routing registers and the host interrupt signaling method selected for the PCI1221 to ensure that all possible

PCI1221 interrupts can potentially be routed to the programmable interrupt controller. The ExCA registers that

are critical to the interrupt signaling are at memory address ExCA offset 803h and 805h.

Access to I/O mapped 16-bit PC cards is available to the host system via two ExCA I/O windows. These are

regions of host I/O address space into which the card I/O space is mapped. These windows are defined by start,

end, and offset addresses programmed in the ExCA registers described in this section. I/O windows have byte

granularity.

Access to memory mapped 16-bit PC Cards is available to the host system via five ExCA memory windows.

These are regions of host memory space into which the card memory space is mapped. These windows are

defined by start, end, and offset addresses programmed in the ExCA registers described in this section.

(Table 38 identifies each ExCA register and its respective ExCA offset.) Memory windows have 4K-byte

granularity.

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