PCI6621 datasheet(137/204 Pages) TI

137 / 204 page

6−1

6 CardBus Socket Registers (Functions 0 and 1)

The 1997 PC Card Standard requires a CardBus socket controller to provide five 32-bit registers that report and

control socket-specific functions. The PCI6x21/PCI6x11 controller provides the CardBus socket/ExCA base address

Each function has a separate base address register for accessing the CardBus socket registers (see Figure 6−1).

Table 6−1 gives the location of the socket registers in relation to the CardBus socket/ExCA base address.

In addition to the five required registers, the PCI6x21/PCI6x11 controller implements a register at offset 20h that

provides power management control for the socket.

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

PCI6x21/PCI6x11 Configuration Registers

Offset

Figure 6−1. Accessing CardBus Socket Registers Through PCI Memory

Table 6−1. CardBus Socket Registers

OFFSET

Socket event †

00h

Socket mask †

04h

Socket present state †

08h

Socket force event

0Ch

Socket control †

10h

Reserved

14h−1Ch

Socket power management ‡

20h

† One or more bits in the register are PME context bits and can be cleared only by the assertion of GRST when PME is enabled. If PME is not

enabled, then these bits are cleared by the assertion of PRST or GRST.

‡ One or more bits in this register are cleared only by the assertion of GRST.

PCI6621 Datasheet(PDF) 137 Page - Texas Instruments

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