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1 exca identification and revision register – Texas Instruments Dual/Single Socket CardBus and UntraMedia Controller PCI7621 User Manual

Page 133

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5−5

5.1

ExCA Identification and Revision Register

This register provides host software with information on 16-bit PC Card support and 82365SL-DF compatibility. See
Table 5−2 for a complete description of the register contents.

NOTE: If bit 5 (SUBSYRW) in the system control register is 1, then this register is read-only.

Bit

7

6

5

4

3

2

1

0

Name

ExCA identification and revision

Type

R

R

RW

RW

RW

RW

RW

RW

Default

1

0

0

0

0

1

0

0

Register:

ExCA identification and revision

Offset:

CardBus Socket Address + 800h:

Card A ExCA Offset 00h
Card B ExCA Offset 40h

Type:

Read/Write, Read-only

Default: 84h

Table 5−2. ExCA Identification and Revision Register Description

BIT

SIGNAL

TYPE

FUNCTION

7−6 ‡

IFTYPE

R

Interface type. These bits, which are hardwired as 10b, identify the 16-bit PC Card support provided by the
PCI7x21/PCI7x11 controller. The PCI7x21/PCI7x11 controller supports both I/O and memory 16-bit PC
Cards.

5−4 ‡

RSVD

RW

These bits can be used for 82365SL emulation.

3−0 ‡

365REV

RW

82365SL-DF revision. This field stores the Intel 82365SL-DF revision supported by the PCI7x21/PCI7x11
controller. Host software can read this field to determine compatibility to the 82365SL-DF register set. This
field defaults to 0100b upon reset. Writing 0010b to this field places the controller in the 82356SL mode.

‡ These bits are cleared only by the assertion of GRST.