PCI7421 datasheet(133/298 Pages) TI

133 / 298 page

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

Name

ExCA identification and revision

Type

Default

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

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

These bits can be used for 82365SL emulation.

3−0 ‡

365REV

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.

PCI7421 Datasheet(PDF) 133 Page - Texas Instruments