Datasheet

5−5

5.1 ExCA Identification and Revision Register

The ExCA identification and revision register provides host software with information on 16-bit PC Card support and

Intel 82365SL-DF compatibility. This register is read-only or read/write, depending on the setting of bit 5

(SUBSYSRW) in the system control register (PCI offset 80h, see Section 4.29). See Table 5−2 for a complete

description of the register contents.

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

Offset: CardBus socket address + 800h; Card A ExCA offset 00h

Card B ExCA offset 40h

Type: Read-only, Read/Write

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

PCI1520. The PCI1520 supports both I/O and memory 16-bit PC cards.

5−4 RSVD RW Reserved. Bits 5 and 4 can be used for Intel 82365SL-DF emulation.

3−0 365REV RW

Intel 82365SL-DF revision. This field stores the Intel 82365SL-DF revision supported by the PCI1520. Host

software can read this field to determine compatibility to the Intel

82365SL-DF register set. Writing 0010b to

this field puts the controller in 82365SL mode.