PCI4450 datasheet(101/197 Pages) TI

101 / 197 page

PCI4450 GFN/GJG

PC Card and OHCI Controller

SCPS046 – JANUARY 1999

101

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

ExCA memory window 0–4 offset-address high-byte register (15h/1Dh/25h/2Dh/35h)

Bit

Name

ExCA memory window 0–4 offset-address high-byte

Type

R/W

Default

ExCA memory window 0 offset-address high-byte

Offset:

CardBus Socket Address + 815h:

Card A ExCA Offset 15h

Card B ExCA Offset 55h

ExCA memory window 1 offset-address high-byte

Offset:

CardBus Socket Address + 81Dh:

Card A ExCA Offset 1Dh

Card B ExCA Offset 5Dh

ExCA memory window 2 offset-address high-byte

Offset:

CardBus Socket Address + 825h:

Card A ExCA Offset 25h

Card B ExCA Offset 65h

ExCA memory window 3 offset-address high-byte

Offset:

CardBus Socket Address + 82Dh:

Card A ExCA Offset 2Dh

Card B ExCA Offset 6Dh

ExCA memory window 4 offset-address high-byte

Offset:

CardBus Socket Address + 835h:

Card A ExCA Offset 35h

Card B ExCA Offset 75h

Type:

Read/Write

Default:

00h

Size:

One byte

Description: These registers contain the high 6 bits of the 16-bit memory window offset address for

memory windows 0, 1, 2, 3, and 4. The lower 6 bits of these registers correspond to bits

A25–A20 of the offset address. In addition, the write protection and common/attribute

memory configurations are set in this register.

Table 60. ExCA Memory Window 0–4 Offset-Address High-Byte Register Description

BIT

TYPE

FUNCTION

R/W

WINWP. Write protect. This bit specifies whether write operations to this memory window are enabled.

This bit is encoded as:

0 = Write operations are allowed (default)

1 = Write operations are not allowed

R/W

REG. This bit specifies whether this memory window is mapped to card attribute or common memory.

This bit is encoded as:

0 = Memory window is mapped to common memory (default)

1 = Memory window is mapped to attribute memory

5–0

R/W

OFFHB. Offset address high-byte. These bits represent the upper address bits A25–A20 of the memory window offset

address.

PCI4450 Datasheet(PDF) 101 Page - Texas Instruments

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