PCI6421 datasheet(123/204 Pages) TI

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5−11

5.7

ExCA Address Window Enable Register

The ExCA address window enable register enables/disables the memory and I/O windows to the 16-bit PC Card. By

default, all windows to the card are disabled. The PCI6x21/PCI6x11 controller does not acknowledge PCI memory

or I/O cycles to the card if the corresponding enable bit in this register is 0, regardless of the programming of the

memory or I/O window start/end/offset address registers. See Table 5−9 for a complete description of the register

contents.

Bit

Name

ExCA address window enable

Type

Default

ExCA address window enable

Type:

Read-only, Read/Write

Offset:

CardBus socket address + 806h; Card A ExCA offset 06h

Card B ExCA offset 46h

Default:

00h

Table 5−9. ExCA Address Window Enable Register Description

BIT

SIGNAL

TYPE

FUNCTION

IOWIN1EN

I/O window 1 enable. Bit 7 enables/disables I/O window 1 for the PC Card. This bit is encoded as:

0 = I/O window 1 disabled (default)

1 = I/O window 1 enabled

IOWIN0EN

I/O window 0 enable. Bit 6 enables/disables I/O window 0 for the PC Card. This bit is encoded as:

0 = I/O window 0 disabled (default)

1 = I/O window 0 enabled

RSVD

Reserved. Bit 5 returns 0 when read.

MEMWIN4EN

Memory window 4 enable. Bit 4 enables/disables memory window 4 for the PC Card. This bit is

encoded as:

0 = Memory window 4 disabled (default)

1 = Memory window 4 enabled

MEMWIN3EN

Memory window 3 enable. Bit 3 enables/disables memory window 3 for the PC Card. This bit is

encoded as:

0 = Memory window 3 disabled (default)

1 = Memory window 3 enabled

MEMWIN2EN

Memory window 2 enable. Bit 2 enables/disables memory window 2 for the PC Card. This bit is

encoded as:

0 = Memory window 2 disabled (default)

1 = Memory window 2 enabled

MEMWIN1EN

Memory window 1 enable. Bit 1 enables/disables memory window 1 for the PC Card. This bit is

encoded as:

0 = Memory window 1 disabled (default)

1 = Memory window 1 enabled

MEMWIN0EN

Memory window 0 enable. Bit 0 enables/disables memory window 0 for the PC Card. This bit is

encoded as:

0 = Memory window 0 disabled (default)

1 = Memory window 0 enabled

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