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
7
6
5
4
3
2
1
0
Name
Type
Default
ExCA address window enable
RW
0
RW
0
R
0
RW
0
RW
0
RW
0
RW
0
RW
0
Register:
Type:
ExCA address window enable
Read-only, Read/Write
Offset:
CardBus socket address + 806h; Card A ExCA offset 06h
Card B ExCA offset 46h
00h
Default:
Table 5−9. ExCA Address Window Enable Register Description
BIT
SIGNAL
TYPE
FUNCTION
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)
7
IOWIN1EN
RW
1 = I/O window 1 enabled
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)
6
5
IOWIN0EN
RSVD
RW
R
1 = I/O window 0 enabled
Reserved. Bit 5 returns 0 when read.
Memory window 4 enable. Bit 4 enables/disables memory window 4 for the PC Card. This bit is
encoded as:
4
3
2
1
0
MEMWIN4EN
MEMWIN3EN
MEMWIN2EN
MEMWIN1EN
MEMWIN0EN
RW
RW
RW
RW
RW
0 = Memory window 4 disabled (default)
1 = Memory window 4 enabled
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
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
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
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
5−11
TI [ TEXAS INSTRUMENTS ]
