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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 PCI7x21/PCI7x11 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 ExCA address window enable
Type RW RW R RW RW RW RW RW
Default 0 0 0 0 0 0 0 0
Register: 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
7 IOWIN1EN RW
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
6 IOWIN0EN RW
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
5 RSVD R Reserved. Bit 5 returns 0 when read.
4 MEMWIN4EN RW
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
3 MEMWIN3EN RW
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
2 MEMWIN2EN RW
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
1 MEMWIN1EN RW
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
0 MEMWIN0EN RW
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