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5.23 ExCA Memory Windows 0−4 Page Registers
The upper 8 bits of a 4-byte PCI memory address are compared to the contents of this register when decoding
addresses for 16-bit memory windows. Each window has its own page register, all of which default to 00h. By
programming this register to a nonzero value, host software can locate 16-bit memory windows in any one of 256
16-Mbyte regions in the 4-gigabyte PCI address space. These registers are only accessible when the ExCA registers
are memory-mapped, that is, these registers may not be accessed using the index/data I/O scheme.
Bit 7 6 5 4 3 2 1 0
Name ExCA memory windows 0−4 page
Type RW RW RW RW RW RW RW R
Default 0 0 0 0 0 0 0 0
Register: ExCA memory windows 0−4 page
Offset: CardBus Socket Address + 840h, 841h, 842h, 843h, 844h
Type: Read/Write
Default: 00h