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5−18
5.16 ExCA Memory Windows 0−4 End-Address High-Byte Registers
These registers contain the high nibble of the 16-bit memory window end address for memory windows 0, 1, 2, 3,
and 4. The lower 4 bits of these registers correspond to bits A23−A20 of the end address. In addition, the memory
window wait states are set in this register. See Table 5−12 for a complete description of the register contents.
Bit 7 6 5 4 3 2 1 0
Name ExCA memory windows 0−4 end-address high-byte
Type RW RW R R RW RW RW RW
Default 0 0 0 0 0 0 0 0
Register: ExCA memory window 0 end-address high-byte
Offset: CardBus Socket Address + 813h: Card A ExCA Offset 13h
Card B ExCA Offset 53h
Register: ExCA memory window 1 end-address high-byte
Offset: CardBus Socket Address + 81Bh: Card A ExCA Offset 1Bh
Card B ExCA Offset 5Bh
Register: ExCA memory window 2 end-address high-byte
Offset: CardBus Socket Address + 823h: Card A ExCA Offset 23h
Card B ExCA Offset 63h
Register: ExCA memory window 3 end-address high-byte
Offset: CardBus Socket Address + 82Bh: Card A ExCA Offset 2Bh
Card B ExCA Offset 6Bh
Register: ExCA Memory window 4 end-address high-byte
Offset: CardBus Socket Address + 833h: Card A ExCA Offset 33h
Card B ExCA Offset 73h
Type: Read/Write, Read-only
Default: 00h
Table 5−12. ExCA Memory Windows 0−4 End-Address High-Byte Registers Description
BIT SIGNAL TYPE FUNCTION
7−6 MEMWS RW
Wait state. These bits specify the number of equivalent ISA wait states to be added to 16-bit memory
accesses. The number of wait states added is equal to the binary value of these 2 bits.
5−4 RSVD R Reserved. These bits return 0s when read. Writes have no effect.
3−0 ENDHN RW
End-address high nibble. These bits represent the upper address bits A23−A20 of the memory window end
address.