
ExCA Compatibilty Registers (Function 0)
121
September 2005
SCPS110
5.16 ExCA Memory Windows 04 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 A23A20 of the end address. In addition,
the memory window wait states are set in this register. See Table 512 for a complete description of the
register contents.
Register:
ExCA memory window 0 end-address high-byte
ExCA register offset:
CardBus Socket Address + 813h: Card A ExCA Offset 13h
Register:
ExCA memory window 1 end-address high-byte
ExCA register offset:
CardBus Socket Address + 81Bh: Card A ExCA Offset 1Bh
Register:
ExCA memory window 2 end-address high-byte
ExCA register offset:
CardBus Socket Address + 823h: Card A ExCA Offset 23h
Register:
ExCA memory window 3 end-address high-byte
ExCA register offset:
CardBus Socket Address + 82Bh: Card A ExCA Offset 2Bh
Register:
ExCA Memory window 4 end-address high-byte
ExCA register offset:
CardBus Socket Address + 833h: Card A ExCA Offset 33h
Register type:
Read/Write, Read-only
Default value:
00h
BIT NUMBER
7
6
5
4
3
2
1
0
RESET STATE
0
Table 512. ExCA Memory Windows 04 End-Address High-Byte Registers Description
BIT
SIGNAL
TYPE
FUNCTION
76
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.
54
RSVD
R
Reserved. These bits return 00b when read. Writes have no effect.
30
ENDHN
RW
End-address high nibble. These bits represent the upper address bits A23A20 of the memory window end
address.
5.17 ExCA Memory Windows 04 Offset-Address Low-Byte Registers
These registers contain the low byte of the 16-bit memory window offset address for memory windows 0, 1,
2, 3, and 4. The 8 bits of these registers correspond to bits A19A12 of the offset address.
Register:
ExCA memory window 0 offset-address low-byte
ExCA register offset:
CardBus Socket Address + 814h: Card A ExCA Offset 14h
Register:
ExCA memory window 1 offset-address low-byte
ExCA register offset:
CardBus Socket Address + 81Ch: Card A ExCA Offset 1Ch
Register:
ExCA memory window 2 offset-address low-byte
ExCA register offset:
CardBus Socket Address + 824h: Card A ExCA Offset 24h
Register:
ExCA memory window 3 offset-address low-byte
ExCA register offset:
CardBus Socket Address + 82Ch: Card A ExCA Offset 2Ch
Register:
ExCA memory window 4 offset-address low-byte
ExCA register offset:
CardBus Socket Address + 834h: Card A ExCA Offset 34h
Register type:
Read/Write
Default value:
00h
BIT NUMBER
7
6
5
4
3
2
1
0
RESET STATE
0