
ExCA Compatibilty Registers (Function 0)
122
September 2005
SCPS110
5.18 ExCA Memory Windows 04 Offset-Address High-Byte Registers
These registers contain the high 6 bits of the 16-bit memory window offset address for memory windows 0,
1, 2, 3, and 4. The lower 6 bits of these registers correspond to bits A25A20 of the offset address. In addition,
the write protection and common/attribute memory configurations are set in this register. See Table 513 for
a complete description of the register contents.
Register:
ExCA memory window 0 offset-address high-byte
ExCA register offset:
CardBus Socket Address + 815h: Card A ExCA Offset 15h
Register:
ExCA memory window 1 offset-address high-byte
ExCA register offset:
CardBus Socket Address + 81Dh: Card A ExCA Offset 1Dh
Register:
ExCA memory window 2 offset-address high-byte
ExCA register offset:
CardBus Socket Address + 825h: Card A ExCA Offset 25h
Register:
ExCA memory window 3 offset-address high-byte
ExCA register offset:
CardBus Socket Address + 82Dh: Card A ExCA Offset 2Dh
Register:
ExCA memory window 4 offset-address high-byte
ExCA register offset:
CardBus Socket Address + 835h: Card A ExCA Offset 35h
Register type:
Read/Write
Default value:
00h
BIT NUMBER
7
6
5
4
3
2
1
0
RESET STATE
0
Table 513. ExCA Memory Windows 04 Offset-Address High-Byte Registers Description
BIT
SIGNAL
TYPE
FUNCTION
7
WINWP
RW
Write protect. This bit specifies whether write operations to this memory window are enabled.
This bit is encoded as:
0 = Write operations are allowed (default).
1 = Write operations are not allowed.
6
REG
RW
This bit specifies whether this memory window is mapped to card attribute or common memory.
This bit is encoded as:
0 = Memory window is mapped to common memory (default).
1 = Memory window is mapped to attribute memory.
50
OFFHB
RW
Offset-address high byte. These bits represent the upper address bits A25A20 of the memory window offset
address.