5.18 ExCA Memory Windows 0−4 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 A25−A20 of the offset address. In addition, the write
protection and common/attribute memory configurations are set in this register. See Table 5−13 for a complete
description of the register contents.
Bit
7
6
5
4
3
2
1
0
Name
Type
Default
ExCA memory window 0−4 offset-address high-byte
RW
0
RW
0
RW
0
RW
0
RW
0
RW
0
RW
0
RW
0
Register:
Offset:
ExCA memory window 0 offset-address high-byte
CardBus Socket Address + 815h:
Card A ExCA Offset 15h
Card B ExCA Offset 55h
Register:
Offset:
ExCA memory window 1 offset-address high-byte
CardBus Socket Address + 81Dh: Card A ExCA Offset 1Dh
Card B ExCA Offset 5Dh
ExCA memory window 2 offset-address high-byte
CardBus Socket Address + 825h: Card A ExCA Offset 25h
Card B ExCA Offset 65h
ExCA memory window 3 offset-address high-byte
CardBus Socket Address + 82Dh: Card A ExCA Offset 2Dh
Card B ExCA Offset 6Dh
ExCA memory window 4 offset-address high-byte
Register:
Offset:
Register:
Offset:
Register:
Offset:
CardBus Socket Address + 835h:
Card A ExCA Offset 35h
Card B ExCA Offset 75h
Type:
Default:
Read/Write
00h
Table 5−13. ExCA Memory Windows 0−4 Offset-Address High-Byte Registers Description
BIT
SIGNAL
TYPE
FUNCTION
Write protect. This bit specifies whether write operations to this memory window are enabled.
This bit is encoded as:
7
WINWP
RW
0 = Write operations are allowed (default).
1 = Write operations are not allowed.
This bit specifies whether this memory window is mapped to card attribute or common memory.
This bit is encoded as:
6
REG
RW
RW
0 = Memory window is mapped to common memory (default).
1 = Memory window is mapped to attribute memory.
Offset-address high byte. These bits represent the upper address bits A25−A20 of the memory window offset
address.
5−0
OFFHB
5−20
TI [ TEXAS INSTRUMENTS ]
