PCI1451 Datasheet, PDF (108/141 Pages) Texas Instruments – PC Card Controller

5.16 ExCA Memory Windows 0–4 End-Address High-Byte Registers (Index
13h/1Bh/23h/2Bh/33h)
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.
Bit
7
6
5
4
3
2
1
0
Name
ExCA memory windows 0–4 end-address high-byte
Type
R/W
R/W
R
R
R/W
R/W
R/W
R/W
Default
0
0
0
0
0
0
0
0
Register:
Offset:
Register:
Offset:
Register:
Offset:
Register:
Offset:
Register:
Offset:
Type:
Default:
Size:
ExCA memory window 0 end-address high-byte
CardBus Socket Address + 813h:
Card A ExCA Offset 13h
Card B ExCA Offset 53h
ExCA memory window 1 end-address high-byte
CardBus Socket Address + 81Bh:
Card A ExCA Offset 1Bh
Card B ExCA Offset 5Bh
ExCA memory window 2 end-address high-byte
CardBus Socket Address + 823h:
Card A ExCA Offset 23h
Card B ExCA Offset 63h
ExCA memory window 3 end-address high-byte
CardBus Socket Address + 82Bh:
Card A ExCA Offset 2Bh
Card B ExCA Offset 6Bh
ExCA Memory window 4 end-address high-byte
CardBus Socket Address + 833h:
Card A ExCA Offset 33h
Card B ExCA Offset 73h
Read/Write, Read-only
00h
One byte
Table 5–11. ExCA Memory Windows 0–4 End-Address High-Byte Registers Description
BIT SIGNAL TYPE
FUNCTION
7–6
MEMWS
R/W
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 two bits.
5–4
RSVD
R These bits return 0s when read. Writes have no effect.
3–0
ENDHN
R/W
End address high-nibble. These bits represent the upper address bits A23–A20 of the memory window end
address.
5–18