參數(shù)資料
型號： PCI1520I
廠商： Texas Instruments, Inc.
英文描述： PC CARD CONTROLLERS
中文描述： PC卡控制器
文件頁數(shù)： 114/138頁
文件大?。?/td> 745K
代理商： PCI1520I
518
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.
Bit
7
6
5
4
3
2
1
0
Name
ExCA memory windows 04 end-address high-byte
Type
RW
RW
R
R
RW
RW
RW
RW
Default
0
0
0
0
0
0
0
0
Register:
Offset:
ExCA memory window 0 end-address high-byte
CardBus socket address + 813h; Card A ExCA offset 13h
Card B ExCA offset 53h
Register:
Offset:
ExCA memory window 1 end-address high-byte
CardBus socket address + 81Bh; Card A ExCA offset 1Bh
Card B ExCA offset 5Bh
Register:
Offset:
ExCA memory window 2 end-address high-byte
CardBus socket address + 823h; Card A ExCA offset 23h
Card B ExCA offset 63h
Register:
Offset:
ExCA memory window 3 end-address high-byte
CardBus socket address + 82Bh; Card A ExCA offset 2Bh
Card B ExCA offset 6Bh
Register:
Offset:
ExCA memory window 4 end-address high-byte
CardBus socket address + 833h; Card A ExCA offset 33h
Card B ExCA offset 73h
Type:
Default:
Read-only, Read/Write
00h
Table 512. ExCA Memory Windows 04 End-Address High-Byte Registers Description
BIT
SIGNAL
TYPE
FUNCTION
76
MEMWS
RW
Wait state. Bits 7 and 6 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.
54
RSVD
R
Reserved. Bits 5 and 4 return 0s when read.
30
ENDHN
RW
End-address high nibble. Bits 30 represent the upper address bits A23A20 of the memory window end
address.
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