參數(shù)資料
型號: PCI1410GHK
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): 110/145頁
文件大?。?/td> 606K
代理商: PCI1410GHK
5–16
5.14 ExCA Memory Windows 0–4 Start-Address High-Byte Registers
These registers contain the high nibble of the 16-bit memory window start address for memory windows 0, 1, 2, 3,
and 4. The lower 4 bits of these registers correspond to bits A23–A20 of the start address. In addition, the memory
window data width and wait states are set in this register. See Table 5–11 for a complete description of the register
contents.
Bit
7
6
5
4
3
2
1
0
Name
ExCA memory windows 0–4 start-address high byte
Type
R/W
R/W
R/W
R/W
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:
ExCA memory window 0 start-address high-byte
CardBus socket address + 811h; ExCA offset 11h
ExCA memory window 1 start-address high-byte
CardBus socket address + 819h; ExCA offset 19h
ExCA memory window 2 start-address high-byte
CardBus socket address + 821h; ExCA offset 21h
ExCA memory window 3 start-address high-byte
CardBus socket address + 829h; ExCA offset 29h
ExCA memory window 4 start-address high-byte
CardBus socket address + 831h; ExCA offset 31h
Read/Write
00h
Table 5–11. ExCA Memory Windows 0–4 Start-Address High-Byte Registers
BIT
SIGNAL
TYPE
FUNCTION
7
DATASIZE
R/W
Data size. Bit 7 controls the memory window data width. This bit is encoded as:
0 = Window data width is 8 bits (default).
1 = Window data width is 16 bits.
6
ZEROWAIT
R/W
Zero wait state. Bit 6 controls the memory window wait state for 8- and 16-bit accesses. This wait-state timing
emulates the ISA wait state used by the Intel
82365SL-DF. This bit is encoded as:
0 = 8- and 16-bit cycles have standard length (default).
1 = 8-bit cycles are reduced to equivalent of three ISA cycles.
16-bit cycles are reduced to equivalent of two ISA cycles.
5–4
SCRATCH
R/W
Scratch pad bits. Bits 5 and 4 have no effect on memory window operation.
3–0
STAHN
R/W
Start-address high nibble. Bits 3–0 represent the upper address bits A23–A20 of the memory window
start address.
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