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| 型號： | PCI1520-EP |
| 英文描述： | Military Enhanced Plastic PC Card Controllers Data Manual |
| 中文描述： | 軍事增強塑料PC卡控制器數(shù)據(jù)手冊 |
| 文件頁數(shù)： | 86/125頁 |
| 文件大?。?/td> | 716K |
| 代理商： | PCI1520-EP |
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4
–
33
4.46 Serial-Bus Index Register
The serial-bus index register is for programmable serial-bus byte reads and writes. This register represents the byte
address when generating cycles on the serial-bus interface. To write a byte, the serial-bus data register must be
programmed with the data, this register must be programmed with the byte address, and the serial-bus slave address
register must be programmed with both the 7-bit slave address and the read/write indicator bit.
On byte reads, the word address is programmed into this register
,
the serial-bus slave address must be programmed
with both the 7-bit slave address and the read/write indicator bit, and bit 5 (REQBUSY) in the serial-bus control and
status register (see Section 4.48) must be polled until clear. Then the contents of the serial-bus data register are valid
read data from the serial-bus interface. See Table 4
–
22 for a complete description of the register contents.
Bit
7
6
5
4
3
2
1
0
Name
Serial-bus index
Type
RW
RW
RW
RW
RW
RW
RW
RW
Default
0
0
0
0
0
0
0
0
Register:
Offset:
Type:
Default:
Serial-bus index
B1h (function 0)
Read/Write
00h
Table 4
–
22. Serial-Bus Index Register Description
BIT
SIGNAL
TYPE
FUNCTION
7
–
0
SBINDEX
RW
Serial-bus index. This bit field represents the byte address in a read or write transaction on the serial interface.
4.47 Serial-Bus Slave Address Register
The serial-bus slave address register is for programmable serial-bus byte read and write transactions. To write a byte,
the serial-bus data register must be programmed with the data, the serial-bus index register must be programmed
with the byte address, and this register must be programmed with both the 7-bit slave address and the read/write
indicator bit.
On byte reads, the byte address is programmed into the serial bus index register
,
this register must be programmed
with both the 7-bit slave address and the read/write indicator bit, and bit 5 (REQBUSY) in the serial-bus control and
status register (PCI offset B3h, see Section 4.48) must be polled until clear. Then the contents of the serial-bus data
register are valid read data from the serial-bus interface. See Table 4
–
23 for a complete description of the register
contents.
Bit
7
6
5
4
3
2
1
0
Name
Serial-bus slave address
Type
RW
RW
RW
RW
RW
RW
RW
RW
Default
0
0
0
0
0
0
0
0
Register:
Offset:
Type:
Default:
Serial-bus slave address
B2h (function 0)
Read/Write
00h
Table 4
–
23. Serial-Bus Slave Address Register Description
BIT
SIGNAL
TYPE
FUNCTION
7
–
1
SLAVADDR
RW
Serial-bus slave address. This bit field represents the slave address of a read or write transaction on the
serial interface.
0
RWCMD
RW
Read/write command. Bit 0 indicates the read/write command bit presented to the serial bus on byte read
and write accesses.
0 = A byte write access is requested to the serial bus interface.
1 = A byte read access is requested to the serial bus interface.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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