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參數資料
| 型號： | AD9558/PCBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 55/104頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR AD9558 |
| 產品變化通告： | AD9558 Minor Metal Mask Change 17/Apr/2012 |
| 設計資源： | AD9558 Eval Brd BOM AD9558 Schematic |
| 標準包裝： | 1 |
| 系列： | * |
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AD9558
Data Sheet
Rev. B | Page 54 of 104
Data Transfer Process
The master initiates data transfer by asserting a start condition.
This indicates that a data stream follows. All IC slave devices
connected to the serial bus respond to the start condition.
The master then sends an 8-bit address byte over the SDA line,
consisting of a 7-bit slave address (MSB first) plus an R/
AA
WEE
AA
bit.
This bit determines the direction of the data transfer, that is,
whether data is written to or read from the slave device (0 =
write, 1 = read).
The peripheral whose address corresponds to the transmitted
address responds by sending an acknowledge bit. All other
devices on the bus remain idle while the selected device waits
for data to be read from or written to it. If the R/
AA
WEE
AA
bit is 0, the
master (transmitter) writes to the slave device (receiver). If the
R/
AA
WEE
AA
bit is 1, the master (receiver) reads from the slave device
(transmitter).
The format for these commands is described in the Data Transfer
Format section.
Data is then sent over the serial bus in the format of nine clock
pulses, one data byte (eight bits) from either master (write mode)
or slave (read mode) followed by an acknowledge bit from the
receiving device. The number of bytes that can be transmitted
per transfer is unrestricted. In write mode, the first two data
bytes immediately after the slave address byte are the internal
memory (control registers) address bytes, with the high address
byte first. This addressing scheme gives a memory address of up
to 216 1 = 65,535. The data bytes after these two memory address
bytes are register data written to or read from the control registers.
In read mode, the data bytes after the slave address byte are
register data written to or read from the control registers.
When all data bytes are read or written, stop conditions are
established. In write mode, the master (transmitter) asserts
a stop condition to end data transfer during the 10th clock pulse
following the acknowledge bit for the last data byte from the slave
device (receiver). In read mode, the master device (receiver)
receives the last data byte from the slave device (transmitter) but
does not pull SDA low during the ninth clock pulse. This is known
as a nonacknowledge bit. By receiving the nonacknowledge bit,
the slave device knows that the data transfer is finished and
enters idle mode. The master then takes the data line low
during the low period before the 10th clock pulse, and high
during the 10th clock pulse to assert a stop condition.
A start condition can be used in place of a stop condition.
Furthermore, a start or stop condition can occur at any time,
and partially transferred bytes are discarded.
1
2
8
9
1
2
3 TO 7
8
9
10
ACK FROM
SLAVE RECEIVER
ACK FROM
SLAVE RECEIVER
SDA
SCL
S
MSB
P
09758-
038
Figure 55. Data Transfer Process (Master Write Mode, 2-Byte Transfer)
1
2
8
9
1
2
3 TO 7
8
9
10
ACK FROM
MASTER RECEIVER
NON-ACK FROM
MASTER RECEIVER
SDA
SCL
S
P
09758-
039
Figure 56. Data Transfer Process (Master Read Mode, 2-Byte Transfer)
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD9559 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual PLL, Quad Input, Multiservice Line Card Adaptive Clock Translator |
| AD9559/PCBZ | 功能描述:時鐘和定時器開發(fā)工具 Multi-protocol line card dual clock RoHS:否 制造商:Texas Instruments 產品:Evaluation Modules 類型:Clock Conditioners 工具用于評估:LMK04100B 頻率:122.8 MHz 工作電源電壓:3.3 V |
| AD9559BCPZ | 功能描述:時鐘發(fā)生器及支持產品 Multi-protocol line card dual clock RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56 |
| AD9559BCPZ-REEL7 | 功能描述:時鐘發(fā)生器及支持產品 Multi-protocol line card dual clock RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56 |
| AD9559PCBZ | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual PLL, Quad Input, Multiservice Line Card Adaptive Clock Translator |
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