参数资料
型号: ZL50418GKG2
厂商: CONEXANT SYSTEMS
元件分类: 网络接口
英文描述: DATACOM, LAN SWITCHING CIRCUIT, PBGA553
封装: 37.50 X 37.50 MM, 2.33 MM HEIGHT, LEAD FREE, MS-034, HSBGA-553
文件页数: 96/155页
文件大小: 1928K
代理商: ZL50418GKG2
ZL50418
Data Sheet
45
Zarlink Semiconductor Inc.
3.3.1.5
Data
After the first byte containing the address, all bytes that follow are data bytes. Each byte must be followed by an
acknowledge bit. Data is transferred MSB first.
3.3.1.6
Stop Condition
Generated by the master. The bus is considered to be free after the Stop condition is generated. The Stop condition
occurs if while the SCL line is High, there is a Low-to-High transition of the SDA line.
3.3.2
Synchronous Serial Interface
The synchronous serial interface (SSI) serves the function of configuring the ZL50418, not at boot time, but via a
PC. The PC serves as master and the ZL50418 serves as slave. The protocol for the synchronous serial interface
is nearly identical to the I2C protocol. The main difference is that there is no acknowledgment bit after each byte of
data transferred.
The unmanaged ZL50418 uses a synchronous serial interface to program the internal registers. To reduce the
number of signals required, the register address, command and data are shifted in serially through the D0 pin.
STROBE pin is used as the shift clock. AUTOFD pin is used as data return path.
Each command consists of four parts.
START pulse
Register Address
Read or Write command
Data to be written or read back
Any command can be aborted in the middle by sending a ABORT pulse to the ZL50418.
A START command is detected when D0 is sampled high when STROBE rise and D0 is sampled low when
STROBE fall.
An ABORT command is detected when D0 is sampled low when STROBE rise and D0 is sampled high when
STROBE fall.
All registers in ZL50418 can be modified through this synchronous serial interface.
3.3.2.1
Write Command
STROBE-
D0
A0
A2
...
A9
A10
A11
A1
W
D0 D1 D2 D3 D4 D5 D6 D7
START
ADDRESS
COMMAND
DATA
2 Extra clocks after last
transfer
2 extra clock cycles after
last transfer
A9 A10 A11
A0 A1 A2
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