參數(shù)資料
型號(hào)： LXT9860HC
英文描述： Controller Miscellaneous - Datasheet Reference
中文描述： 控制器雜項(xiàng)-數(shù)據(jù)表參考
文件頁數(shù)： 26/96頁
文件大小： 1309K
代理商： LXT9860HC
LXT980/980A Dual-Speed, 5-Port Fast Ethernet Repeater
26
Datasheet
When used in 10T applications, the LXT980 sends and receives a non-continuous, 10 Mbaud
Manchester-encoded waveform. To maintain link during idle periods, the LXT980 sends link
pulses every 16 ms, and expects to receive them every 10 to 20 ms. Each 10BASE-T port
automatically detects and sends link pulses, and disables its transmitter if link pulses are not
detected. Each receiver can also be configured to ignore link pulses, and leave its transmitter
enabled all the time (link pulse transmission cannot be disabled). Each 10BASE-T port can detect
and automatically correct for polarity reversal on the TPIP/N inputs. The 10BASE-T interface
provides integrated filters using Intel
’
s patented filter technology. These filters facilitate low-cost
system designs which meet EMI requirements.
In applications where the twisted-pair interface is not used, the inputs and outputs may be left
unconnected.
2.1.3.2
Fiber Interface
Each fiber interface consists of the FIBOP/FIBON (transmit) and FIBIP/FIBIN (receive) signal
pair. Each interface also provides a
“
Signal Detect
”
input which can be tied to the corresponding
output on the fiber transceiver for determining signal quality.
The transmit pair is biased to approximately 1.5V and generally must be AC-coupled to the
transceiver. The receive pair will accommodate an input bias in the 2V- 5V range, and can be DC-
coupled to the transceiver. Refer to
Figure 20 on page 55
for a typical interface circuit.
The fiber interface for each port is enabled when the speed select is set to 100FX, and is disabled in
all other cases. When a fiber port is disabled, its outputs are pulled to ground, and its inputs are tri-
stated. The input and output pins on unused fiber ports may be left unconnected.
Each fiber port transmits and receives a continuous, 1V peak-to-peak, non-scrambled, NRZI
waveform. The LXT980 does not support scrambling or auto-negotiation on the fiber interface.
Remote Fault Reporting
The SD pin detects signal quality and reports a remote fault if the signal quality starts to degrade.
Loss of signal quality also blocks any further data from being received and causes loss of the link.
The remote fault code consists of 84 consecutive 1s followed by a single
‘
0
’
, and is transmitted at
least three times. The LXT980 transmits the remote fault code and sets the associated interrupts
when both of the following conditions are true:
Fiber mode is selected.
Signal Detect indicates no signal, or the receive PLL cannot lock.
2.1.3.3
Media Independent Interface
The LXT980 supports a standard Media Independent Interface (MII). This interface can be
programmed to operate as either the PHY or the MAC side of the interface.
When the MII is operating as the MAC side of the interface (MAC mode), it always operates at
100 Mbps. When the MII is operating as the PHY side of the interface (PHY mode), it can be
programmed to operate either at 10 Mbps or at 100 Mbps. Once the MII is configured, the LXT980
automatically connects it to the corresponding internal repeater.
Note:
The MII does not support auto-negotiation, auto-speed, auto-link, or partition functions.
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