參數(shù)資料
型號(hào)： LXT9860AHC
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(yè)數(shù)： 25/96頁(yè)
文件大小： 1309K
代理商： LXT9860AHC
LXT980/980A Dual-Speed, 5-Port Fast Ethernet Repeater
Datasheet
25
Disable the port(s) to be changed.
Set Port Speed Control Register to desired speed.
Perform a repeater reset (LXT980 will not read hardware configuration pins. Refer to
Table 69
on page 88
.)
Re-enable the port(s).
Note:
The entire repeater must be reset in order to change the port speed on any port.
2.1.2
MII Port Configuration
At power-up or reset, the MII is configured via external pins to one of the three modes of operation:
100 Mbps, PHY side of interface
—
for interfacing to 100 Mbps MAC.
10 Mbps, PHY side of interface
—
for interfacing to 10 Mbps MAC.
100 Mbps, MAC side of interface
—
to drive fifth 100 Mbps port via an LXT970 or other MII-
compliant PHY. In this mode, the external PHY must be configured as either a 100-TX or 100-
FX connection.
2.1.3
Interface Descriptions
The LXT980 provides four network interface ports. Each port provides both a twisted-pair and a
fiber interface. The twisted-pair interface directly supports 100BASE-TX (100TX) and 10BASE-T
(10T) Ethernet applications. A common termination circuit is used for both media types. The fiber
interface indirectly supports 100BASE-FX (100FX) media through a PECL connection to an
external fiber-optic transceiver. Both interfaces fully comply with IEEE 802.3 standards.
2.1.3.1
Twisted-Pair Interface
The twisted-pair interface for each port consists of two differential signal pairs
—
one for transmit
and one for receive. The transmit signal pair is TPOP/TPON, the receive signal pair is TPIP/TPIN.
The twisted-pair interface for a given port is enabled when the port configuration is set to auto-
negotiate, forced 10T or forced 100TX operation. The twisted-pair interface is disabled when
100FX is selected.
The transmitter is current driven and requires magnetics with 2:1 turns ratio. A 400
resistive load
should be placed across the TPOP/N pair, in parallel with the magnetics. The center tap of the
primary side of the transmit winding must be tied to a quiet VCC for proper operation. When the
twisted-pair interface is disabled, the transmitter outputs are tri-stated.
The receiver requires magnetics with a 1:1 turns ratio, and a load of 100
. When the twisted-pair
port is enabled, the receiver actively biases its inputs to approximately 2.8V. When the twisted-pair
interface is disabled, no biasing is provided. A 4 k
load is always present across the TPIP/TPIN
pair.
When used in 100TX applications, the LXT980 sends and receives a continuous, scrambled
125 Mbaud MLT-3 waveform on this interface. In the absence of data, IDLE symbols are sent and
received in order to keep the link up.
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