參數(shù)資料
型號(hào)： LU3X31FT
廠商： Lineage Power
英文描述： Single-Port 3 V 10/100 Ethernet Transceiver TX/FX(單端口 3 V 10M位和100M位以太網(wǎng)收發(fā)器)
中文描述： 單端口3伏10/100以太網(wǎng)收發(fā)器德克薩斯州/外匯（單端口3伏1000萬(wàn)位和100米位以太網(wǎng)收發(fā)器）
文件頁(yè)數(shù)： 17/50頁(yè)
文件大小： 633K
代理商： LU3X31FT
Lucent Technologies Inc.
17
Preliminary Data Sheet
July 2000
LU3X31FT Single-Port 3 V
10/100 Ethernet Transceiver TX/FX
Functional Description
(continued)
currently specified for operation over fiber, the far-end
fault indication function (FEFI) provides this capability
for 100Base-FX applications.
A remote fault is an error in the link that one station can
detect while the other cannot. An example of this is a
disconnected wire at a station’s transmitter. This station
will be receiving valid data and detect that the link is
good via the link integrity monitor, but will not be able to
detect that its transmission is not propagating to the
other station. A 100Base-FX station that detects such a
remote fault may modify its transmitted IDLE stream
from all ones to a group of 84 ones followed by a single
0. This is referred to as the FEFI IDLE pattern.
The FEFI function is controlled by bit 11 of register
18h. It is initialized to 1 (enabled) if the FOSEL pin is at
logic high level during powerup or reset. If the FEFI
function is enabled, the LU3X31FT will halt all current
operations and transmit the FEFI IDLE pattern when
FOSD+/FOSD– signal is deasserted following a good
link indication from the link integrity monitor. Transmis-
sion of the FEFI IDLE pattern will continue until
FOSD+/FOSD– signal is asserted. If three or more
FEFI IDLE patterns are detected by the LU3X31FT,
then bit 4 of the basic mode status register (address
01h) is set to one until read by management. Addition-
ally, upon detection of far-end fault, all receive and
transmit MII activity is disabled/ignored.
Carrier Integrity Monitor.
The carrier integrity monitor
(CIM) function protects the repeater from transient con-
ditions that would otherwise cause spurious transmis-
sion due to a faulty link. This function is required for
repeater applications and is not specified for normal
MII applications.
The CIM function is controlled by bit 10 of register 18h.
It is initialized to 1 (enabled) if both the NDRPTR pin
(pin 50) and CIMEN (pin 5) pin are at logic high level
during powerup or reset. If the CIM determines that the
link is unstable, the LU3X31FT will not propagate the
received data or control signaling to the MII and will
ignore data transmitted via the MII. The LU3X31FT will
continue to monitor the receive stream for valid carrier
events. The false carrier counter (address 13h) incre-
ments each time the link is unstable, the FCRS pin (pin
48) stays high as long as error condition exists. Two
back-to-back false carrier events will isolate the PHY,
incrementing the associated isolate counter (address
12h) once.
100Base-TX Transceiver
LU3X31FT implements a TP-PMD compliant trans-
ceiver for 100Base-TX operation. The differential trans-
mit driver is shared by the 10Base-T and 100Base-TX
subsystems. This arrangement results in one device
that uses the same external magnetics for both the
10Base-T and the 100Base-TX transmission with sim-
ple RC component connections. The individually wave-
shaped 10Base-T and 100Base-TX transmit signals
are multiplexed in the transmit output driver.
Transmit Drivers
The LU3X31FT 100Base-TX transmit driver imple-
ments MLT-3 translation and wave-shaping functions.
The rise/fall time of the output signal is closely con-
trolled to conform to the target range specified in the
ANSI TP-PMD standard.
Twisted-Pair Receiver
For 100Base-TX operation, the incoming signal is
detected by the on-chip twisted-pair receiver that com-
prises the differential line receiver, an adaptive equal-
izer, and baseline wander compensation circuits.
The LU3X31FT uses an adaptive equalizer which
changes filter frequency response in accordance with
cable length. The cable length is estimated based on
the incoming signal strength. The equalizer tunes itself
automatically for any cable length to compensate for
amplitude and phase distortions incurred from the
cable.
10Base-T Module
The 10Base-T Transceiver Module is IEEE802.3 com-
pliant. It includes the receiver, transmitter, collision,
heartbeat, loopback, jabber, waveshaper, and link
integrity functions, as defined in the standard. Figure 4
provides an overview for the 10Base-T module.
The LU3X31FT 10Base-T module is comprised of the
following functional blocks:
I
Manchester encoder and decoder
I
Collision detector
I
Link test function
I
Transmit driver and receiver
I
Serial and parallel interface
I
Jabber and SQE test functions
I
Polarity detection and correction
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