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)： 19/50頁(yè)
文件大小： 633K
代理商： LU3X31FT
Lucent Technologies Inc.
19
Preliminary Data Sheet
July 2000
LU3X31FT Single-Port 3 V
10/100 Ethernet Transceiver TX/FX
Functional Description
(continued)
Valid data is considered to be present until the squelch
level has not been generated for a time longer than
200 ns, indicating end of packet. Once good data has
been detected, the squelch levels are reduced to mini-
mize the effect of noise causing premature end of
packet detection. The receive squelch threshold level
can be lowered for use in longer cable applications.
This is achieved by setting bit 11 or register address
1Ah.
Carrier Sense.
Carrier sense (CRS) is asserted due to
receive activity once valid data is detected via the
smart squelch function.
For 10 Mbits/s half-duplex operation, CRS is asserted
during either packet transmission or reception.
For 10 Mbits/s full-duplex operation, the CRS is
asserted only on receive activity. In repeater mode,
CRS is only asserted on receive activity. CRS is deas-
serted following an end of packet.
Collision Detection.
For half-duplex operation, a
10Base-T collision is detected when the receive and
transmit channels are active simultaneously. Collisions
are reported by the COL signal. If the ENDEC is trans-
mitting when a collision is detected, the COL signal
remains set for the duration of the collision.
SQE Test Function.
Approximately 1
μ
s after the
transmission of each packet, a signal quality error
(SQE) signal of approximately 10 bit times is generated
(internally) to indicate successful transmission. SQE is
reported as a pulse on the COL signal. This function
can be disabled by setting bit 12 of register 1Ah. The
SQE test function is disabled in full-duplex mode.
Jabber Function.
The jabber function monitors the
LU3X31FT's output and disables the transmitter if it
attempts to transmit a longer than legal-sized packet. If
TXEN is high for greater than 24 ms, the 10Base-T
transmitter will be disabled and COL will go high.
Once disabled by the jabber function, the transmitter
stays disabled for the entire time that the TXEN signal
is asserted. This signal has to be deasserted for
approximately 256 ms (the unjab time) before the jab-
ber function re-enables the transmit outputs and de-
asserts COL signal.
The jabber function can be disabled by setting bit 10 of
register 1Ah.
Link Test Function.
A link pulse is used to check the
integrity of the connection with the remote end. If valid
link pulses are not received, the link detector disables
the 10Base-T twisted-pair transmitter, receiver, and
collision detection functions.
The link pulse generator produces pulses as defined in
the IEEE 802.3 10Base-T standard. Each link pulse is
nominally 100 ns in duration and is transmitted every
16 ms, in the absence of transmit data.
Automatic Link Polarity Detection.
The LU3X31FT's
10Base-T Transceiver Module incorporates an auto-
matic link polarity detection circuit. The inverted polar-
ity is determined when seven consecutive link pulses of
inverted polarity or three consecutive receive packets
are received with inverted end of packet pulses. If the
input polarity is reversed, the error condition will be
automatically corrected and reported in bit 15 of regis-
ter 1Ch.
The automatic link polarity detection function can be
disabled by setting bit 3 of register 1Ah.
Clock Synthesizer
The LU3X31FT implements a clock synthesizer that
generates all the reference clocks needed from a sin-
gle external frequency source. The clock source can be
a quartz crystal or a TTL level signal at 25 MHz ±
50 ppm, as shown in Figure 15.
Autonegotiation
The autonegotiation function provides a mechanism for
exchanging configuration information between two
ends of a link segment and automatically selecting the
highest-performance mode of operation supported by
both devices. Fast link pulse (FLP) bursts provide the
signaling used to communicate autonegotiation abili-
ties between two devices at each end of a link seg-
ment. For further detail regarding autonegotiation, refer
to Clause 28 of the IEEE 802.3u specification. The
LU3X31FT supports four different Ethernet protocols,
so the inclusion of autonegotiation ensures that the
highest-performance protocol will be selected based
on the ability of the link partner.
The autonegotiation function within the LU3X31FT can
be controlled either by internal register access or by
the use of configuration pins. At powerup and at device
reset, the configuration pins are sampled. If disabled,
autonegotiation will not occur until software enables bit
12 in register 0. If autonegotiation is enabled, the nego-
tiation process will commence immediately.
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