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LU3X54FT Datasheet

  • LU3X54FT

  • QUAD-FET (Fast Ethernet Transceiver) for 10Base-T/100Base-TX...

  • 628.05KB

  • 54頁

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Data Sheet
July 2000
LU3X54FT
QUAD-FET (Fast Ethernet Transceiver) for 10Base-T/100Base-TX/FX
Introduction
The LU3X54FT is a four-channel, single-chip com-
plete transceiver designed specifically for dual-speed
10Base-T, 100Base-TX, and 100Base-FX repeaters
and switches. It supports simultaneous operation in
three separate
IEEE
standard modes: 10Base-T,
100Base-TX, and 100Base-FX.
Each channel implements:
s
s
s
s
s
Autopolarity detection and correction
Adjustable squelch level for extended line length
capability (two levels)
Interfaces with
IEEE
802.3u media independent
interface (MII) or a serial 10 Mbits/s 7-pin interface
On-chip filtering eliminates the need for external
filters
Half- and full-duplex operations
s
s
s
10Base-T transceiver function of
IEEE
802.3.
Physical coding sublayer (PCS) of
IEEE
802.3u.
Physical medium attachment (PMA) of
IEEE
802.3u.
Autonegotiation of
IEEE
802.3u.
MII management of
IEEE
802.3u.
Physical medium dependent (PMD) of
IEEE
802.3.
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s
s
s
100 Mbits/s TX Transceiver
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Compatible with
IEEE
802.3u MII (clause 22), PCS
(clause 23), PMA (clause 24), autonegotiation
(clause 28), and PMD (clause 25) specifications
Scrambler/descrambler bypass
Encoder/decoder bypass
3-statable MII in 100 Mbits/s mode
Selectable carrier sense signal generation (CRS)
asserted during either transmission or reception in
half duplex (CRS asserted during reception only in
full duplex)
Selectable MII or 5-bit code group interface
Full- or half-duplex operations
Optional carrier integrity monitor (CIM)
On-chip filtering and adaptive equalization that
eliminates the need for external filters
The LU3X54FT supports operations over two pairs of
unshielded twisted-pair (UTP) cable (10Base-T and
100Base-TX), and over fiber-optic cable (100Base-
FX).
It has been designed with a flexible system interface
that allows configuration for optimum performance
and effortless design. The individual per-port inter-
face can be configured as 100 Mbits/s MII, 10 Mbits/s
MII, 7-pin 10 Mbits/s serial, or bused mode.
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Features
10 Mbits/s Transceiver
s
Compatible with
IEEE
* 802.3 10Base-T standard
for twisted-pair cable
*
IEEE
is a registered trademark of The Institute of Electrical and Electronics Engineers, Inc.
Note: Advisories are issued as needed to update product information. When using this data sheet for design purposes, please contact
your Lucent Technologies Microelectronics Group Account Manager to obtain the latest advisory on this product.

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