LU3X54FT

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 complete 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. s s s s 100 Mbits/s TX Transceiver s s s s 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 operatio...