Description

The LU6612 is a single-channel, single-chip complete transceiver designed specifically for dual-speed 10Base-T and 100Base-TX repeaters and switches.

LU6612 implements:

■ The 10Base-T transceiver function of IEEE 802.3u.

■ The physical coding sublayer (PCS) of IEEE 802.3u.

■ The 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 802.3u.

Features

10 Mbits/s Transceiver

■ Compatible with IEEE * 802.3u 10Base-T standard for twisted-pair cable

■ Autopolarity detection and correction

■ Adjustable squelch level for extended wire line length capability (2 levels)

■ Interfaces with IEEE 802.3u media independent interface (MII)

■ On-chip filtering eliminates the need for external filters

■ Half- and full-duplex operations

100 Mbits/s Transceiver

■ 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

■ Half- or full-duplex operations

■ On-chip filtering and adaptive equalization that eliminates the need for external filters

General

■ Autonegotiation (IEEE 802.3u clause 28):

— Fast link pulse (FLP) burst generator

— Arbitration function

— Accepts preamble suppression

— Operates up to 12.5 MHz

■ Supports the station management protocol and frame format (clause 22):

— Basic and extended registers

— Supports next-page function

— Accepts preamble suppression

— Operates up to 12.5 MHz

■ Supports the following management functions via pins if station management is unavailable:

— Speed select

— Encoder/decoder bypass

— Scrambler/descrambler bypass

— Full duplex

— Autonegotiation

■ Supports half- and full-duplex operations

■ Provides four status signals: receive/transmit activity, full duplex, link integrity, and speed indication

■ Powerdown mode for 10 Mbits/s and 100 Mbits/s operation

■ Loopback for 10 Mbits/s and 100 Mbits/s operation

■ 0.35 µm low-power CMOS technology

■ 64-pin TQFP

■ Single 5 V power supply