LXT9763 View Datasheet(PDF) - Intel

Part Name

Description

Manufacturer

LXT9763

Fast Ethernet 10/100 Hex Transceiver with Full MII

Intel 

LXT9763 — Fast Ethernet 10/100 Hex Transceiver with Full MII

1.0

Functional Description

1.1

1.1.1

1.1.2

Introduction

The LXT9763 six-port Fast Ethernet 10/100 Transceiver supports 10 Mbps and 100 Mbps

networks. It complies with all applicable requirements of IEEE 802.3. Each port directly drives

either a 100BASE-TX line (up to 100 meters) or a 10BASE-T line (up to 185 meters). The

LXT9763 also supports 100BASE-FX operation via a Pseudo-ECL (PECL) interface.

OSP™ Architecture

Intel’s LXT9763 incorporates high-efficiency Optimal Signal Processing™ design techniques,

combining the best properties of digital and analog signal processing to produce a truly optimal

device.

The receiver utilizes decision feedback equalization to increase noise and cross-talk immunity by

as much as 3 dB over an ideal all-analog equalizer. Using OSP mixed-signal processing techniques

in the receive equalizer avoids the quantization noise and calculation truncation errors found in

traditional DSP-based receivers (typically complex DSP engines with A/D converters). This

results in improved receiver noise and cross-talk performance.

The OSP signal processing scheme also requires substantially less computational logic than

traditional DSP-based designs. This lowers power consumption and also reduces the logic

switching noise generated by high-speed DSP engines. This logic switching noise can be a

considerable source of EMI generated on the device’s power supplies.

The OSP-based LXT9763 provides improved data recovery, EMI performance, and power

consumption.

Comprehensive Functionality

The LXT9763 provides six standard Media Independent Interfaces (MIIs) for 10/100 MACs, each

serving an individual network port. The LXT9763 performs all functions of the Physical Coding

Sublayer (PCS) and Physical Media Attachment (PMA) sublayer as defined in the IEEE 802.3

100BASE-X specification. This device also performs all functions of the Physical Media

Dependent (PMD) sublayer for 100BASE-TX connections.

On power-up, the LXT9763 reads its configuration pins to check for forced operation settings. If

not configured for forced operation, each port uses auto-negotiation/parallel detection to

automatically determine line operating conditions. If the PHY device on the other side of the link

supports auto-negotiation, the LXT9763 auto-negotiates with it using Fast Link Pulse (FLP) bursts.

If the PHY partner does not support auto-negotiation, the LXT9763 automatically detects the

presence of either link pulses (10 Mbps PHY) or Idle symbols (100 Mbps PHY) and set its

operating conditions accordingly.

The LXT9763 provides half-duplex and full-duplex operation at 100 Mbps and 10 Mbps.

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Datasheet

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