General Description

The DP83843BVJE is a full feature Physical Layer device

with integrated PMD sublayers to support both 10BASE-T

and 100BASE-X Ethernet protocols.

This VLSI device is designed for easy implementation of

10/100 Mb/s Ethernet LANs. It interfaces directly to Twisted

Pair media through an external transformer or to fiber

media via industry standard electrical/optical fiber PMD

transceivers. This device also interfaces directly to the

MAC layer through the IEEE 802.3u standard Media Independent

Interface (MII), ensuring interoperability between

products from different vendors.

The DP83843 is designed with National Semiconductor's

advanced CMOS process. Its system architecture is based

on the integration of several of National's industry proven

core technologies:

—IEEE 802.3 ENDEC with AUI/10BASE-T transceiver

module to provide the 10 Mb/s functions

—Clock Recovery/Generator Modules fromNational's Fast

Ethernet and FDDI products

—FDDI Stream Cipher scrambler/descrambler for

TP-PMD

—100BASE-Xphysical codingsub-layer (PCS) andcontrol

logic that integrates the core modules into a dual speed

Ethernet physical layer controller

—ANSI X3T12 Compliant TP-PMD Transceiver

technology with Baseline Wander (BLW) compensation

Features

—IEEE 802.3 ENDEC with AUI/10BASE-T transceivers

and built-in filters

—IEEE 802.3u 100BASE-TX compatible - directly drives

standard Category 5 UTP, no need for external

100BASE-TX transceiver

—Fully Integrated and fully compliant ANSI X3.263 TPPMD

physical sublayer which includes adaptive equalization

and BLW compensation

—IEEE 802.3u 100BASE-FX compatible - connects directly

to industry standard Electrical/Optical transceivers

—IEEE 802.3u Auto-Negotiation for automatic speed selection

—IEEE 802.3u compatible Media Independent Interface

(MII) with Serial Management Interface

—Integrated high performance 100 Mb/s clock recovery

circuitry requiring no external filters

—Full Duplex support for 10 and 100 Mb/s data rates

—MII Serial 10 Mb/s mode

—Fully configurable node/switch and 100Mb/s repeater

modes

—Programmable loopback modes for flexible systemdiagnostics

—Flexible LED support

—Single register access to complete PHY status

—MDIO interrupt support

—Individualized scrambler seed for 100BASE-TX applications

using multiple PHYs

—Low power consumption for multi-port applications

—Small footprint 80-pin PQFP package