CS8904 datasheet(3/34 Pages) CIRRUS

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DS191PP2

CS8904

Crystal LAN™ Quad Ethernet Transceiver

CIRRUS LOGIC ADVANCED PRODUCT DATABOOK

1.0 INTRODUCTION

1.1 General Description

The CS8904 is a true single-chip quad Ethernet

interface solution, incorporating all analog and

digital circuitry needed for a complete Ethernet

front end circuit. It includes high-performance on-

chip filtering, eliminating the need for external

filters. In addition, the CS8904 supports the latest

IEEE Ethernet features including full duplex and

Auto-Negotiation.

The

CS8904

incorporates

four

independent

Manchester encoder/decoders (ENDEC), clock

recovery circuits, 10BASE-T transceivers, and link

status LED circuits. The 10BASE-T transceivers

include drivers, receivers, and high-performance

on-chip analog filters, allowing direct connections

to low-cost isolation transformers. The CS8904’s

superior EMI characteristics are a result of the

high-quality receive and transmit filters which

eliminate the need for external filter packs and help

to make FCC Part 15, Class B compliance easier to

achieve. Each of the four transceivers support half

and full duplex operation and include IEEE-

compliant Auto-Negotiation capability.

RJ-45

10BASE-T

CS8904

20 MHz

XTAL

LINKLED

RJ-45

10BASE-T

LINKLED

RJ-45

10BASE-T

LINKLED

RJ-45

10BASE-T

LINKLED

SYSTEM

ASIC

Figure 1. Ethernet Switching Hub Application of CS8904

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