CS8904 datasheet(4/34 Pages) CIRRUS

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DS191PP2

CS8904

Crystal LAN™ Quad Ethernet Transceiver

CIRRUS LOGIC ADVANCED PRODUCT DATABOOK

Each of the CS8904 interface ports support 100,

120, and

150 Ω shielded and unshielded cables, and

automatic receive reverse-polarity detection and

correction.

1.2 System Applications

The CS8904 is designed for use in Ethernet switch,

hub, and router systems and in ATM switches with

Ethernet support. Offering the latest features of the

IEEE 802.3 specification (ISO/IEC 8802-3:1996),

the CS8904 can be easily interfaced to custom

digital system ASICs. Inputs to the CS8904 from

the digital system ASIC are: transmit data, transmit

enable,

duplex

selection,

auto-negotiation

selection, and loopback selection (loopback from

digital system ASIC through CS8904 to digital

system ASIC), and mode selection. Mode selection

allows the CS8904 to operate with a variety of

compatible Ethernet controllers.

Outputs of the CS8904 to the digital system ASIC

are: transmit clock, receive clock, receive data, and

five status lines: collision detect, carrier detect,

jabber indication, duplex (half / full), and auto-

negotiation (active / inactive).

The Link Status LED indicates that there is an

operational link with the remote network device.

1.3 Key Features and Benefits

1.3.1 Low Cost, Low Noise, More Features

•

High-performance on-chip 10BASE-T filters

allow designers to use simple isolation trans-

formers instead of more costly filter/transform-

er packages.

•

The CS8904 is designed to be used on a 4-layer

circuit board instead of a more expensive multi-

layer board, saving board manufacturing costs.

•

The CS8904 has been designed for very low

noise emission. As a result FCC testing and

qualification time is reduced considerably.

•

Half and full duplex operation make the

CS8904 ideal for use in 10BASE-T Ethernet

switch designs and in ATM switch systems that

require 10BASE-T Ethernet ports.

•

Auto-Negotiation capability that is fully com-

pliant with the latest IEEE Ethernet specifica-

tion (ISO/IEC 8802-3:1995(u)) provides the

newest Ethernet features to system designers.

CS8904 Datasheet(PDF) 4 Page - Cirrus Logic

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