CS8920 datasheet(6/66 Pages) CIRRUS

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AN84REV1

CS8920 Technical Reference Manual

1.0 Introduction to CS8920

Technical Reference Manual

This Manual provides the information

which will be helpful in designing a board

using the CS8920, programming the

associated EEPROM, and installing and

running the CS8920 device drivers. It is

expected that the user of this Technical

Reference Manual will have a general

knowledge of hardware design, Ethernet,

the ISA bus, and networking software.

Recommended sources of background

information are:

a) ISA System Architecture by Shanley

and Anderson, Mindshare Press, 1992,

ISBN 1-881609-05-7

b) Ethernet, Building a Communication

Infrastructure, by Hegering and Lapple,

Addison-Wesley, 1993, ISBN 0-201-

62405-2

c) Netware Training Guide: Networking

Technologies, by Debra Niedenmiller-

Chaffis, New Riders Publishing, ISBN

1-56205-363-9

As shown in the Figure 1.1, the CS8920

requires a minimum number of external

components. The EEPROM stores

configuration information such as interrupt

number, DMA channel, I-O base address,

memory base address, and IEEE Individual

Address. The EEPROM can be eliminated

on a PC motherboard if that information in

stored in the system CMOS. Note also that

the Boot PROM is only needed for diskless

workstations that boot DOS at system

power up, over the network. Also, the LEDs

are optional.

Figure 1.1 - Hardware Application Summary

Boundary

RAM

ISA

Bus

Logic

Memory

Manager

Media Access

Control

(MAC).

Ethernet

protocol

processing.

EEPROM

Control

Encoder,

Decoder

PLL

10BASE-T

RX Filters &

Receiver

10BASE-T

TX Filters &

Transmitter

AUI

Transmitter

AUI

Collision

AUI

Receiver

Clock

Power

Manage

Scan

Test Logic

LED

Control

EEPROM:

Stores Configuration

Information &

IEEE Address

pins

ISA Bus

Boot PROM:

Used to boot diskless

workstations.

AUI

Transformer

(Attachment

Unit

Interface)

10BASE-T

Transformer

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