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CS8900-CQ

Highly-Integrated ISA Ethernet Controller

Cirrus Logic 

CS8900

EEPROM 20 MHz

XTAL

(1.5 sq. in.)

I

S

CS8900

A

RJ-45 10BASE-T

Figure 1.1. Complete Ethernet Motherboard Solution

node. Its small-footprint package and high level

of integration allow System Engineers to design

a complete Ethernet circuit that occupies as little

as 1.5 square inches of PCB area (Figure 1.1).

In addition, the CS8900’s power-saving features

and CMOS design make it a perfect fit for

power-sensitive portable and desktop PCs.

Motherboard design options include:

• An EEPROM can be used to store node-spe-

cific information, such as the Ethernet

Individual Address and node configuration.

• The 20 MHz crystal oscillator may be re-

placed by a 20 MHz clock signal.

Ethernet Adapter Cards

The CS8900’s highly efficient PacketPage archi-

tecture, with StreamTransferTM and Auto-Switch

DMA options, make it an excellent choice for

high-performance, low-cost ISA adapter cards

(Figure 1.2). The CS8900’s wide range of con-

figuration options and performance features

allow engineers to design Ethernet solutions that

meets their particular system requirements.

Adapter card design options include:

• A Boot PROM can be added to support disk-

less applications.

• The 10BASE-T transmitter and receiver im-

pedance can be adjusted to support 100, 120,

or 150 Ω twisted pair cables.

• An external Latchable-Address-bus decode

circuit can be added to operate the CS8900

in Upper-Memory space.

EEPROM 20 MHz

XTAL

LED

RJ-45

10BASE-T

’245

Boot PROM

LA

Decode

Attachment

Unit

Interface

(AUI)

Figure 1.2. Full-Featured ISA Adapter Solution

DS150PP2

5

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