CS8900A datasheet(9/128 Pages) CIRRUS

9 / 128 page

DS271PP3

CS8900A

Crystal LAN™ ISA Ethernet Controller

CIRRUS LOGIC PRODUCT DATA SHEET

tive portable and desktop PCs. Motherboard design

options include:

•

An EEPROM can be used to store node-specif-

ic information, such as the Ethernet Individual

Address and node configuration.

•

The 20 MHz crystal oscillator may be replaced

by a 20 MHz clock signal.

1.2.2 Ethernet Adapter Cards

The CS8900A’s highly efficient PacketPage archi-

tecture, with StreamTransfer™ and Auto-Switch

DMA options, make it an excellent choice for high-

performance,

low-cost

ISA

adapter

cards

(Figure 2). The CS8900A’s wide range of configu-

ration options and performance features allow en-

gineers to design Ethernet solutions that meet their

particular system requirements. Adapter card de-

sign options include:

•

A Boot PROM can be added to support diskless

applications.

•

The 10BASE-T transmitter and receiver im-

pedance can be adjusted to support 100, 120, or

150 Ohm twisted pair cables.

•

An external Latchable-Address-bus decode cir-

cuit can be added to operate the CS8900A in

Upper-Memory space.

•

On-chip LED ports can be used for either op-

tional LEDs, or as programmable outputs.

RJ-45

10BASE-T

CS8900A

EEPROM 20 MHz

XTAL

(2.0 sq. in.)

Figure 1. Complete Ethernet Motherboard Solution

CS8900A

EEPROM

Boot PROM

’245

20 MHz

XTAL

RJ-45

LED

Attachment

Unit

Interface

(AUI)

Figure 2. Full-Featured ISA Adapter Solution

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