Cirrus-logic CS8900A Uživatelský manuál stáhnout pdf (Strana 9)

DS271F5 9

CS8900A

Crystal LAN™ Ethernet Controller

CIRRUS LOGIC PRODUCT DATASHEET

high level of integration allow System Engi-

neers to design a complete Ethernet circuit

that occupies as little as 1.5 square inches of

PCB area (Figure 1). In addition, the

CS8900A’s power-saving features and CMOS

design make it a perfect fit for power-sensitive

portable and desktop PCs. Motherboard de-

sign options include:

• An EEPROM can be used to store node-

specific 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.

1.2.2 Ethernet Adapter Cards

The CS8900A’s highly efficient PacketPage

architecture, 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 configuration options and perfor-

mance features allow engineers to design

Ethernet solutions that meet their particular

system requirements. Adapter card design op-

tions include:

• A Boot PROM can be added to support

diskless applications.

• The 10BASE-T transmitter and receiver

impedance can be adjusted to support 100,

120, or 150 Ohm twisted pair cables.

• An external Latchable-Address-bus de-

code circuit can be added to operate the

CS8900A in Upper-Memory space.

RJ-45

10BASE-T

CS8900A

I

S

A

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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