CS8900-CQ 查看數據表（PDF） - Cirrus Logic

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CS8900-CQ

Highly-Integrated ISA Ethernet Controller

Cirrus Logic 

CS8900

1.0 INTRODUCTION

1.1 General Description

The CS8900 is a true single-chip, full-duplex,

Ethernet solution, incorporating all of the analog

and digital circuitry needed for a complete Eth-

ernet circuit. Major functional blocks include: a

direct ISA-bus interface; an 802.3 MAC engine;

integrated buffer memory; a serial EEPROM in-

terface; and a complete analog front end with

both 10BASE-T and AUI.

Direct ISA-Bus Interface

Included in the CS8900 is a direct ISA-bus inter-

face with full 24 mA drive capability. Its

configuration options include a choice of four in-

terrupts and three DMA channels (one of each

selected during initialization). In Memory

Mode, it supports Standard or Ready Bus cycles

without introducing additional wait states.

Integrated Memory

The CS8900 incorporates a 4-Kbyte page of on-

chip memory, eliminating the cost and board

area associated with external memory chips.

Unlike most other Ethernet controllers, the

CS8900 buffers entire transmit and receive

frames on chip, eliminating the need for com-

plex, inefficient memory management schemes.

In addition, the CS8900 operates in either Mem-

ory space, I/O space, or with external DMA

controllers, providing maximum design flexibil-

ity.

802.3 Ethernet MAC Engine

The CS8900’s Ethernet Media Access Control

(MAC) engine is fully compliant with the IEEE

802.3 Ethernet standard (ISO/IEC 8802-3, 1993),

and supports full-duplex operation. It handles all

aspects of Ethernet frame transmission and re-

ception, including: collision detection, preamble

generation and detection, and CRC generation

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and test. Programmable MAC features include

automatic re-transmission on collision, and auto-

matic padding of transmitted frames.

EEPROM Interface

The CS8900 provides a simple and efficient se-

rial EEPROM interface that allows configuration

information to be stored in an optional

EEPROM, and then loaded automatically at

power-up. This eliminates the need for costly

and cumbersome switches and jumpers.

Complete Analog Front End

The CS8900’s analog front end incorporates a

Manchester encoder/decoder, clock recovery cir-

cuit, 10BASE-T transceiver, and complete

Attachment Unit Interface (AUI). It provides

manual and automatic selection of either

10BASE-T or AUI, and offers three on-chip

LED drivers for link status, bus status, and Eth-

ernet line activity.

The 10BASE-T transceiver includes drivers, re-

ceivers, and analog filters, allowing direct

connection to low-cost isolation transformers. It

supports 100, 120, and 150 Ω shielded and un-

shielded cables, extended cable lengths, and

automatic receive polarity reversal detection and

correction.

The AUI port provides a direct interface to

10BASE-2, 10BASE-5 and 10BASE-FL net-

works, and is capable of driving a full 50-meter

AUI cable.

1.2 System Applications

The CS8900 is designed to work well in either

motherboard or adapter applications.

Motherboard LANs

The CS8900 requires the minimum number of

external components needed for a full Ethernet

DS150PP2

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