INTRODUCTION

82595FX Overview

The 82595FX is a highly integrated, high performance LAN controller which provides a cost effective LAN solution for ISA compatible Personal Computer (PC) motherboards (both desktop and portable), and add-on ISA adapter boards. The 82595FX integrates all of the major functions of a buffered LAN solution into one chip with the exception of the local buffer memory, which is implemented by adding one SRAM component to the LAN solution. The 82595FX’s Concurrent Processing feature significantly enhances throughput performance. Both system bus and serial link activities occur concurrently, allowing the 82595FX to maximize network bandwidth by minimizing delays associated with transmit or receiving frames. The 82595FX’s bus interface is a glueless attachment to an ISA bus. Its serial interface provides a Twisted Pair Ethernet (TPE) and an Attachment Unit Interface (AUI) connection. By integrating the majority of the LAN solution functions into one cost effective component, production cost saving can be achieved as well as significantly decreasing the design time for a solution. This level of integration also allows an 82595FX solution to be ported between different applications (PC motherboards, and adapters, while maintaining a compatible hardware and software base.

■ Optimal Integration for Lowest Cost Solution

— Glueless 8-Bit/16-Bit ISA Bus Interface

— Provides Fully 802.3 Compliant AUI and TPE Serial Interface

— Local SRAM Support up to 64 Kbytes

— Integrated ISA Bus Data Transceivers

— FLASH/EPROM Boot Support up to 1 Mbyte for Diskless Workstations

— Hardware and Software Portable between Motherboard and Adapter Card Solutions

■ High Performance Networking Functions

— Advanced Concurrent Processing of Receive and Transmit Functions

— 16-Bit/32-Bit IO Accesses to Local SRAM with Zero Added Wait-States

— Ring Buffer Structure for Continuous Frame Reception and Transmit Chaining

— Automatic Retransmission on Collision

— Automatically Corrects TPE Polarity Switching Problems

— Auto Negotiation/Manual Full Duplex Support

■ Low Power CHMOS IV Technology

■ Ease of Use

— Auto-Negotiation of Full Duplex Functionality

— Fully Compatible with ISA Plug and Play Specification

— EEPROM Interface to Support Jumperless Designs

— Software Structures Optimized to Reduce Processing Steps

— Automatically Maps into Unused PC IO Locations to Help Eliminate LAN Setup Problems

— All Software Structures Contained in One 16-Byte IO Space

— JTAG Port for Reduced Board Testing Times

— Automatic or Manual Switching between TPE and AUI Ports

— Supports Eight IRQs

■ Power Management

— Advanced Power Management Support by Power Down and Sleep Mode

— Both SL Compatible SMOUT Input and Non-SL Software Parameter for Power Down Mode

■ 160-Lead QFP Package Provides Smallest Available Form Factor

■ 100 Backwards Software Compatible to 82595TX