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Introduction

MX98726EC ( Generic MAC , or GMAC ) is a cost effective solution as a generic single chip 10/100 Fast Ethernet controller. It is designed to directly interface 80188, 80186 ( host ) without glue logic. Two types of memory sharing schemes are supported, i.e. interleaved and shared mode to support a variety of applications. Single chip solution will help reduce system cost not only on the components but also the board size. Full NWAY function with 10/100 tranceiver will ease the field installation, simply plug the chip in and it will connect itself with the best protocol available.

特性 Features

• Direct interface to 80188/186 up to 40Mhz.

• Integrated 10/100 TP tranceiver on chip to reduce overall cost

• Optional MII interface for external tranceiver.

• Fully comply to IEEE 802.3u spec.

• Best fit in network printer and hub/switch management application

• A local DMA channel between on-chip FIFOs and packet memory

• Shared memory architecture allow host and MX98726EC to use only one single SRAM

• Host DMA can share packet memory with local DMA with simple hand shake protocol for x188/186 type of processor

• Supports proprietary local DMA channel to share packet memory

• Support bus size configuration:

- CPU : 8 bits, SRAM: 8 bits

- CPU : 16 bits, SRAM: 8/16 bits

• Flexible packet buffer partition and addressing space for 32k, 64k up to 512K bytes

• NWAY autonegotiation function to automatically set up network speed and protocol

• 3 loop back modes for system level diagnostics

• Rich on-chip register set to support a wide variety of network management functions

• Support 64 bits hash table for multicast addressing

• Support software EEPROM interface for easy upgrade of EEPROM content

• Support 1K bits and 4K bits EEPROM interface

• 5V CMOS in 128 PQFP package for minimum board size application