ASIX ELECTRONICS CORPORATION

4

CONFIDENTIAL

AX88873P 10/100Mb Repeater Controller PRELIMINARY

1.0 AX88873 Overview

1.1 General Description

The AX88873 is a simple dual speed repeater that provides two expansion buses for 10M and 100M

segments respectively. Accompany with AX88872 (build-in a 4-port switch) can construct high port

count (16 ports or 24 ports) application and gain 2 additional switch ports. Additional two switch

ports are also useful for up-link or connection of server.

The pin count of chip is reduced to 128 when design uses RMII I/F instead of MII. It is not only

simplify the design but also user can choose low cost RMII Quad PHY.

1.2 AX88873 Block Diagram:

10/100

Q-PHY

10/100

Q-PHY

RMII

I/F

RMII /MII

translation

for Repeater

Port 0 -7

Repeater State

Machine of 100Mbps

Led Interface

Cascade

Arbitration Logic

of 100Mbps

Repeater State

Machine of 10Mbps

Cascade

Arbitration Logic

of 10Mbps

Per Port Jabber

Detection

Per Port Partition

Detection

Fig - 1 AX88873 Block Diagram