ASIX ELECTRONICS CORPORATION

Doc. No. AX873-11.DOC Date : APR/26/1999

2F, NO.13, Industry East Rd. II, Science-based Industrial Park, Hsin-Chu City, Taiwan, R.O.C.

TEL: 886-3-579-9500

FAX: 886-3-579-9558

http://www.asix.com.tw

AX88873P

10/100BASE Dual Speed Repeater Controller

10/100BASE Dual Speed 8-Port Repeater

Ver. 1.1

Features

•

IEEE 802.3u repeater compatible

•

Supports 8 10/100Mbps RMII I/F repeater ports

•

Accompany with AX88872 to build a low cost dual

speed repeater solution

•

Up-to 4 repeaters can be cascaded for vertical

expansion

•

Up-to 3 chips can be cascaded locally for horizontal

expansion

•

All ports can be separately isolated or partitioned in

response to fault condition

•

Separate jabber and partition state machines for

each port

•

Per-port LED display for Jabber, Partition, Activity

and

global

collision,

utilization

(%)

for

10/100Mbps presentation

•

Power on LED diagnosis. All the LED display will

follow the “ON-OFF-ON-OFF-Normal” operation

procedure during/after power on reset

•

50MHz Operation, 3.3volt and 128-pin PQFP

Product description

The AX88873 10/100Mbps Dual Speed repeater Controller is a counterpart of AX88872 without built in 4-ports

switch. It is design for low cost dual speed dumb HUB application.

The AX88873 directly supports up-to eight 10/100Mbps automatic links RMII interfaces. Maximum up-to 96

repeater ports can be constructed by stacking 1 AX88872 and 2 AX88873 chips horizontally and then cascading 4

horizontal boards vertically.

With using 128-pin low cost package, accompany with AX88872 to build up low cost dual speed repeater application.

Not only perform the repeater function but gain additional 2 switch ports. The 2 dual speed switch ports are connected

to external MII or RMII interfaces PHY for various applications. For example, one port is use for down link and the

other is used for up link to extend the network topology. The other case is one port for up link and the other port for

server.

The AX88873 is designed base on IEEE 802.3u clause 27 “ Repeater for 100Mb/s base-band networks” It is fully

compatible with IEEE 802.3u standard. Please refer Ax872-11.doc to get more information about AX88872.

System Block Diagram

Always contact ASIX for possible updates before starting a design.

This data sheet contains new products information. ASIX ELECTRONICS reserves the rights to modify product specification without notice. No liability

is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product.

AX88873 #1

Repeater Controller

Buffer

100Mbps horizontal cascade

10Mbps and 100Mbps Vertical cascade upto 4 stacks

AX88873 #0

Repeater Controller

AX88872 #0

Swipeater Controller

10Mbps horizontal cascade

2 Quad RMII PHY

2 Quad RMII PHY

2 Quad RMII PHY

PHY for Up-link

PHY for Down-link or Server