ASIX ELECTRONICS CORPORATION

First Released Date : APR/09/1999

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

AX88872P

10/100BASE Dual Speed “Swipeater” Controller

10/100BASE Dual Speed 8-Port Repeater with 4-Port Switch

Document No.: AX872-13 / V1.3 / Aug. 11 ’99

Features

•

Support 8 10/100Mbps RMII I/F repeater ports and

2 10/100Mbps RMII/MII switch ports

•

IEEE 802.3u repeater compatible

•

Support virtual switch mode and Master/Slave

mode for the cascade application

•

Build in 4-ports 10/100Mbps Switch engine with

following features

ü Low cost SSRAM interface to reduce system cost

ü One or two 64K*32bit SSRAM to buffer packets

ü 4/8 K MAC Address Entry Table is supported

ü Auto learning and filtering

ü Aging the MAC Address table is supported

optionally

ü Three forwarding modes are supported : Store-

and-Forward, Fragment-Free and Auto-Forward

ü Flow-control is supported optionally.

ü 802.3x flow control is supported in full duplex

mode

ü Back-pressure base flow control is supported in

half duplex mode

ü Ext. Buffer Memory auto testing

ü Routing and Learning at wire speed (148800

packets/sec at 100Mbps)

•

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. RAM test fail and collision, buffer

utilization (%) and global traffic 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 208-pin PQFP

Product description

The AX88872 10/100Mbps Dual Speed “Swipeater” Controller is “a dual speed repeater with build in 4-ports

switch function” It is design for low cost dumb HUB application. The AX88872 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. About the build in

4-port switch: The switch port3 is fixed to 10Mbps speed and connects to 10Mbps repeater segment, The switch port2

is fixed to 100Mbps and connects to 100M repeater segment. The switch ports 0 and 1 are connected to external MII

or RMII interfaces for various applications. For example, one port is used 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 AX88872

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 Ax873-12.doc to get more information about AX88873.

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 the 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 up to 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