AX88873P
10/100BASE Dual Speed Repeater Controller
10/100BASE Dual Speed 8-Port Repeater
Ver. 1.1
Features
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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
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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
10Mbps and 100Mbps Vertical cascade upto 4 stacks
Buffer
10Mbps horizontal cascade
100Mbps horizontal cascade
AX88873 #1
Repeater Controller
AX88873 #0
Repeater Controller
AX88872 #0
Swipeater Controller
PHY for Up-link
2 Quad RMII PHY
2 Quad RMII PHY
2 Quad RMII PHY
PHY for Down-link or Server
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.
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
ASIX [ ASIX ELECTRONICS CORPORATION ]
