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AX88872P Datasheet

  • AX88872P

  • 10/100BASE Dual Speed “Swipeater” Controller

  • 36頁(yè)

  • ASIX

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AX88872P
10/100BASE Dual Speed 鈥淪wipeater鈥?Controller
10/100BASE Dual Speed 8-Port Repeater with 4-Port Switch
Document No.: AX872-13 / V1.3 / Aug. 11 鈥?9
Features
Support 8 10/100Mbps RMII I/F repeater ports and
2 10/100Mbps RMII/MII switch ports
鈥?/div>
IEEE 802.3u repeater compatible
鈥?/div>
Support virtual switch mode and Master/Slave
mode for the cascade application
鈥?/div>
Build in 4-ports 10/100Mbps Switch engine with
following features
眉
Low cost SSRAM interface to reduce system cost
眉
One or two 64K*32bit SSRAM to buffer packets
眉
4/8 K MAC Address Entry Table is supported
眉
Auto learning and filtering
眉
Aging the MAC Address table is supported
optionally
眉
Three forwarding modes are supported : Store-
and-Forward, Fragment-Free and Auto-Forward
眉
Flow-control is supported optionally.
眉
802.3x flow control is supported in full duplex
mode
眉
Back-pressure base flow control is supported in
half duplex mode
眉
Ext. Buffer Memory auto testing
鈥?/div>
眉
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 鈥淥N-OFF-ON-OFF-Normal鈥?operation
procedure during/after power on reset
50MHz Operation, 3.3volt and 208-pin PQFP
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Product description
The AX88872 10/100Mbps Dual Speed 鈥淪wipeater鈥?Controller is
鈥渁 dual speed repeater with build in 4-ports
switch function鈥?/div>
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 鈥?Repeater for 100Mb/s base-band networks鈥?It is fully compatible with
IEEE 802.3u standard. Please refer Ax873-12.doc to get more information about AX88873.
System Block Diagram
10Mbps and 100Mbps Vertical cascade up to 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 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.
ASIX ELECTRONICS CORPORATION
First Released Date : APR/09/1999
http://www.asix.com.tw
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

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