General Description :

The IP1725 is a cost effective and fully integrated single chip. It integrates a 25-port switch controller, an 3X octal PHY transceiver and SSRAM. Each of PHY transceiver complies with 802.3u specification and HP-license Auto MDI/MDIX.                              

It supports full smart switch functions, including IGMP snooping, 4 priority queues, TOS, TCP/UDP port number priority, 802.1Q VLAN, port security, protocol filter/forwarding and bandwidth control.

Feature :

• S25 Ports 10/100Mb Ethernet Layer 2 Smart Switch
  - Built-in 24 PHYs
  - One MII interface

• Store & Forward, Share Memory Non_blocking Architecture
  - Built-in 2.5Mb SRAM (1.75Mb for packet buffer)

  - Max. length 1664B

• Wire-speed Operation On Every Port

• Head Of Line Blocking Prevention

• Flow Control Support

  - 802.3x compliant flow control in full duplex

  - Collision/Carrier_snese based backpressure in half duplex

• Internal 8K MAC Address Entities

  - CRC/direct hashing algorithm

  - Aging timer programmable (55s~251.6hr) < 4 %

  - Wire speed address learning and resolution

  - CPU accessible for security and static MAC

  - Learning enable/disable

• Sniffer Function Support (in/out/in+out)

• IGMP Snooping Support

  - Version 1 , 2

  - Snooping by Switch ASIC or external CPU

• Two Trunk Group Support

  - Two trunk groups, each trunk has 4 ports (max)

  - The ports belong to trunk group are configurable

  - Load balance based on (Port ID, DA , SA, DA/SA)

  - Link fault recovery

•  VLAN (32 VLAN groups)

  - Port based

  - Tagged based

  - Tag remove/add/modify support

  - Special TAG support

  - Protected VLAN

  - Q-in-Q (double tag) support

• Class Of Service (CoS) Support

  - Port based

  - 802.1Q priority based tagged based

  - IP TOS based (IPv4/IPv6)

  - TCP/UDP port number based

  - Destination MAC address based

  - IP address based

  - 4 levels per port

  - WRR/FIFS/SP/SP+WRR

  - ACL based

• Broadcast Storm Control

  - Broadcast rate control per port selectable

  - With option to drop all ARP to CPU

  - Also has ARP and ICMP storm control

• Multi-cast/unknown DA frames can be counted

• Port Security

  - MAC based

  - IP(DIP/SIP) based (IPv4 32 bit only

  - TCP/UDP port based

  - Port based

• Bandwidth Control

  - 32K bpsxN 256 levels

  - 512K bpsxN 256 levels

  - With flow control/Without flow control

  - WAN port control support

• Support SMI Interface Auto-polling

  - Speed, Duplex, Flow control, Link

  - CPU accessible (interrupt support)

  - CPU R/W PHY register

• Out Queue Aging Function

  - From 100 ms to 6.3 sec selectable

• Spanning Tree Protocol Port State Support

  - Discard/Block/Learning/Forwarding four states support

  - Forwarding STP frame to CPU port

  - RSTP support

• Support 16 ACL Entities Based On

  - Ingress port or VLAN

  - Destination/Source IP (specific or range)

  - TCP/UDP Destination/Source port number (specific, > 1023, <=1023)

  - Forwarding STP frame to CPU port

  - Action : forward, to CPU, drop, priority, Q-in-Q tag

• Configuration

  - Pin initial setting

  - 2-wire serial interface for configuration EEPROM

  - 2-wire serial interface for low cost smart system application

• Per Port 2 Counter (32 bit x 2) Selectable

  - RX/TX packet count

  - CRC error packet count

  - Drop packet count

  - Collision count

• LED

  - Direct mode

  - 2-wire serial mode

• Support Auto Test Function For Mass-production

  - Auto generate test frames

  - Shown the result on LED output

• Interrupt Pin For PHY Mode/Link/SMI R/W

  - Complete notification

• Build-in SRAM Self Test (BIST)

• Build-in Oscillator Circuit, Only One 25 MHz Crystal Needed

• IO Voltage Selectable (3 groups)

• 90 nm Process, 208 Pin EDHS-QFP