描述 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.

特性 Features

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