Features
• Proven Integrated 3-Port 10/100 Ethernet Switch:
- 3rd Generation Switch with Three MACs
and Two PHYs, Fully Compliant with
IEEE 802.3u Standard
- Non-Blocking Switch Fabric Assures Fast
Packet Delivery by Utilizing a 1K MAC
Address Look-up Table and a
Store-and-Forward Architecture
- Full-Duplex IEEE 802.3x Flow Control
(PAUSE) with Force Mode Option
- Half-Duplex Backpressure Flow Control
- HP Auto MDI-X for Reliable Detection of, and
Correction for, Straight-Through and Crossover
Cables with Disable and Enable Option
- Microchip LINKMD® TDR-Based Cable
Diagnostics Permit Identification of Faulty
Copper Cabling
- 100BASE-FX Support on Port 1
- MII Interface Supports Both MAC Mode and
PHY Mode
- RMII Interface Support with External
50 MHz System Clock
- 7-Wire Serial Network Interface (SNI)
Support for Legacy MAC
- Comprehensive LED Indicator Support for Link,
Activity, Full/Half-Duplex and 10/100 Speed
• Comprehensive Configuration Register Access:
- Serial Management Interface (SMI) to All
Internal Registers
- MII Management (MIIM) Interface to PHY Registers
- SPI and I2C Interface to All Internal Registers
- I/O Pins Strapping and EEPROM to Program
Selective Registers in Unmanaged Switch Mode
- Control Registers Configurable On-the-Fly
(Port Priority, 802.1p/d/q, AN…)
• QoS/CoS Packet Prioritization Support:
- Per Port, 802.1p and DiffServ-Based
- Remapping of 802.1p Priority Field per Port Basis
- Four Priority Levels
• Advanced Switch Features:
- IEEE 802.1Q VLAN Support for Up to
16 Groups (Full Range of VLAN IDs)
- VLAN ID Tag/Untag Options per Port Basis
- IEEE 802.1p/q Tag Insertion or Removal on a
per Port Basis (Egress)
- Programmable Rate Limiting at the Ingress
and Egress on a per Port Basis
- Broadcast Storm Protection with Percent
Control (Global and per Port Basis)
• Advanced Switch Features (Continued):
- IEEE 802.1d Spanning Tree Protocol Support
- Special Tagging Mode to Inform the Processor
which Ingress Port Receives the Packet
- IGMP Snooping (IPv4) and MLD Snooping
(IPv6) Support for Multicast Packet Filtering
- MAC Filtering Function to Forward Unknown
Unicast Packets to Specified Port
- Double-Tagging Support
- Supports IEEE 802.1w, 802.1t Spanning Tree
• Low-Latency Support:
- Repeater Mode
• Switch Monitoring Features:
- Port Mirroring/Monitoring/Sniffing: Ingress
and/or Egress Traffic to Any Port or MII
- MIB Counters for Fully Compliant Statistics
Gathering, 34 MIB Counters per Port
- Loopback Modes for Remote Diagnostic of Failure
• Low-Power Dissipation:
- Full Chip Hardware Power-Down
(Register Configuration is Not Saved)
- Per Port-Based Software Power Save on PHY (Idle
Link Detection, Register Configuration Preserved)
- Single 3.3V Power Supply
• Industrial Temperature Range: –40°C to +85°C
• Available in a 128-Pin PQFP and 100-Ball LFBGA:
- Lead-Free Package

Applications
• Typical:
- Media Converter
- FTTx Customer Premises Equipment
- VoIP Phone
- SOHO Residential Gateway
- Broadband Gateway/Firewall/VPN
- Integrated DSL/Cable Modem
- Wireless LAN Access Point + Gateway
- Set-Top/Game Box
- Stand-Alone 10/100 Switch
• Upgradeable(1):
- Unmanaged Switch with Future Option to
Migrate to a Managed Solution
- Single PHY Alternative with Future
Expansion Option for Two Ports
• Industrial:
- Applications Requiring Port Redundancy and
Port Monitoring
- Sensor Devices in Redundant Ring Topology