LAN9312 Datasheet PDF - SMSC -> Microchip

Highlights
High performance and full featured 2 port switch with VLAN, QoS packet prioritization, Rate Limiting, IGMP Snooping and management functions
Easily interfaces to most 32-bit embedded CPU’s
Unique Virtual PHY feature simplifies software development by mimicking the multiple switch ports as a single port MAC/PHY
Integrated IEEE 1588 Hardware Time Stamp Unit

Target Applications
Cable, satellite, and IP set-top boxes
Digital televisions
Digital video recorders
VoIP/Video phone systems
Home gateways
Test/Measurement equipment
Industrial automation systems

Key Benefits
Ethernet Switch Fabric
— 32K buffer RAM
— 1K entry forwarding table
— Port based IEEE 802.1Q VLAN support (16 groups)
         – Programmable IEEE 802.1Q tag insertion/removal
— IEEE 802.1d spanning tree protocol support
— QoS/CoS Packet prioritization
– 4 dynamic QoS queues per port
– Input priority determined by VLAN tag, DA lookup, TOS, DIFFSERV or port default value
– Programmable class of service map based on input priority
– Remapping of 802.1Q priority field on per port basis
– Programmable rate limiting at the ingress/egress ports with random early discard, per port / priority
— IGMP v1/v2/v3 snooping for Multicast packet filtering
— IPV6 Multicast Listener Discovery snoop
— Programmable filter by MAC address „ Switch Management
— Port mirroring/monitoring/sniffing: ingress and/or egress traffic on any ports or port pairs
— Fully compliant statistics (MIB) gathering counters
— Control registers configurable on-the-fly