SMSC LAN931x Family - Ethernet Switches

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LAN931x Family - Ethernet Switches
LAN931x

Full-featured Switching Functions Geared Toward Cost-competitive Embedded Applications

The LAN931x family of embedded Ethernet switches supports the ever-increasing growth of networked devices in home consumer electronics. These devices supply system designers with 2/3-port switching technology to solve network connectivity requirements using both 16/32-bit non-PCI and MII interfaces in a 128-pin VTQFP package. The LAN931x family incorporates IEEE 1588 Precision Time Protocol which provides support for time-critical industrial applications.

Highlights
•	High-performance, full-featured 2/3-port switches with VLAN, QoS packet prioritization, Rate Limiting, IGMP Snooping and management functions
•	Serial management via SPI/I²C or SMI
•	Easily interfaces to most 16/32-bit embedded CPUs (LAN9311/9312)
•	Unique virtual PHY feature simplifies software development by mimicking multiple switch ports as a single port MAC/PHY

Features	Benefits
Non-PCI interface (LAN9311/12)	Single-chip solution for two Ethernet ports where SoCs do not have integrated MAC functionality
MII interface (LAN9313)	Industry-standard, low-pin count interface
VLAN (16/4096 groups)	Increased security options and network performance by filtering packets if ports are not members of VLAN groups
QoS Packet Prioritization	Ensures higher priority packets delivered first, minimizing packet delay critical to IP multimedia streaming applications
IGMP Snooping	Effectively reduce multicast traffic from streaming and other bandwidth-intensive IP applications
IEEE 1588 Precision Time Protocol	Micro to sub-microsecond accuracy to synchronize network time for time-critical/real-time applications
Spanning Tree	Disables redundant network paths eliminating broadcast storms
Industrial temperature range -40˚ to 85˚C options available (LAN9311i/9313i)	Designed to perform in rugged industrial environments

Consumer Application Example: IP Set-top Box (STB)

Trends	Benefits
Adding 2-port switches into the IP STB	Efficient cabling QoS functions enhance quality of IP streaming applicationsHome

Industrial Applications
•	Ease of cabling/daisy chain topology instead of connecting every device to a router
•	Traffic control and trouble reporting
•	Typical applications:
	−	Industrial automation and control
	−	Programmable Logic Controller (PLC)
	−	Test and measurement equipment
	−	Surveillance IP camera

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