Three Port 10/100 Managed Ethernet Switch with MII

SMSC LAN9313/LAN9313i

3

Revision 1.9 (03-13-12)

PRODUCT PREVIEW

General Description

The LAN9313/LAN9313i is a full featured, 3 port 10/100 managed Ethernet switch designed for

embedded applications where performance, flexibility, ease of integration and system cost control are

required. The LAN9313/LAN9313i combines all the functions of a 10/100 switch system, including the

switch fabric, packet buffers, buffer manager, media access controllers (MACs), PHY transceivers, and

serial management. The LAN9313/LAN9313i complies with the IEEE 802.3 (full/half-duplex 10BASE-

T and 100BASE-TX) Ethernet protocol specification and 802.1D/802.1Q network management protocol

specifications, enabling compatibility with industry standard Ethernet and Fast Ethernet applications.

At the core of the LAN9313/LAN9313i is the high performance, high efficiency 3 port Ethernet switch

fabric. The switch fabric contains a 3 port VLAN layer 2 switch engine that supports untagged, VLAN

tagged, and priority tagged frames. The switch fabric provides an extensive feature set which includes

spanning tree protocol support, multicast packet filtering and Quality of Service (QoS) packet

prioritization by VLAN tag, destination address, port default value or DIFFSERV/TOS, allowing for a

range of prioritization implementations. 32K of buffer RAM allows for the storage of multiple packets

while forwarding operations are completed, and a 1K entry forwarding table provides ample room for

MAC address forwarding tables. Each port is allocated a cluster of 4 dynamic QoS queues which allow

each queue size to grow and shrink with traffic, effectively utilizing all available memory. This memory

is managed dynamically via the buffer manager block within the switch fabric. All aspects of the switch

fabric are managed via the switch fabric configuration and status registers, which are indirectly

accessible via the system control and status registers.

The LAN9313/LAN9313i provides 3 switched ports. Each port is fully compliant with the IEEE 802.3

standard and all internal MACs and PHYs support full/half duplex 10BASE-T and 100BASE-TX

operation. The LAN9313/LAN9313i provides 2 on-chip PHYs, 1 Virtual PHY and 3 MACs. The Virtual

PHY and the third MAC are used to connect the LAN9313/LAN9313i switch fabric to an external MAC

or PHY. All ports support automatic or manual full duplex flow control or half duplex backpressure

(forced collision) flow control. 2K jumbo packet (2048 byte) support allows for oversized packet

transfers, effectively increasing throughput while deceasing CPU load. All MAC and PHY related

settings are fully configurable via their respective registers within the LAN9313/LAN9313i.

inclusion of these interfaces allows for greater flexibility in the incorporation of the LAN9313/LAN9313i

into various designs. It is this flexibility which allows the LAN9313/LAN9313i to operate in 2 different

modes and under various management conditions. In MAC mode, the LAN9313/LAN9313i can be

connected to an external PHY via the MII interface. In PHY mode, the LAN9313/LAN9313i can be

connected to an external MAC via the MII interface. In both MAC and PHY modes, the

in management makes the LAN9313/LAN9313i a candidate for virtually all switch applications.

optional EEPROM. This allows for the storage and retrieval of static data. The internal EEPROM

Loader can be optionally configured to automatically load stored configuration settings from the

EEPROM into the LAN9313/LAN9313i at reset, allowing the LAN9313/LAN9313i to operate

unmanaged.

In addition to the primary functionality described above, the LAN9313/LAN9313i provides additional

features designed for extended functionality. These include a configurable 16-bit General Purpose

Timer (GPT), a 32-bit 25MHz free running counter, a 12-bit configurable GPIO/LED interface, and IEEE

1588 time stamping on all ports and select GPIOs. The IEEE time stamp unit provides a 64-bit tunable

clock for accurate PTP timing and a timer comparator to allow time based interrupt generation.

The LAN9313/LAN9313i’s performance, features and small size make it an ideal solution for many

applications in the consumer electronics and industrial automation markets. Targeted applications

include: set top boxes (cable, satellite and IP), digital televisions, digital video recorders, voice over IP

and video phone systems, home gateways, and test and measurement equipment. System-level and

block-level diagrams of the LAN9313/LAN9313i can be seen in on the following pages.