描述 Description

The LAN9312 is a full featured, 2 port 10/100 managed Ethernet switch designed for embedded applications where performance, flexibility, ease of integration and system cost control are required. The LAN9312 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 host bus interface. The LAN9312 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 LAN9312 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 memory mapped system control and status registers.

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特性 Features

Highlights
? High performance and full featured 2 port switch with VLAN, QoS packet prioritization, Rate Limiting, IGMP?monitoring 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?monitoring for Multicast packet filtering
? 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
? Ports
? 2 internal 10/100 PHYs with HP Auto-MDIX support
? Fully compliant with IEEE 802.3 standards
? 10BASE-T and 100BASE-TX support
? Full and half duplex support
? Full duplex flow control
? Backpressure (forced collision) half duplex flow control
? Automatic flow control based on programmable levels
? Automatic 32-bit CRC generation and checking
? Automatic payload padding
? 2K Jumbo packet support
? Programmable interframe gap, flow control pause value
? Full transmit/receive statistics
? Auto-negotiation
? Automatic MDI/MDI-X
? Loop-back mode
? High-performance host bus interface
? Provides in-band network communication path
? Access to management registers
? Simple, SRAM-like interface
? 32-bit data bus
? Big, little, and mixed endian support
? Large TX and RX FIFO's for high latency applications
? Programmable water marks and threshold levels
? Host interrupt support
? IEEE 1588 Hardware Time Stamp Unit
? Global 64-bit tunable clock
? Master or slave mode per port
? Time stamp on TX or RX of Sync and Delay_req packets per port, Timestamp on GPIO
? 64-bit timer comparator event generation (GPIO or IRQ)
? Comprehensive Power Management Features
? Wake on LAN
? Wake on link status change (energy detect)
? Magic packet wakeup
? Wakeup indicator event signal
? Other Features
? General Purpose Timer
? Serial EEPROM interface (I2C master or Microwire? master) for non-managed configuration
? Programmable GPIOs/LEDs
? Single 3.3V power supply
? Available in Commercial Temp. Range

應用 Application

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

簡介

LAN9312屬于集成電路（IC）的控制器。由制造生產(chǎn)的LAN9312控制器該系列產(chǎn)品主要用于在采用不同通信協(xié)議和/或信令方法的端點之間提供信息連接。示例包括將 I2C 總線連接到 UART，將 USB 連接到 I2C、SPI、以太網(wǎng)或 UART、以太網(wǎng) MAC 和 PHY 等的器件。此外，還包括用于通過為點對點通信設計的接口建立多路連接的器件，例如 USB 集線器控制器。