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Single-Chip 6-Port 10/100Mbps Ethernet Switch Controller with MII/RMII Interface
General Description

The RTL8306M-GR is a 6-port Fast Ethernet switch controller that integrates memory, six MACs, and five physical layer transceivers for 10Base-T and 100Base-TX operation into a single chip.

The RTL8306M supports a MII/RMII interface for external devices to connect to the 6th MAC. The external device could be a routing engine, HomePNA, HomePlug, or VDSL transceiver depending on the application. In order to accomplish diagnostics in complex network systems, the RTL8306M provides a loopback feature in each port.

The RTL8306M supports several advanced QoS functions with four-level priority queues to improve multimedia or real-time networking applications, including:

  • Multi-priority assignment
  • Differential queue weight
  • Port-based and queue-based rate limitation
  • 16-entry ACL for advanced packet control application

    For multicast applications, the RTL8306M supports IGMPv1/v2/v3 and MLDv1/v2 snooping.

    To meet security and management requirements, the RTL8306M supports IEEE 802.1x Port-based/MAC-based Access Control, MAC Address Limits, Port Isolation, Port Mirroring, and also supports five 32-bit MIB Counters on each port.

    The RTL8306M supports 16 VLAN groups. These can be configured as port-based VLANs and/or 802.1Q tag-based VLANs. The RTL8306M also supports VLAN translation and QinQ.

    The RTL8306M contains a 2K-entry address lookup table. Two 4-way associative hash algorithms avoid hash collisions and maintain forwarding performance. The 2K-entry table provides read/write access from the SMI interface, and each of the entries can be configured as a static entry that does not automatically age out and can only be controlled by the external management processor. For IGMP/MLD snooping application, each of the 2K entries can be configured as a multicast entry that indicates the matched packets will be forwarded to specific multi ports. For IEEE 802.1x application, each of the 2K entries can be configured as an authorized or unauthorized entry.
    Maximum packet length can be 2047 bytes. Two types of independent storm filter are provided to filter packet storms, and an intelligent switch engine prevents Head-of-Line blocking problems. The filtering function is supported for IEEE 802.1D specified reserved multicast addresses (01-80-C2-00-00-02 and 01-80-C2-00-00-04 to 01-80-C2-00-00-0F).

    The RTL8306M provides flexible LED functions for diagnostics, with four combination modes. It also provides one LED to indicate all ports’ link and activity information. An externally managed processor can control the LEDs via SMI.

    The RTL8306M supports Realtek’s Green Ethernet power saving mode, as well as Energy-Efficient Ethernet mode (EEE; defined in IEEE 802.3az) to minimize system power consumption. Green Ethernet Features include:

  • Link-On and Cable Length Power Saving
    The RTL8306M provides link-on and dynamic detection of cable length and dynamic adjustment of power required for the detected cable length. This feature provides high performance with minimum power consumption.
  • Link-Down Power Saving
    The RTL8306M implements link-down power saving on a per-port basis, greatly cutting power consumption when the network cable is disconnected.
    Energy-Efficient Ethernet (EEE) supports Low Power Idle Mode. When Low Power Idle Mode is enabled, systems on both sides of the link can disable portions of the functionality and save power during periods of low link utilization.
    For whole system power saving, the RTL8306M supports the Wake-on-LAN (WOL) function and provides control signals to manage the system power based on the port linkage and the traffic loading of the CPU port.

    To simplify the peripheral power circuit, the RTL8306M can use a low-cost PNP transistor to generate 1.8V from a 3.3V power supply.

      Basic Switching Functions
    • 6-port switch controller with memory and transceiver for 10Base-T and 100Base-TX with:
      • 5-port 10/100M UTP
      • 5-port 10/100M UTP + 1-port (T)MII/RMII
    • Supports MII/TMII/RMII for router applications, HomePNA, HomePlug, or VDSL solutions
    • Non-blocking wire-speed reception and transmission and non-head-of-line-blocking forwarding
    • Complies with IEEE 802.3/802.3u auto-negotiation
    • Built-in high efficiency SRAM for packet buffer, with 2K-entry lookup table and two 4-way associative hash algorithms
    • 2047 byte maximum packet length
    • Flow control fully supported:
      • Half duplex: Back pressure flow control
      • Full duplex: IEEE 802.3x flow control
      Service Quality
    • Supports high performance QoS function on each port:
      • Supports 4-level priority queues
      • Weighted round robin service
      • Supports strict priority
      • Input/Output port bandwidth control
      • Queue based bandwidth control
      • ACL-based, 1Q-based, Port-based, DSCP-based, VID-based, IP address-based, and other types of priority assignments
    • Supports 16-entry ACL for advanced applications
    • Supports IEEE 802.1p Traffic Re-marking
    • Supports IGMP v1/v2/v3 and MLD v1/v2 snooping
      Security and Management
    • Supports MAC Limit
    • Supports Port Isolation
    • Supports IEEE 802.1x
    • Lookup Table is accessible via SMI
    • Supports 32-bit smart counter for per port RX/TX byte/packet count, collision counter, and error counter
    • Supports reserved control frame filtering
    • Supports advanced storm filtering
    • Supports Port Mirroring
    • Supports interrupt for CPU application
    • Supports proprietary CPU tag for traffic management
    • Supports SMI (Serial Management Interface) for programming and diagnostics
    • Optional EEPROM interface for configuration
      VLAN Functions
    • Supports up to 16 VLAN groups
    • Flexible 802.1Q port/tag-based VLAN
    • Supports VLAN translation
    • Supports QinQ
    • Leaky VLAN for ARP/unicast/IP multicast packets
    • Supports external processor to maintain greater than 16 VLAN groups
      Power Saving Functions
    • Green Ethernet Features
      • Link-On and Cable Length Power Saving
      • Link-Down Power Saving
    • Supports Energy-Efficient Ethernet (EEE) function (IEEE 802.3az)
    • Supports Wake-on-LAN (WOL)
    • Supports system power management based on link and CPU port traffic loading
      Diagnostic Functions
    • Supports IEEE 802.1D
    • Supports hardware loop detection function, with LEDs to indicate the existence of a loop
    • Supports cable diagnosis (RTCT function)
    • Supports MAC and PHY loopback function for diagnosis
    • LED indicators:
      • One LED indicates all ports’ link status and activity
      • Loop status indication
      • LEDs blink upon reset for LED diagnostics
      Other Features
    • Optional MDI/MDIX auto crossover for plug-and-play
    • Physical layer port Polarity Detection and Correction function
    • Robust baseline wander correction for improved 100Base-TX performance
    • 25MHz crystal or 3.3V/1.8V OSC input
    • Single 3.3V power input can be transformed to 1.8V via a low-cost external BJT transistor
    • Low power, 1.8/3.3V, 0.153µm CMOS technology
    • 64-pin QFN package
    • 5-port switch (10Base-T & 100Base-TX)
    • xDSL/cable modem router or home gateway applications
    • HomePNA/HomePlug bridge solutions
    • Set-top box/TV


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