TNETX3270 ThunderSWITCH^TM 24/3 ETHERNET^TM SWITCH WITH 24 10-MBIT/S PORTS AND 3 10-/100-MBIT/S PORTS

SPWS043A - NOVEMBER 1997 - REVISED FEBRUARY 1998

features

• Port Configurations:
• 24 10-Mbit/s Ports
  • Ports Arranged in Three Groups of Eight Ports in a Multiplexed Interface
  • Direct Multiplexer Interface to TNETE2008
  • Full and Half Duplex
  • Half-Duplex Collision-Based Flow Control
  • Full-Duplex IEEE Std 802.3x Flow Control
  • Interoperable Support for IEEE Std 802.1Q VLAN
  • Speed, Duplex, and Pause Autonegotiation With Physical Layer (PHY)
• Three 10-/100-Mbit/s Ports
  • Direct Interface to TNETE2101
  • Full and Half Duplex
  • Half-Duplex Collision-Based Flow Control
  • Full-Duplex IEEE Std 802.3x Flow Control
  • Interoperable Support for IEEE Std 802.1Q VLAN
  • Pretagging Support
• Port Trunking and Load Sharing
• LED Indication of Port Status
• SDRAM Interface
  • Direct Interface to 8-Bit/Word and 16-Bit/Word, 16-Mbit, and 64-Mbit SDRAMs
  • 32-Bit-Wide Data Bus
  • Up to 32 Mbytes Supported
  • 83.33-MHz SDRAM Clock
  • 12-ns (-12) SDRAMs Required
• Remote Monitoring (RMON) Support - Groups 1, 2, 3, and 9
• Direct I/O (DIO) Management Interface
  • 8 Bits Wide
  • CPU Access to Statistics, Registers, and Management Information Bases (MIBs)
  • Internal Network Management Port
  • Forwards Spanning-Tree Packets to CPU
  • Serial Media-Independent Interface (MII) for PHY Control
• EEPROM Interface for Autoconfiguration (No CPU Required for Nonmanaged Switch)
• Internal Address-Lookup/Frame-Routing Engine
  • Interoperable Support for IEEE Std 802.1Q VLAN
  • Supports IEEE Std 802.1D Spanning Tree
  • 32 Assignable Virtual LANs (VLANs)
  • Multiple Forwarding Modes
  • 2K Total Addresses Supported
  • Port Mirroring
• IEEE Std 1149.1 (JTAG) Interface (3.3-V Signals)
• 2.5-V Process With 3.3-V-Drive I/O
• Packaged in 240-Terminal Plastic Quad Flat Package (PGV)

TI and ThunderSWITCH are trademarks of Texas Instruments Incorporated. Ethernet is a trademark of Xerox Corporation. Secure Fast Switching is a trademark of Cabletron Systems, Inc.

Port-trunking and load-sharing algorithms were contributed by Cabletron Systems, Inc. and are derived from, and compatible with, Secure Fast Switching^TM.

description

The TNETX3270 again proves Texas Instruments (TI^TM) commitment to providing higly integrated switching solutions that allow network designers to lower overall system costs. Based on TI ThunderSWITCH architecture, the TNETX3270 design integrates 24 full-duplex 10-Mbit/s ports and three full-duplex 10-/100-Mbit/s ports, as well as an address-lookup engine, all in a single 240-pin package. All ports on the TNETX3270 are designed to support multiple addresses, cut-through or store-and-forward modes of operation, and VLAN. The 10-/100-Mbit/s ports have media-independent interface (MII)-compatible interfaces and can be configured to work as MII uplinks to high-speed switching fabrics. All three of the 10-/100-Mbit/s ports are capable of being logically combined into a single high-performance uplink channel that can be used to provide up to 600-Mbit/s switch-to-switch connections.

The TNETX3270 incorporates an internal content-addressable memory (CAM) capable of supporting 2,048 end stations from a single switch. In addition, the device supports 32 user-configurable VLAN-broadcast domains (IEEE Std 802.1Q), which allows IEEE Std 802.1P priority support interoperability, IEEE Std 802.3X full-duplex flow control, and a collision-based flow-control scheme. The TNETX3270 also integrates an EEPROM interface that allows the device to be initialized and configured without the added expense of a CPU. All of these features on chip greatly reduce the number of external components required to build a switch.

The internal address-lookup engine (IALE) supports up to 2K unicast/multicast and broadcast addresses and up to 32 IEEE Std 802.1Q VLANs. For interoperability, each port can be programmed as an access port or non-access port to recognize VLAN tags and transmit frames with VLAN tags to other systems that support VLAN tagging. The IALE performs destination- and source-address comparisons and forwards unknown source- and destination-address packets to ports specified via programmable masks.

Figure 1. TNETX3270 Interface Block Diagram

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(c) Copyright 1998 Texas Instruments Incorporated. All rights reserved.
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