TNETX4080 Datasheet, PDF (1/64 Pages) Texas Instruments – ThunderSWITCH IIE 8-PORT 10-/100-MBIT/S ETHERNETE SWITCH

TNETX4080
ThunderSWITCH II^™ 8-PORT 10-/100-MBIT/S ETHERNET^™ SWITCH
D Single-Chip 100-Mbit/s Device
D Integrated Address-Lookup Engine and
Table Memory for 1-K Addresses
D Supports IEEE Std 802.1Q Virtual-LAN
(VLAN) Tagging Scheme
D Provides Data Path for Network
Management Information [No External
Media-Access Control (MAC) Required]
D Full-Duplex IEEE Std 802.3 Flow Control
D Half-Duplex Back-Pressure Flow Control
D Fully Nonblocking Architecture Using
High-Bandwidth Rambus Memory
D Port Trunking/Load Sharing for
High-Bandwidth Interswitch Links
SPWS050A – AUGUST 1998 – REVISED NOVEMBER 1998
D EEPROM Interface for Autoconfiguration
(No CPU Required for Nonmanaged Switch)
D Provides Direct Input/Output (DIO) Interface
for Configuration and Statistics Information
D Supports On-Chip Per-Port Storage for
Etherstat™ and Remote Monitoring (RMON)
Management Information Bases (MIBs)
D Fabricated in 2.5-/3.3-V Low-Voltage
Technology
D Supports Spanning Tree
D Packaged in 352-Pin Ball Grid Array
Package
description
The TNETX4080 is an 8-port 100-Mbit/s nonblocking Ethernet™ switch with an on-chip address-lookup engine.
The TNETX4080 provides a low-cost, high-performance switch solution. The TNETX4080 is a fully manageable
desktop switch solution achieved by combining the TNETX4080 with physical interfaces and high-bandwidth
rambus-based packet memory and a CPU. The TNETX4080 also provides an interface capable of receiving
and transmitting simple-network management protocol (SNMP) and bridge protocol data units (BPDU)
(spanning-tree) frames.
The TNETX4080 provides eight 10-/100-Mbit/s interfaces. In half-duplex mode, all ports support back-pressure
flow control to reduce the risk of data loss for a long burst of activity. In the full-duplex mode of operation, the
device uses IEEE Std 802.3 frame-based flow control. With full-duplex capability, ports 0–7 support 200-Mbit/s
aggregate bandwidth connections. The TNETX4080 also supports port trunking/load sharing on the
10-/100-Mbit ports. This can be used to group ports on interswitch links to increase the effective bandwidth
between the systems.
The internal address-lookup engine (IALE) supports up to 1-K unicast/multicast and broadcast addresses and
up to 16 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.
Statistics for the Etherstat, SNMP, and remote monitoring management information base (RMON MIB) are
independently collected for each of the eight ports. Access to the statistics counters is provided via the direct
input/output (DIO) interface. Management frames can be received and transmitted via the DIO interface,
creating a complete network management solution. Figure 1 is a block diagram of the TNETX4080.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
TI, ThunderSWITCH, and ThunderSWITCH II are trademarks of Texas Instruments Incorporated.
Ethernet and Etherstat are trademarks 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™.
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
Copyright © 1998, Texas Instruments Incorporated
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