Filter
Top Products
TNETX4090
ThunderSWITCH II
9-PORT 100-/1000-MBIT/S ETHERNET
SWITCH
SPWS044E – DECEMBER 1997 – REVISED AUGUST 1999
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Single-Chip 100-/1000-Mbit/s Device
Integrated Physical Coding Sublayer (PCS)
Logic Provides Direct Interface to Gigabit
Transceivers
Integrated Address-Lookup Engine and
Table Memory for 2-K Addresses
Supports IEEE Std 802.1Q Virtual-LAN
(VLAN) Tagging Scheme
Provides Data Path for Network
Management Information [No External
Media-Access Control (MAC) Required]
Full-Duplex IEEE Std 802.3 Flow Control
Half-Duplex Back-Pressure Flow Control
Fully Nonblocking Architecture Using
High-Bandwidth Rambus Memory
Simple Expansion Via the Gigabit Interface
for Higher-Density Port Solutions
Port Trunking/Load Sharing for
High-Bandwidth Interswitch Links
Supports Pretag Extended Port Awareness
EEPROM Interface for Autoconfiguration
(No CPU Required for Nonmanaged Switch)
Provides Direct Input/Output (DIO) Interface
for Configuration and Statistics Information
Supports On-Chip Per-Port Storage for
Etherstat and Remote Monitoring (RMON)
Management Information Bases (MIBs)
Fabricated in 2.5-/3.3-V Low-Voltage
Technology
Supports Ring-Cascade Mode
Supports Spanning Tree
Packaged in 352-Terminal Ball Grid Array
Package
description
The TNETX4090 is a 9-port 100-/1000-Mbit/s nonblocking Ethernet switch with an on-chip address-lookup
engine. The TNETX4090 provides a low-cost, high-performance switch solution. The TNETX4090 is a fully
manageable desktop switch solution achieved by combining the TNETX4090 with physical interfaces and
high-bandwidth rambus-based packet memory and a CPU. The TNETX4090 also provides an interface capable
of receiving and transmitting simple-network management protocol (SNMP) and bridge protocol data units
(BPDU) (spanning tree) frames.
The TNETX4090 provides eight 10-/100-Mbit/s interfaces and one 100-/1000-Mbit/s interface. 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. Port 8 supports 2 Gbit/s to desktops,
high-speed servers, hubs, or other switches in the full-duplex mode. The physical coding sublayer (PCS)
function is integrated on chip to provide a direct 10-bit interface to the gigabit Ethernet transceiver. The
TNETX4090 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. In the ring-cascade mode, port 8
can be used to connect multiple devices in a ring topology, which provides a low-cost, high-port-density desktop
switch. Pretagging and extended port awareness allow the TNETX4090 to be used as a front end to a router
or crossbar switch to build a cost-effective, high-density, high-performance system.
The internal address-lookup engine (IALE) supports up to 2-K unicast/multicast and broadcast addresses and
up to 64 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.
Copyright 1998, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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.