TNETX15VE Datasheet, PDF (1/113 Pages) Texas Instruments – VLAN-ENGINE ADDRESS-LOOKUP DEVICE

TNETX15VE
VLAN-ENGINE ADDRESS-LOOKUP DEVICE
D Provides up to 2K-Address Matching
System
D VLAN Support for Single or Multiple
ThunderSWITCH™ Devices
D Provides Glueless External-Address Match
Interface to the TNETX3150/TNETX3150A
D Uses Standard Off-the-Shelf SRAMs
D EEPROM Interface for Auto-Configuration,
No CPU Needed
D Automatic Aging Through User-Selectable
Aging (AGE) Threshold
D Fabricated in 3.3-V Low-Voltage
Technology
D Requires 3.3-V and 5-V Power Supplies
D 5-V Tolerant I/Os
SPWS028B – APRIL 1997 – REVISED SEPTEMBER 1997
D Provides Direct Input/Output (DIO) Interface
for Management Access and Control of the
Address-Lookup Table
D Address Lookups, Adds, and Deletes Are
Automatically Performed in Hardware
D User-Selectable Interrupts Simplify the
Management Operations
D Provides Spanning-Tree Support
D Secure Addresses From Changing Ports
D MII Data I/O (MDIO) PHY Management
Interface
D Management Access to Statistic Registers
D Packaged in 144-Terminal Plastic Quad
Flatpack
D JTAG Compliant
description
The TNETX15VE performs the VLAN-engine address-lookup function for the TNETX3150/TNETX3150A
Ethernet™ switch using a glueless interface. The TNETX15VE device determines the addresses to use and
match from the TNETX3150/TNETX3150A DRAM bus. The address-lookup table is maintained in external
SRAM. The frame-matching and routing information is given to the TNETX3150/TNETX3150A through the
external address-matching (EAM) interface.
The TNETX15VE is designed to work in either unmanaged or managed mode. Unmanaged operation is
accomplished through EEPROM support. Startup options are auto-loaded into the TNETX15VE registers using
the EEPROM interface. If the TNETX15VE is initialized by automatic loading from the EEPROM, it begins
operation automatically.
All functions of this device are fully controllable by management through a direct input/output (DIO) interface.
In addition, this device can interrupt the external management processor with user-selectable interrupts.
This device also provides support for easy management control of IEEE Std 802.3u media-independent
interface (MII) managed devices. A typical application is shown in the following:
SRAM
EEPROM
DRAM
MII-Managed
Devices (optional)
MDIO
VLAN-Engine
Address-
Lookup Device
TNETX15VE
EINT
DIO
EAM
DRAS
DCAS
DWE
DD35–DD0
Microprocessor
(optional)
ThunderSWITCH
TNETX3150/TNETX3150A
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.
ThunderSWITCH is a trademark of Texas Instruments Incorporated
Ethernet is a trademark of Xerox Corporation.
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.
Copyright © 1997, Texas Instruments Incorporated
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