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TNETX3150A Datasheet

  • TNETX3150A

  • ADDRESS-LOOKUP DEVICE

  • 78頁

  • TI

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TNETX15AE
ADDRESS-LOOKUP DEVICE
SPWS041A 鈥?AUGUST 1997 鈥?REVISED OCTOBER 1997
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Provides up to 8K-Address Matching
System
Provides Glueless External-Address
Match (EAM) Interface to the
TNETX3150/TNETX3150A/TNETX3100
Uses Standard Off-the-Shelf 15-ns SRAMs
EEPROM Interface for Auto-Configuration,
No CPU Needed
Automatic Aging Through User-Selectable
Aging (AGE) Threshold
Fabricated in 3.3-V Low-Voltage
Technology
Requires 3.3-V and 5-V Power Supplies
5-V Tolerant I/Os
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Provides Direct Input/Output (DIO) Interface
for Management Access and Control (MAC)
of the Address-Lookup Table
Address Lookups, Adds, and Deletes Are
Automatically Performed in Hardware
User-Selectable Interrupts Simplify the
Management Operations
Secure Addresses From Changing Ports
MII Data I/O (MDIO) PHY Management
Interface
Management Access to Statistic Registers
JTAG Compliant
Packaged in 144-Terminal Plastic Quad
Flatpack
description
The TNETX15AE performs the address-lookup function for either the TNETX3150/TNETX3150A or the
TNETX3100 Ethernet鈩?switch. The TNETX15AE device determines the addresses to use and match from the
TNETX3150/TNETX3150A/TNETX3100 DRAM bus. The address-lookup table is maintained in external
SRAM. The frame-matching and routing information is given to the TNETX3150/TNETX3150A/TNETX3100
through the external address-matching (EAM) interface.
The TNETX15AE is designed to work in either unmanaged or managed mode. Unmanaged operation is
accomplished through EEPROM support. Startup options are auto-loaded into the TNETX15AE registers using
the EEPROM interface. If the TNETX15AE 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 Figure 1.
MII-Managed Devices (Optional)
EINT
MDIO
SRAM
Address-Lookup
Device
TNETX15AE
EEPROM
DD35鈥揇D0
DRAS
DRAM
DWE
DCAS
EAM
DIO
Microprocessor
(Optional)
ThunderSWITCH鈩?/div>
TNETX3150/
TNETX3150A/
TNETX3100
Figure 1. TNETX15AE Typical Application
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 and ThunderSWITCH are trademarks 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
漏
1997, Texas Instruments Incorporated
POST OFFICE BOX 655303
鈥?/div>
DALLAS, TEXAS 75265
1

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