Intel
®
LXT914 Flexible Quad Ethernet
Repeater
Datasheet
The Intel
®
LXT914 Flexible Quad Ethernet Repeater (called hereafter the LXT914 Repeater) is
an integrated multi-port repeater designed for mixed-media networks. It provides all the active
circuitry required for the repeater function in a single CMOS device. It includes one Attachment
Unit Interface (AUI) port and four 10BASE-T transceivers. The AUI port is mode selectable:
DTE mode allows connection of an external transceiver (10BASE2, 10BASE5, 10BASE-T or
FOIRL) or a drop cable. MAU mode creates a MAU output allowing direct connection to
another DTE interface. The 10BASE-T transceivers are entirely self-contained with internal
filters which simplify the design work required for FCC-compliant EMI performance.
An inter-repeater backplane interface allows 128 or more 10BASE-T ports to be cascaded
together. In addition, a serial port provides information for network management.
The LXT914 Repeater requires only a single 5-volt power supply due to an advanced CMOS
fabrication process.
Product Features
■
■
■
■
■
■
■
Four integrated 10BASE-T transceivers
and one AUI transceiver on a single chip
Programmable DTE/MAU interface on
AUI port
Seven integrated LED drivers with four
unique operational modes
On-chip transmit and receive filtering
Automatic partitioning of faulty ports,
enabled on an individual port basis
Automatic polarity detection and correction
Programmable squelch level allows
extended range in low-noise environments
■
■
■
■
■
Synchronous or asynchronous inter-
repeater backplane supports “hot
swapping”
Inter-repeater backplane allows cascaded
repeaters, linking 128 or more 10BASE-T
ports
Serial port for selecting programmable
options
68-pin PLCC (Commercial or Extended
temp range)
100-pin PQFP (Commercial temp range)
Applications
■
■
LAN Repeaters
Integrated Repeaters
■
Switched Repeater Clusters
Order Number: 248989, Revision: 003
31-Oct-2005
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estoppel or otherwise, to any such patents, trademarks, copyrights, or other intellectual property rights.
The Intel
®
LXT914 Flexible Quad Ethernet Repeater may contain design defects or errors known as errata which may cause the product to deviate
from published specifications. Current characterized errata are available on request.
Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order.
Copies of documents which have an order number and are referenced in this document, or other Intel literature may be obtained by calling
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Copyright © 2005, Intel Corporation. All Rights Reserved.
31-Oct-2005
2
Intel
®
LXT914 Flexible Quad Ethernet Repeater
Order Number: 248989, Revision: 003
Datasheet
Intel
®
LXT914 Flexible Quad Ethernet Repeater
Contents
1.0
2.0
LXT914 Pin Assignments and Signal Descriptions....................................................................7
Functional Description................................................................................................................
14
2.1
2.2
Introduction ......................................................................................................................... 14
External Interfaces .............................................................................................................. 14
2.2.1 10BASE-T Ports .................................................................................................... 14
2.2.2 AUI Port ................................................................................................................. 14
2.2.3 Serial Port .............................................................................................................. 14
2.2.4 Inter-Repeater Backplane ...................................................................................... 15
2.2.4.1 Synchronous IRB Operation ..................................................................15
2.2.4.2 Asynchronous IRB Operation ................................................................ 15
Internal Repeater Circuitry .................................................................................................. 15
Initialization ......................................................................................................................... 16
2.4.1 Local Management Mode Initialization ..................................................................16
2.4.2 External Management Mode Initialization .............................................................. 19
10BASE-T Port Operation .................................................................................................. 20
2.5.1 10BASE-T Reception............................................................................................. 20
2.5.1.1 Programmable Internal Squelch Level................................................... 21
2.5.1.2 Polarity Detection and Correction .......................................................... 21
2.5.2 10BASE-T Transmission ....................................................................................... 21
2.5.3 10BASE-T Link Integrity Testing............................................................................ 21
AUI Port Operation ............................................................................................................. 22
2.6.1 AUI Reception........................................................................................................22
2.6.2 AUI Transmission .................................................................................................. 22
2.6.3 AUI Mode Selection (DTE/MAU)............................................................................ 22
Collision Handling ...............................................................................................................23
Security Mode ..................................................................................................................... 23
LED Display ........................................................................................................................ 23
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
Application Information
.............................................................................................................. 27
3.1
Layout Requirements.......................................................................................................... 27
3.1.1 The Twisted Pair Interface .....................................................................................27
3.1.2 The RBIAS Pin....................................................................................................... 27
12-Port Hub Repeater......................................................................................................... 27
8-Port Print or File Server ................................................................................................... 28
3.2
3.3
4.0
5.0
Test Specifications
......................................................................................................................35
Package Specifications...............................................................................................................40
5.1
Top-Label Marking .............................................................................................................. 42
6.0
Product Ordering Information
.................................................................................................... 44
Datasheet
Intel
®
LXT914 Flexible Quad Ethernet Repeater
Order Number: 248989, Revision: 003
31-Oct-2005
3
Intel
®
LXT914 Flexible Quad Ethernet Repeater
Figures
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Block Diagram .............................................................................................................................. 7
Pin Assignments ........................................................................................................................... 8
Global State Machine ................................................................................................................. 17
Partitioning State Machine.......................................................................................................... 18
Integrated LED Driver Indications............................................................................................... 26
12-Port Application Schematic, 68-Pin PLCC Package (Sheet 1 of 4)....................................... 29
12-Port Application Schematic, 68-Pin PLCC Package (Sheet 2 of 4)....................................... 30
12-Port Application Schematic, 68-Pin PLCC Package (Sheet 3 of 4)....................................... 31
12-Port Application Schematic, 68-Pin PLCC Package (Sheet 4 of 4)....................................... 32
8-Port Application Schematic, LED Mode 1 with AUISEL = MAU (Sheet 1 of 2) ....................... 33
8-Port Application Schematic, LED Mode 1 with AUISEL = MAU (Sheet 2 of 2) ....................... 34
Serial Port Timing ....................................................................................................................... 38
Inter-Repeater Bus Timing ......................................................................................................... 39
LXT914PC/PE Package Specifications ...................................................................................... 40
LXT914QC Package Specifications ........................................................................................... 41
Sample PLCC Package - Intel
®
LXT914 Repeater .................................................................... 42
Sample Pb-Free (RoHS-Compliant) PLCC Package - Intel
®
LXT914 Repeater ........................ 42
Sample PQFP Package - Intel
®
LXT914 Repeater .................................................................... 43
Sample Pb-Free (RoHS-Compliant) PQFP Package - Intel
®
LXT914 Repeater ........................ 43
Ordering Information Matrix – Sample........................................................................................ 45
Tables
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Power, Ground, and Clock Signal Descriptions............................................................................ 9
Inter-Repeater Backplane Signal Descriptions ........................................................................... 10
Mode Select and Control Signal Descriptions ............................................................................ 10
Serial Port Signal Descriptions (External Management Mode) .................................................. 11
Serial Port Signal Descriptions (Local Management Mode) ....................................................... 11
Miscellaneous Control Signal Descriptions ................................................................................ 12
LED Driver Signal Descriptions .................................................................................................. 12
Repeater Port Signal Descriptions ............................................................................................. 13
Setup Register Bit Assignments ................................................................................................. 19
Setup Register Bit Definitions ..................................................................................................... 19
Packet Status Register Bit Assignments .................................................................................... 20
Packet Status Register Bit Definitions ........................................................................................ 20
AUI Mode Selection (DTE/MAU) ................................................................................................ 22
LED Mode Selection ................................................................................................................... 24
Mode 0 (Default) LED Truth Table ............................................................................................. 24
Mode 1 LED Truth Table ............................................................................................................ 24
Mode 2 LED Truth Table ............................................................................................................ 25
Mode 3 LED Truth Table ............................................................................................................ 25
Manufacturers Magnetics List..................................................................................................... 28
Absolute Maximum Ratings ........................................................................................................ 35
Recommended Operating Conditions ........................................................................................ 35
I/O Electrical Characteristics
1
..................................................................................................... 35
AUI Electrical Characteristics ..................................................................................................... 36
Twisted-Pair Electrical Characteristics ....................................................................................... 36
IRB Electrical Characteristics ..................................................................................................... 37
31-Oct-2005
4
Intel
®
LXT914 Flexible Quad Ethernet Repeater
Order Number: 248989, Revision: 003
Datasheet
Intel
®
LXT914 Flexible Quad Ethernet Repeater
26
27
28
29
Switching Characteristics............................................................................................................ 37
Serial Port Timing—External Mode ............................................................................................37
Inter-Repeater Bus Timing.......................................................................................................... 38
Product Ordering Information ..................................................................................................... 44
Datasheet
Intel
®
LXT914 Flexible Quad Ethernet Repeater
Order Number: 248989, Revision: 003
31-Oct-2005
5
