LXT901/907
Universal 10BASE-T and AUI Transceivers
Datasheet
The LXT901 and LXT907 Universal 10BASE-T and AUI Transceivers are designed for IEEE
802.3 physical layer applications. They provide all the active circuitry to interface most standard
802.3 controllers to either the 10BASE-T media or Attachment Unit Interface (AUI). In
addition to standard 10 Mbps Ethernet, they also support full-duplex operation at 20 Mbps.
The LXT901 and LXT907 are identical except for the function of one pin. The LXT901 offers
selectable termination impedance to allow the use of either shielded or unshielded twisted-pair
cable. The LXT907 offers a signal quality error (SQE) disable function.
Common LXT901 and LXT907 functions include Manchester encoding/decoding, receiver
squelch and transmit pulse shaping, jabber, link testing and reversed polarity detection/
correction. Integrated filters simplify the design work required for FCC-compliant EMI
performance.
Applications
s
10BASE-T hub and switching products
s
Computer/Workstation 10BASE-T LAN
adapters
Product Features
Functional Features
s
s
s
s
Convenience Features
s
s
s
s
s
s
s
Integrated Manchester Encoder/Decoder
10BASE-T Transceiver
AUI Transceiver
Full-Duplex Capable (20 Mbps)
Diagnostic Features
s
s
s
Four LED Drivers
AUI/RJ45 Loopback
Remote Signaling of Link Down and
Jabber conditions
Automatic/Manual AUI/RJ45 Selection
Automatic Polarity Correction
SQE Disable function (LXT907
only)
Programmable Impedance Driver (LXT901
only)
Power Down Mode and four loopback
modes
LXT901 available in 64-pin LQFP and 44-
pin PLCC
LXT907 available in 44-pin PLCC
As of January 15, 2001, this document replaces the Level One document
LXT901/907 — Universal 10BASE-T and AUI Transceivers.
Order Number: 249097-001
January 2001
Information in this document is provided in connection with Intel
®
products. No license, express or implied, by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Intel’s Terms and Conditions of Sale for such products, Intel assumes no liability
whatsoever, and Intel disclaims any express or implied warranty, relating to sale and/or use of Intel products including liability or warranties relating to
fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. Intel products are not
intended for use in medical, life saving, or life sustaining applications.
Intel may make changes to specifications and product descriptions at any time, without notice.
Designers must not rely on the absence or characteristics of any features or instructions marked "reserved" or "undefined." Intel reserves these for
future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them.
The LXT901/907 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 ordering number and are referenced in this document, or other Intel literature may be obtained by calling 1-800-
548-4725 or by visiting Intel’s website at http://www.intel.com.
Copyright © Intel Corporation, 2001
*Third-party brands and names are the property of their respective owners.
Datasheet
Universal 10BASE-T and AUI Transceivers — LXT901/907
Contents
1.0
2.0
Pin Assignments and Signal Descriptions
...................................................... 8
Functional Description
...........................................................................................12
2.1
2.2
Controller Compatibility Modes ...........................................................................13
Transmit Function................................................................................................13
2.2.1 Jabber Control Function .........................................................................14
2.2.2 SQE Function .........................................................................................14
2.2.2.1 SQE Disable Function (LXT907 only) ......................................15
Receive Function.................................................................................................15
2.3.1 Polarity Reverse Function ......................................................................16
2.3.2 Collision Detection Function...................................................................16
Loopback Functions ............................................................................................17
2.4.1 Standard TP Loopback...........................................................................17
2.4.2 External Loopback..................................................................................17
2.4.3 Forced TP Loopback ..............................................................................17
2.4.4 AUI Loopback.........................................................................................17
Link Integrity Test Function .................................................................................17
2.5.1 Remote Signaling ...................................................................................19
Twisted-Pair Impedance Matching ......................................................................20
Crystal Information ..............................................................................................20
Magnetics Information .........................................................................................21
Typical Applications.............................................................................................21
3.4.1 Auto Port Select with External Loopback Control...................................21
3.4.2 Full Duplex Support................................................................................24
3.4.3 Dual Network Support - 10Base-T and Token Ring ...............................25
3.4.4 Manual Port Select with Link Test Function ...........................................26
3.4.5 Three Media Application.........................................................................28
3.4.6 AUI Encoder/Decoder ONLY..................................................................29
3.4.7 150
Ω
Shielded Twisted-Pair Only (LXT901 only)..................................30
Timing Diagrams for Mode 1 (MD1 = Low, MD0 = Low)
Figure 17
through
Figure 22................................................................................35
Timing Diagrams for Mode 2 (MD1=Low, MD0=High)
Figure 23
through
Figure 28................................................................................37
Timing Diagrams for Mode 3 (MD1 = High, MD0 = Low)
Figure 29
through
Figure 36................................................................................39
Timing Diagrams for Mode 4 (MD1 = High, MD0 = High)
Figure 37
through
Figure 42................................................................................42
2.3
2.4
2.5
3.0
Application Information
.........................................................................................20
3.1
3.2
3.3
3.4
4.0
Test Specifications
..................................................................................................31
4.1
4.2
4.3
4.4
5.0
Mechanical Specifications
....................................................................................44
Datasheet
3
LXT901/907 — Universal 10BASE-T and AUI Transceivers
Figures
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
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
LXT901/907 Block Diagram .................................................................................. 7
LXT901/907 Pin Assignments............................................................................... 8
LXT901/907 TPO Output Waveform .................................................................. 13
Jabber Control Function ..................................................................................... 14
SQE Function ..................................................................................................... 15
Collision Detection Function ............................................................................... 16
Link Integrity Test Function ................................................................................ 18
Remote Signaling Link Integrity Pulse Timing .................................................... 19
LAN Adapter Board - Auto Port Select with External LPBK Control .................. 23
Full-Duplex Operation ........................................................................................ 24
380C26 Interface for Dual Network Support of 10BASE-T and Token Ring ...... 25
LAN Adapter Board - Manual Port Select with Link Test Function ..................... 26
Manual Port Select with Seeq 8005 Controller .................................................. 27
Three Media Application .................................................................................... 28
AUI Encoder/Decoder Only Application ............................................................. 29
150
Ω
Shielded Twisted-Pair Only Application (LXT901) ................................... 30
Mode 1 RCLK/Start-of-Frame Timing ................................................................ 35
Mode 1 RCLK/End-of-Frame Timing .................................................................. 35
Mode 1 Transmit Timing .................................................................................... 36
Mode 1 Collision Detect Timing ......................................................................... 36
Mode 1 COL/CI Output Timing ........................................................................... 36
Mode 1 Loopback Timing ................................................................................... 36
Mode 2 RCLK/Start-of-Frame Timing ................................................................ 37
Mode 2 RCLK/End-of-Frame Timing .................................................................. 37
Mode 2 Transmit Timing .................................................................................... 38
Mode 2 Collision Detect Timing ......................................................................... 38
Mode 2 COL/CI Output Timing ........................................................................... 38
Mode 2 Loopback Timing ................................................................................... 38
Mode 3 RCLK/Start-of-Frame Timing (LXT901 only) ....................................... 39
Mode 3 RCLK/End-of-Frame Timing (LXT901 only) .......................................... 39
Mode 3 RCLK/Start-of-Frame Timing (LXT907 only) ....................................... 40
Mode 3 RCLK/End-of-Frame Timing (LXT907 only) .......................................... 40
Mode 3 Transmit Timing .................................................................................... 41
Mode 3 Collision Detect Timing ......................................................................... 41
Mode 3 COL/CI Output Timing ........................................................................... 41
Mode 3 Loopback Timing ................................................................................... 41
Mode 4 RCLK/Start-of-Frame Timing ................................................................ 42
Mode 4 RCLK/End-of-Frame Timing .................................................................. 42
Mode 4 Transmit Timing .................................................................................... 43
Mode 4 Collision Detect Timing ......................................................................... 43
Mode 4 COL/CI Output Timing ........................................................................... 43
Mode 4 Loopback Timing ................................................................................... 43
LXT901/907 Package Specifications .................................................................. 44
4
Datasheet
Universal 10BASE-T and AUI Transceivers — LXT901/907
Tables
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
LXT901/907 Signal Descriptions ........................................................................... 9
Controller Compatibility Modes ...........................................................................13
Crystal Specifications ..........................................................................................20
Suitable Crystals .................................................................................................20
Suitable Magnetics ..............................................................................................21
Absolute Maximum Ratings.................................................................................31
Recommended Operating Conditions .................................................................31
I/O Electrical Characteristics ...............................................................................31
AUI Electrical Characteristics ..............................................................................32
TP Electrical Characteristics ...............................................................................32
Switching Characteristics ....................................................................................33
RCLK/Start-of-Frame Timing...............................................................................33
RCLK/End-of-Frame Timing................................................................................33
Transmit Timing...................................................................................................34
Collision, COL/CI Output and Loopback Timing..................................................34
Datasheet
5
京公网安备 11010802033920号
EEWORLD
