Document Outline
- Figure 1. LXT908 Block Diagram
- 1.0 Pin Assignments and Signal Descriptions
- 2.0 Functional Description
- 3.0 Application Information
- 4.0 Test Specifications
- Table 4. Absolute Maximum Values
- Table 5. Recommended Operating Conditions
- Table 6. I/O Electrical Characteristics
- Table 7. AUI Electrical Characteristics
- Table 8. Twisted-Pair Electrical Characteristics
- Table 9. Switching Characteristics
- Table 10. RCLK/Start-of-Frame Timing
- Table 11. RCLK/End-of-Frame Timing
- Table 12. Transmit Timing
- Table 13. Collision, COL/CI Output and Loopback Timing
- 4.1 Timing Diagrams for Mode 1 (MD2, 1, 0 = Low, Low, Low) Figures 16 - 21
- 4.2 Timing Diagrams for Mode 2 (MD2, 1, 0 = Low, Low, High) Figures 22 - 27
- 4.3 Timing Diagrams for Mode 3 (MD2, 1, 0 = Low, High, Low) Figures 28 - 33
- 4.4 Timing Diagrams for Mode 4 (MD2, 1, 0 = Low, High, High) Figures 34 - 39
- 4.5 Timing Diagrams for Mode 5 (MD2, 1, 0 = High, High, Low) Figures 40 - 45
- 5.0 Mechanical Specifications
- Appendix A Ordering Information
LXT908
Universal 3.3V 10BASE-T and AUI Transceiver
Datasheet
The LXT908 Universal 10BASE-T and AUI Transceiver is designed for IEEE 802.3 physical
layer applications. It provides 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, the LXT908 also supports full-duplex operation at 20 Mbps.
LXT908 functions include Manchester encoding/decoding, receiver squelch and transmit pulse
shaping, jabber, link testing and reversed polarity detection/correction. The LXT908 can be used
to drive either the AUI drop cable or the 10BASE-T twisted-pair cable with only a simple
isolation transformer. Integrated filters simplify the design work required for FCC-compliant
EMI performance.
The LXT908 is fabricated with an advanced CMOS process and requires only a single 3.3V
power supply.
Applications
Product Features
s
Access devices (DSL, Cable Modems, and
Set-top Boxes)
s
Routers/Bridges/Switches/Hubs
s
Telecom Backplane
s
USB to Ethernet Converters
Functional Features
s
Improved Filters - Simplifies FCC
Compliance
s
Integrated Manchester Encoder/Decoder
s
10BASE-T compliant Transceiver
s
AUI Transceiver
s
Supports Standard and Full-Duplex
Ethernet
Diagnostic Features
s
Four LED Drivers
s
AUI/RJ-45 Loopback
Convenience Features
s
Automatic/Manual AUI/RJ-45 Selection
s
Automatic Polarity Correction
s
SQE Disable/Enable function
s
Power Down Mode with tri-stated outputs
s
Four loopback modes
s
Single 3.3V operation
s
Available in 64-pin LQFP and 44-pin
PLCC package
s
Commercial (0 to +70C) and
Extended (-40 to +85C) temperature range
For technical assistance on this product, please call 1-800-628-8686, or
Order Number: 249049-002
send an e-mail to
support@mailbox.intel.com
. June
2001
2
Datasheet
Document #: 249049
Revision #: 002
Rev. Date: June 19, 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 LXT908 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
3
Document #: 249049
Revision #: 002
Rev. Date: June 19, 2001
Contents
Contents
1.0
Pin Assignments and Signal Descriptions
...................................................... 8
2.0
Functional Description
........................................................................................... 11
2.1
Introduction.......................................................................................................... 11
2.1.1
Controller Compatibility Modes .............................................................. 11
2.1.2
Transmit Function................................................................................... 12
2.1.3
Jabber Control Function ......................................................................... 12
2.1.4
Receive Function.................................................................................... 13
2.1.5
SQE Function ......................................................................................... 13
2.1.6
Polarity Reverse Function ...................................................................... 14
2.1.7
Loopback Function ................................................................................. 14
2.1.8
Collision Detection Function ................................................................... 15
2.1.9
Link Pulse Transmission ........................................................................ 16
2.1.10 Link Integrity Test Function .................................................................... 16
3.0
Application Information
......................................................................................... 18
3.1
External Components.......................................................................................... 18
3.1.1
Crystal Information ................................................................................. 18
3.1.2
Magnetic Information .............................................................................. 18
3.2
Layout Requirements .......................................................................................... 18
3.2.1
Auto Port Select with External Loopback Control................................... 18
3.2.2
Full Duplex Support................................................................................ 20
3.2.3
Dual Network Support-10Base T and Token Ring ................................. 21
3.2.4
Manual Port Select & Link Test Function ............................................... 22
3.2.5
Three Media Application......................................................................... 24
3.2.6
AUI Encoder/Decoder Only .................................................................... 25
4.0
Test Specifications
.................................................................................................. 26
4.1
Timing Diagrams for Mode 1 (MD2, 1, 0 = Low, Low, Low)
Figures 16
-
21
....... 30
4.2
Timing Diagrams for Mode 2 (MD2, 1, 0 = Low, Low, High)
Figures 22
-
27
...... 32
4.3
Timing Diagrams for Mode 3 (MD2, 1, 0 = Low, High, Low)
Figures 28
-
33
...... 34
4.4
Timing Diagrams for Mode 4 (MD2, 1, 0 = Low, High, High)
Figures 34
-
39
..... 36
4.5
Timing Diagrams for Mode 5 (MD2, 1, 0 = High, High, Low)
Figures 40
-
45
..... 38
5.0
Mechanical Specifications
.................................................................................... 40
A
Ordering Information
.............................................................................................. 43
Contents
4
Datasheet
Document #: 249049
Revision #: 002
Rev. Date: June 19, 2001
Figures
1
LXT908 Block Diagram ......................................................................................... 7
2
LXT908 Pin Assignments ...................................................................................... 8
3
LXT908 TPO Output Waveform ......................................................................... 12
4
Jabber Control Function ...................................................................................... 13
5
SQE Function ..................................................................................................... 14
6
Collision Detection Function ............................................................................... 15
7
Transmitted Link Integrity Pulse Timing ............................................................. 16
8
Link Integrity Test Function ................................................................................ 17
9
LAN Adapter Board - Auto Port Select with External Loopback Control ............ 19
10
Full-Duplex Operation ........................................................................................ 20
11
LXT908/380C26 Interface for Dual Network Support of 10BASE-T and
Token Ring
21
12
LAN Adapter Board - Manual Port Select with Link Test Function ..................... 22
13
Manual Port Select with Seeq 8005 Controller .................................................. 23
14
Three Media Application .................................................................................... 24
15
AUI Encoder/Decoder Only Application ............................................................. 25
16
Mode 1 RCLK/Start-of-Frame Timing ................................................................ 30
17
Mode 1 RCLK/End-of-Frame Timing .................................................................. 30
18
Mode 1 Transmit Timing .................................................................................... 31
19
Mode 1 Collision Detect Timing ......................................................................... 31
20
Mode 1 COL/SQE Output Timing/CI Output Timing .......................................... 31
21
Mode 1 Loopback Timing ................................................................................... 31
22
Mode 2 RCLK/Start-of-Frame Timing ................................................................ 32
23
Mode 2 RCLK/End-of-Frame Timing .................................................................. 32
24
Mode 2 Transmit Timing .................................................................................... 33
25
Mode 2 Collision Detect Timing ......................................................................... 33
26
Mode 2 COL/SQE Output Timing ....................................................................... 33
27
Mode 2 Loopback Timing ................................................................................... 33
28
Mode 3 RCLK/Start-of-Frame Timing ................................................................ 34
29
Mode 3 RCLK/End-of-Frame Timing .................................................................. 34
30
Mode 3 Transmit Timing .................................................................................... 35
31
Mode 3 Collision Detect Timing ......................................................................... 35
32
Mode 3 COL/SQE Output Timing ....................................................................... 35
33
Mode 3 Loopback Timing ................................................................................... 35
34
Mode 4 RCLK/Start-of-Frame Timing ................................................................ 36
35
Mode 4 RCLK/End-of-Frame Timing .................................................................. 36
36
Mode 4 Transmit Timing .................................................................................... 37
37
Mode 4 Collision Detect Timing ......................................................................... 37
38
Mode 4 COL/SQE Output Timing ....................................................................... 37
39
Mode 4 Loopback Timing ................................................................................... 37
40
Mode 5 RCLK/Start-of-Frame Timing ................................................................ 38
41
Mode 5 RCLK/End-of-Frame Timing .................................................................. 38
42
Mode 5 Transmit Timing .................................................................................... 39
43
Mode 5 Collision Detect Timing ......................................................................... 39
44
Mode 5 COL/SQE Output Timing ...................................................................... 39
45
Mode 5 Loopback Timing ................................................................................... 39
46
44-Pin PLCC Package Specifications ................................................................ 40
47
64-Pin LQFP Package Specifications ................................................................ 41
48
Ordering Information - Sample ............................................................................ 43
Datasheet
5
Document #: 249049
Revision #: 002
Rev. Date: June 19, 2001
Contents
Tables
1
LXT908 Signal Descriptions .................................................................................. 9
2
Controller Compatibility Mode Options................................................................ 12
3
Suitable Crystals ................................................................................................ 18
4
Absolute Maximum Values................................................................................. 26
5
Recommended Operating Conditions ................................................................ 26
6
I/O Electrical Characteristics .............................................................................. 26
7
AUI Electrical Characteristics ............................................................................. 27
8
Twisted-Pair Electrical Characteristics ............................................................... 27
9
Switching Characteristics ................................................................................... 28
10
RCLK/Start-of-Frame Timing.............................................................................. 28
11
RCLK/End-of-Frame Timing............................................................................... 29
12
Transmit Timing................................................................................................... 29
13
Collision, COL/CI Output and Loopback Timing................................................. 29
14
Product Information ............................................................................................. 43
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