Cortina Systems
®
LXT901A and LXT907A
PHY Transceivers
Datasheet: Long Form
The Cortina Systems
®
LXT901A and LXT907A PHY Transceivers(LXT901A/907A PHY) are new
generation Universal Ethernet Transceivers with improved noise immunity and output filtering. The
feature set of the LXT901A/907A PHY has been streamlined, removing Remote Signaling capabilities.
The LXT901A/907A PHY provide all the active circuitry to interface most standard 802.3 controllers to
either the 10BASE-T media or Attachment Unit Interface (AUI).
The LXT901A PHY and LXT907A PHY are identical except for the function of one pin. The
LXT901A PHY, with selectable termination impedance allows the use of either shielded or unshielded
twisted-pair cable. The LXT907A PHY offers a Signal Quality Error disable (DSQE) function.
LXT901A/907A PHY functions include Manchester encoding/decoding, receiver squelch and transmit
pulse shaping, jabber, link testing and reversed polarity detection/correction.
Applications
10BASE-T hub and switching products
Computer/workstation 10BASE-T LAN adapter
boards
Features
Functional Features
Integrated Filters - Simplify FCC Compliance
Integrated Manchester Encoder/Decoder
10BASE-T Transceiver
AUI Transceiver
Full-Duplex Capable (20 Mbps)
Convenience Features
Automatic/Manual AUI/RJ-45 Selection
Automatic Polarity Correction
SQE Disable function (LXT907A PHY)
Programmable Impedance Driver
(LXT901A PHY)
Single 3.3V operation
Power Down Mode and four loopback modes
Available in 64-pin LQFP and 44-pin PLCC
packages
Commercial (0 to +70
o
C)
Diagnostic Features
Four LED Drivers
AUI/RJ-45 Loopback
249098, Revision 4.0
LXT901A/907A PHY
Datasheet: Long Form
249098, Revision 4.0
03 December 2007
Legal Disclaimers
INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH CORTINA SYSTEMS
®
PRODUCTS.
NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS
GRANTED BY THIS DOCUMENT.
EXCEPT AS PROVIDED IN CORTINA’S TERMS AND CONDITIONS OF SALE OF SUCH PRODUCTS, CORTINA ASSUMES
NO LIABILITY WHATSOEVER, AND CORTINA DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY RELATING TO THE
SALE AND/OR USE OF CORTINA PRODUCTS, INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A
PARTICULAR PURPOSE, MERCHANTABILITY OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER
INTELLECTUAL PROPERTY RIGHT.
Cortina products are not intended for use in medical, life saving, life sustaining, critical control or safety systems, or in nuclear
facility applications.
CORTINA SYSTEMS®, CORTINA™, and the Cortina Earth Logo are trademarks or registered trademarks of Cortina Systems, Inc.
or its subsidiaries in the US and other countries. Any other product and company names are the trademarks of their respective owners.
Copyright © 2001−2007 Cortina Systems, Inc. All rights reserved.
Cortina Systems
®
LXT901A and LXT907A PHY Transceivers
Page 2
LXT901A/907A PHY
Datasheet: Long Form
249098, Revision 4.0
03 December 2007
Contents
Contents
1.0
2.0
Pin Assignments and Signal Descriptions ................................................................................. 4
Functional Description.................................................................................................................. 8
2.1
2.2
2.3
2.4
Controller Compatibility Modes ............................................................................................. 8
Transmit Function ................................................................................................................. 9
2.2.1 Jabber Control Function .......................................................................................... 9
2.2.2 SQE Function ........................................................................................................10
Receive Function ................................................................................................................11
2.3.1 Polarity Reverse Function......................................................................................11
2.3.2 Collision Detection Function ..................................................................................12
Loopback Functions............................................................................................................13
2.4.1 Standard TP Loopback ..........................................................................................13
2.4.2 Forced TP Loopback .............................................................................................13
2.4.3 AUI Loopback ........................................................................................................13
2.4.4 External Loopback .................................................................................................13
Link Integrity Test Function.................................................................................................13
Link Pulse Transmission ..................................................................................................... 15
Twisted-Pair Impedance Matching .....................................................................................16
Crystal Information..............................................................................................................16
Magnetics Information ........................................................................................................16
Typical Applications ............................................................................................................16
3.4.1 Auto Port Select with External Loopback Control ..................................................16
3.4.2 Full-Duplex Support ...............................................................................................19
3.4.3 Dual Network Support - 10Base-T and Token Ring...............................................20
3.4.4 Manual Port Select with Link Test Function...........................................................21
3.4.5 Three Media Application ........................................................................................23
3.4.6 AUI Encoder/Decoder Only ...................................................................................23
3.4.7 150 Ohm Shielded Twisted-pair only (LXT901A PHY only)...................................25
Timing Diagrams for Mode 1
(MD1 = Low, MD0 = Low)
Figure 17
through
Figure 22
.....................................................30
Timing Diagrams for Mode 2
(MD1=Low, MD0=High)
Figure 23
through
Figure 28
........................................................32
Timing Diagrams for Mode 3
(MD1 = High, MD0 = Low)
Figure 29
through
Figure 36
....................................................34
Timing Diagrams for Mode 4
(MD1 = High, MD0 = High)
Figure 37
through
Figure 42....................................................37
2.5
2.6
3.0
3.1
3.2
3.3
3.4
Application Information ..............................................................................................................16
4.0
Test Specifications......................................................................................................................26
4.1
4.2
4.3
4.4
5.0
Mechanical Specifications ..........................................................................................................40
Cortina Systems
®
LXT901A and LXT907A PHY Transceivers
Page 1
LXT901A/907A PHY
Datasheet: Long Form
249098, Revision 4.0
03 December 2007
Figures
Figures
1
2
3
4
5
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7
8
9
10
11
12
13
14
15
16
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18
19
20
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25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
LXT901A/907A PHY Block Diagram ............................................................................................... 3
LXT901A/907A PHY Pin Assignments ............................................................................................ 4
TPO Output Waveform ................................................................................................................... 9
Jabber Control Function ...............................................................................................................10
SQE Function ...............................................................................................................................11
Collision Detection Function .........................................................................................................12
Link Integrity Test Function ..........................................................................................................14
Transmitted Link Integrity Pulse Timing .......................................................................................15
LAN Adapter Board - Auto Port Select with External LPBK Control .............................................18
Full-Duplex Operation ...................................................................................................................19
380C26 Interface for Dual Network Support of 10BASE-T and Token Ring ................................20
LAN Adapter Board - Manual Port Select with Link Test Function ................................................21
Manual Port Select with Seeq* 8005 Controller ...........................................................................22
Three Media Application ...............................................................................................................23
AUI Encoder/Decoder Only Application ........................................................................................ 24
150 Ohm Shielded Twisted-Pair Only Application (LXT901A PHY) .............................................25
Mode 1 RCLK/Start-of-Frame Timing ........................................................................................... 30
Mode 1 RCLK/End-of-Frame Timing ............................................................................................30
Mode 1 Transmit Timing ...............................................................................................................31
Mode 1 Collision Detect Timing ....................................................................................................31
Mode 1 COL/CI Output Timing .....................................................................................................31
Mode 1 Loopback Timing .............................................................................................................32
Mode 2 RCLK/Start-of-Frame Timing ........................................................................................... 32
Mode 2 RCLK/End-of-Frame Timing ............................................................................................33
Mode 2 Transmit Timing ...............................................................................................................33
Mode 2 Collision Detect Timing ....................................................................................................33
Mode 2 COL/CI Output Timing .....................................................................................................34
Mode 2 Loopback Timing .............................................................................................................34
Mode 3 RCLK/Start-of-Frame Timing (LXT901A PHY) ................................................................34
Mode 3 RCLK/End-of-Frame Timing (LXT901A PHY) .................................................................35
Mode 3 RCLK/Start-of-Frame Timing (LXT907A PHY) ................................................................35
Mode 3 RCLK/End-of-Frame Timing (LXT907A PHY) .................................................................36
Mode 3 Transmit Timing ...............................................................................................................36
Mode 3 Collision Detect Timing .....................................................................................................36
Mode 3 COL/CI Output Timing .....................................................................................................37
Mode 3 Loopback Timing .............................................................................................................37
Mode 4 RCLK/Start-of-Frame Timing ............................................................................................ 37
Mode 4 RCLK/End-of-Frame Timing ............................................................................................38
Mode 4 Transmit Timing ...............................................................................................................38
Mode 4 Collision Detect Timing ....................................................................................................39
Mode 4 COL/CI Output Timing .....................................................................................................39
Mode 4 Loopback Timing .............................................................................................................39
44-Pin PLCC..................................................................................................................................40
64-Pin LQFP .................................................................................................................................41
Cortina Systems
®
LXT901A and LXT907A PHY Transceivers
Page 1
LXT901A/907A PHY
Datasheet: Long Form
249098, Revision 4.0
03 December 2007
Tables
Tables
1
2
3
4
5
6
7
8
9
10
11
12
13
LXT901A/907A PHY Signal Descriptions ........................................................................................ 5
Controller Compatibility Modes........................................................................................................8
Suitable Crystals............................................................................................................................16
Absolute Maximum Values ............................................................................................................26
Recommended Operating Conditions ...........................................................................................26
I/O Electrical Characteristics .........................................................................................................26
AUI Electrical Characteristics ........................................................................................................27
TP Electrical Characteristics..........................................................................................................27
Switching Characteristics ..............................................................................................................28
RCLK/Start-of-Frame Timing .........................................................................................................28
RCLK/End-of-Frame Timing ..........................................................................................................28
Transmit Timing .............................................................................................................................29
Collision, COL/CI Output and Loopback Timing ............................................................................29
Cortina Systems
®
LXT901A and LXT907A PHY Transceivers
Page 1
