Cortina Systems
®
LXT971A Single-Port
10/100 Mbps PHY Transceiver
Datasheet
The Cortina Systems
®
LXT971A Single-Port 10/100 Mbps PHY Transceiver (LXT971A PHY) directly
supports both 100BASE-TX and 10BASE-T applications. It provides a Media Independent Interface (MII)
for easy attachment to 10/100 Media Access Controllers (MACs). The LXT971A PHY is IEEE compliant,
and provides a Low Voltage Positive Emitter Coupled Logic (LVPECL) interface for use with 100BASE-
FX fiber networks. The LXT971A PHY supports full-duplex operation at 10 Mbps and 100 Mbps.
Operating conditions for the LXT971A PHY can be set using auto-negotiation, parallel detection, or
manual control. The LXT971A PHY is fabricated with an advanced CMOS process and requires only a
single 2.5/3.3 V power supply. (This Datasheet also supports the LXT971 PHY.)
Applications
Combination 10BASE-T/100BASE-TX or
100BASE-FX Network Interface Cards (NICs)
Network printers
10/100 Mbps PCMCIA cards
Cable Modems and Set-Top Boxes
Product Features
3.3 V Operation
Low power consumption (300 mW typical)
Low-power “Sleep” mode
10BASE-T and 100BASE-TX using a single RJ-
45 connection
IEEE 802.3-compliant 10BASE-T or 100BASE-
TX ports with integrated filters
Auto-negotiation and parallel detection
MII interface with extended register capability
Robust baseline wander correction
Carrier Sense Multiple Access / Collision
Detection (CSMA/CD) or full-duplex operation
JTAG boundary scan
MDIO serial port or hardware pin configurable
100BASE-FX fiber-optic capable
Integrated, programmable LED drivers
64-ball Plastic Ball Grid Array (PBGA) or 64-pin
Quad Flat Package (LQFP)
LXT971ABC - Commercial (0
°
to 70
°
C amb.)
LXT971ABE - Extended (-40
°
to 85
°
C amb.)
LXT971ALC - Commercial (0
°
to 70
°
C amb.)
LXT971ALE - Extended (-40
°
to 85
°
C amb.)
LXT972ALC - Commercial (0° to 70 °C amb.)
LXT971A PHY
Datasheet
249414, Revision 5.2
13 September 2007
Legal Disclaimers
This document contains information proprietary to Cortina Systems, Inc. (Cortina). Any use or disclosure, in whole or in part, of this
information to any unauthorized party, for any purposes other than that for which it is provided is expressly prohibited except as
authorized by Cortina in writing. Cortina reserves its rights to pursue both civil and criminal penalties for copying or disclosure of
this material without authorization.
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
®
and the Cortina Systems logo are the trademarks or registered trademarks of Cortina Systems, Inc. and its
subsidiaries in the U.S. and other countries. Other names and brands may be claimed as the property of others.
Copyright © 2007 Cortina Systems, Inc. All rights reserved.
Cortina Systems
®
LXT971A Single-Port 10/100 Mbps PHY Transceiver
Page 2
LXT971A PHY
Datasheet
249414, Revision 5.2
13 September 2007
Contents
Contents
1.0
Introduction to This Document .................................................................................................. 10
1.1
1.2
2.0
3.0
4.0
5.0
Document Overview ...........................................................................................................10
Related Documents ............................................................................................................ 10
Block Diagram ............................................................................................................................. 11
Ball and Pin Assignments .......................................................................................................... 12
Signal Descriptions ..................................................................................................................... 17
Functional Description................................................................................................................ 24
5.1
5.2
Device Overview ................................................................................................................. 24
5.1.1 Comprehensive Functionality ................................................................................ 24
5.1.2 Optimal Signal Processing Architecture.................................................................24
Network Media / Protocol Support ...................................................................................... 25
5.2.1 10/100 Network Interface....................................................................................... 25
5.2.2 MII Data Interface .................................................................................................. 27
5.2.3 Configuration Management Interface .................................................................... 27
Operating Requirements..................................................................................................... 29
5.3.1 Power Requirements ............................................................................................. 29
5.3.2 Clock Requirements ..............................................................................................30
Initialization ......................................................................................................................... 30
5.4.1 MDIO Control Mode and Hardware Control Mode................................................. 31
5.4.2 Reduced-Power Modes ......................................................................................... 32
5.4.3 Reset .....................................................................................................................33
5.4.4 Hardware Configuration Settings ........................................................................... 33
Establishing Link ................................................................................................................. 34
5.5.1 Auto-Negotiation .................................................................................................... 35
5.5.2 Parallel Detection................................................................................................... 36
MII Operation ...................................................................................................................... 36
5.6.1 MII Clocks .............................................................................................................. 37
5.6.2 Transmit Enable..................................................................................................... 39
5.6.3 Receive Data Valid ................................................................................................ 39
5.6.4 Carrier Sense......................................................................................................... 39
5.6.5 Error Signals .......................................................................................................... 40
5.6.6 Collision .................................................................................................................40
5.6.7 Loopback ............................................................................................................... 40
100 Mbps Operation ...........................................................................................................42
5.7.1 100BASE-X Network Operations ........................................................................... 42
5.7.2 Collision Indication ................................................................................................. 44
5.7.3 100BASE-X Protocol Sublayer Operations............................................................ 45
10 Mbps Operation ............................................................................................................. 49
5.8.1 10BASE-T Preamble Handling .............................................................................. 49
5.8.2 10BASE-T Carrier Sense....................................................................................... 49
5.8.3 10BASE-T Dribble Bits .......................................................................................... 49
5.8.4 10BASE-T Link Integrity Test ................................................................................ 50
5.8.5 Link Failure ............................................................................................................ 50
5.8.6 10BASE-T SQE (Heartbeat) .................................................................................. 50
5.8.7 10BASE-T Jabber .................................................................................................. 50
5.3
5.4
5.5
5.6
5.7
5.8
Cortina Systems
®
LXT971A Single-Port 10/100 Mbps PHY Transceiver
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LXT971A PHY
Datasheet
249414, Revision 5.2
13 September 2007
Contents
5.9
5.10
5.8.8 10BASE-T Polarity Correction ............................................................................... 50
Monitoring Operations ........................................................................................................ 50
5.9.1 Monitoring Auto-Negotiation .................................................................................. 50
5.9.2 Monitoring Next Page Exchange ........................................................................... 51
5.9.3 LED Functions ....................................................................................................... 51
5.9.4 LED Pulse Stretching............................................................................................. 52
Boundary Scan (JTAG 1149.1) Functions .......................................................................... 52
5.10.1 Boundary Scan Interface ....................................................................................... 52
5.10.2 State Machine ........................................................................................................ 52
5.10.3 Instruction Register ................................................................................................ 53
5.10.4 Boundary Scan Register ........................................................................................ 53
5.10.5 Device ID Register ................................................................................................. 53
Magnetics Information ........................................................................................................ 54
Typical Twisted-Pair Interface ............................................................................................ 54
Fiber Interface..................................................................................................................... 57
DC Electrical Parameters ................................................................................................... 61
AC Timing Diagrams and Parameters ................................................................................ 65
6.0
Application Information .............................................................................................................. 54
6.1
6.2
6.3
7.0
Electrical Specifications ............................................................................................................. 61
7.1
7.2
8.0
9.0
Register Definitions - IEEE Base Registers .............................................................................. 78
Register Definitions - Product-Specific Registers ................................................................... 86
10.0 Package Specifications............................................................................................................... 94
Cortina Systems
®
LXT971A Single-Port 10/100 Mbps PHY Transceiver
Page 4
LXT971A PHY
Datasheet
249414, Revision 5.2
13 September 2007
Figures
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
44
45
Block Diagram ............................................................................................................................... 11
64-Ball PBGA: Ball Assignments .................................................................................................. 13
64-Pin LQFP Package: Pins Assignments ................................................................................... 14
Management Interface Read Frame Structure ............................................................................. 28
Management Interface Write Frame Structure ............................................................................. 28
MII Interrupt Logic ......................................................................................................................... 29
Initialization Sequence .................................................................................................................. 31
Hardware Configuration Settings .................................................................................................. 34
Link Establishment Overview ...................................................................................................... 35
Clocking for 10BASE-T ................................................................................................................. 38
Clocking for 100BASE-X .............................................................................................................. 38
Clocking for Link Down Clock Transition ...................................................................................... 39
Loopback Paths ............................................................................................................................ 41
100BASE-X Frame Format ...........................................................................................................42
100BASE-TX Data Path ............................................................................................................... 43
100BASE-TX Reception with No Errors ....................................................................................... 43
100BASE-TX Reception with Invalid Symbol ............................................................................... 44
100BASE-TX Transmission with No Errors .................................................................................. 44
100BASE-TX Transmission with Collision .................................................................................... 44
Protocol Sublayers ....................................................................................................................... 45
LED Pulse Stretching ................................................................................................................... 52
Typical Twisted-Pair Interface - Switch ......................................................................................... 55
Typical Twisted-Pair Interface - NIC ..............................................................................................56
Typical Media Independent Interface ............................................................................................ 57
Typical Interface - LXT971A PHY to 3.3 V Fiber PHY................................................................... 58
Typical Interface LXT971A PHY to 5 V Fiber PHY........................................................................ 59
Typical Interface - LXT971A PHY to Triple PECL-to-PECL Logic Translator............................... 60
100BASE-TX Receive Timing - 4B Mode ...................................................................................... 66
100BASE-TX Transmit Timing - 4B Mode ..................................................................................... 67
100BASE-FX Receive Timing ....................................................................................................... 68
100BASE-FX Transmit Timing ...................................................................................................... 69
10BASE-T Receive Timing ...........................................................................................................70
10BASE-T Receive Timing ............................................................................................................ 70
10BASE-T Transmit Timing .......................................................................................................... 72
10BASE-T Jabber and Unjabber Timing ...................................................................................... 73
10BASE-T SQE (Heartbeat) Timing ............................................................................................. 73
Auto-Negotiation and Fast Link Pulse Timing ............................................................................... 74
Fast Link Pulse Timing .................................................................................................................. 74
MDIO Input Timing ........................................................................................................................ 75
MDIO Output Timing...................................................................................................................... 75
Power-Up Timing ........................................................................................................................... 76
RESET_L Pulse Width and Recovery Timing ............................................................................... 76
PHY Identifier Bit Mapping ...........................................................................................................81
PBGA Package Specification ........................................................................................................ 94
LQFP Package Specifications ....................................................................................................... 95
Cortina Systems
®
LXT971A Single-Port 10/100 Mbps PHY Transceiver
Page 5
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