Intel
®
LXT972M Single-Port 10/100 Mbps
PHY Transceiver
Datasheet
The Intel
®
LXT972M Single-Port 10/100 Mbps PHY Transceiver is an IEEE compliant Fast
Ethernet PHY Transceiver that 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). Both full and half-duplex operation at 10 Mbps and 100 Mbps is supported.
Operation mode can be set to auto-negotiation, parallel detection, or manual control. The device is
powered from a single 3.3V power supply.
Applications
■
■
■
Combination 10BASE-T/100BASE-TX
Network Interface Cards (NICs)
Wireless access points
Network printers
■
■
10/100 Personal Computer Memory Card
International Association (PCMCIA) cards
Cable Modems and Set-Top Boxes
Product Features
■
■
■
■
■
3.3V Operation
IEEE 802.3-compliant 10BASE-T or
100BASE-TX 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
Integrated, programmable LED drivers
48-pin Low-profile Quad Flat Package
RESET_L
ADDR[1:0]
MDIO
MDC
Management /
Mode Select
Logic
Power Supply
Register Set
Clock
Generator
VCC
GND
REFCLK/XI
XO
TX_EN
TXD[3:0]
TX PCS
Manchester
10
Encoder
Parallel/Serial
Converter
Scrambler
100
& Encoder
Auto
Negotiation
Register
Set
OSP
Pulse
Shaper
+
TP
Driver
TP Out
TPOP
TPON
-
TX_CLK
LED/CFG[3:1]
JTAG
5
COL
Collision
Detect
Clock
Generator
Media
Select
OSP
Adaptive EQ with
Baseline Wander
Cancellation
100TX
TDI
TDO
TMS
TCK
TRST_L
+
-
TP In
TPIP
TPIN
RX_CLK
RXD[3:0]
RX P CS
RX_DV
CRS
RX_ER
Serial-to-
Parallel
Carrier Sense Converter
Data Valid
Error Detect
10
100
Manchester
Decoder
Decoder &
Descrambler
OSP
Slicer
10BT
+
-
B3387-13
Document Number: 302875-004
Revision Date: February 18, 2005
Intel
®
LXT972M Single-Port 10/100 Mbps PHY Transceiver
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, life sustaining, critical control or safety systems, or
in nuclear facility 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 Intel
®
LXT972M Single-Port 10/100 Mbps PHY Transceiver 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.
Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States and other countries.
*Other names and brands may be claimed as the property of others.
Copyright © 2005, Intel Corporation.
2
Datasheet
Document Number: 302875-004
Revision Date: February 18, 2005
Intel
®
LXT972M Single-Port 10/100 Mbps PHY Transceiver
Contents
1.0
Introduction to This Document ......................................................................................... 11
1.1
1.2
2.0
3.0
4.0
5.0
Document Overview ............................................................................................11
Related Documents............................................................................................. 11
Block Diagram for Intel
®
LXT972M Transceiver............................................................... 12
Pin Assignments for Intel
®
LXT972M Transceiver ...........................................................13
Signal Descriptions for Intel
®
LXT972M Transceiver ....................................................... 17
Functional Description...................................................................................................... 23
5.1
Introduction.......................................................................................................... 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 ..................................................... 28
Operating Requirements .....................................................................................30
5.3.1 Power Requirements ..............................................................................30
5.3.2 Clock Requirements ............................................................................... 30
Initialization.......................................................................................................... 31
5.4.1 MDIO Control Mode and Hardware Control Mode .................................33
5.4.2 Reduced-Power Modes .......................................................................... 34
5.4.3 Reset for Intel
®
LXT972M Transceiver................................................... 34
5.4.4 Hardware Configuration Settings ...........................................................35
Establishing Link .................................................................................................36
5.5.1 Auto-Negotiation.....................................................................................36
5.5.2 Parallel Detection ................................................................................... 37
MII Operation....................................................................................................... 38
5.6.1 MII Clocks............................................................................................... 39
5.6.2 Transmit Enable .....................................................................................40
5.6.3 Receive Data Valid ................................................................................. 40
5.6.4 Carrier Sense ......................................................................................... 41
5.6.5 Error Signals........................................................................................... 41
5.6.6 Collision .................................................................................................. 41
5.6.7 Loopback................................................................................................ 42
100 Mbps Operation ............................................................................................43
5.7.1 100BASE-X Network Operations ...........................................................43
5.7.2 Collision Indication ................................................................................. 46
5.7.3 100BASE-X Protocol Sublayer Operations ............................................ 47
10 Mbps Operation.............................................................................................. 52
5.8.1 10BASE-T Preamble Handling ............................................................... 52
5.8.2 10BASE-T Carrier Sense .......................................................................52
5.8.3 10BASE-T Dribble Bits ........................................................................... 52
5.8.4 10BASE-T Link Integrity Test ................................................................. 53
5.8.5 Link Failure ............................................................................................. 53
5.2
5.3
5.4
5.5
5.6
5.7
5.8
Datasheet
Document Number: 302875-004
Revision Date: February 18, 2005
3
Intel
®
LXT972M Single-Port 10/100 Mbps PHY Transceiver
5.9
5.10
5.8.6 10BASE-T SQE (Heartbeat) .................................................................. 53
5.8.7 10BASE-T Jabber .................................................................................. 53
5.8.8 10BASE-T Polarity Correction................................................................ 53
Monitoring Operations ......................................................................................... 54
5.9.1 Monitoring Auto-Negotiation................................................................... 54
5.9.2 Monitoring Next Page Exchange............................................................ 54
5.9.3 LED Functions........................................................................................ 55
5.9.4 LED Pulse Stretching ............................................................................. 56
Boundary Scan (JTAG 1149.1) Functions .......................................................... 57
5.10.1 Boundary Scan Interface........................................................................ 57
5.10.2 State Machine ........................................................................................ 57
5.10.3 Instruction Register ................................................................................ 57
5.10.4 Boundary Scan Register ........................................................................ 58
5.10.5 Device ID Register ................................................................................. 58
6.0
Application Information..................................................................................................... 59
6.1
6.2
Magnetics Information ......................................................................................... 59
Typical Twisted-Pair Interface ............................................................................. 59
7.0
Electrical Specifications ................................................................................................... 63
7.1
7.2
Electrical Parameters .......................................................................................... 63
Timing Diagrams ................................................................................................. 67
8.0
9.0
10.0
11.0
Register Definitions - IEEE Base Registers ..................................................................... 77
Register Definitions - Product-Specific Registers ............................................................ 85
Intel
®
LXT972M Transceiver Package Specifications...................................................... 92
Product Ordering Information ........................................................................................... 93
4
Datasheet
Document Number: 302875-004
Revision Date: February 18, 2005
Intel
®
LXT972M Single-Port 10/100 Mbps PHY Transceiver
Figures
1
2
3
4
5
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7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
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23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
Intel
®
LXT972M Transceiver Block Diagram ...................................................... 12
Pin Assignments for Intel
®
LXT972M Transceiver 48-Pin LQFP Package ......... 13
Pin Assignments for Intel
®
LXT972M Transceiver Pb-Free 48-Pin LQFP ......... 14
Management Interface Read Frame Structure ................................................... 29
Management Interface Write Frame Structure ................................................... 29
Initialization Sequence for Intel
®
LXT972M Transceiver .................................... 32
Link Establishment Overview) ............................................................................. 36
Clocking for 10BASE-T ...................................................................................... 39
Clocking for 100BASE-X .................................................................................... 39
Clocking for Link Down Clock Transition ............................................................ 40
Intel
®
LXT972M Transceiver Loopback Paths ....................................................42
100BASE-X Frame Format ................................................................................ 43
100BASE-TX Data Path .....................................................................................44
100BASE-TX Reception with No Errors ............................................................. 45
100BASE-TX Reception with Invalid Symbol ..................................................... 45
100BASE-TX Transmission with No Errors ........................................................ 46
100BASE-TX Transmission with Collision .......................................................... 46
Intel
®
LXT972M Protocol Sublayers ................................................................... 47
LED Pulse Stretching ......................................................................................... 56
Intel
®
LXT972M Transceiver Typical Twisted-Pair Interface - Switch ................. 60
Intel
®
LXT972M Transceiver Typical Twisted-Pair Interface - NIC .....................61
Intel
®
LXT972M Transceiver Typical Media Independent Interface .................... 62
Intel
®
LXT972M Transceiver 100BASE-TX Receive Timing ............................... 67
Intel
®
LXT972M Transceiver 100BASE-TX Transmit Timing .............................. 68
Intel
®
LXT972M Transceiver 10BASE-T Receive Timing .................................. 69
Intel
®
LXT972M Transceiver 10BASE-T Transmit Timing .................................. 70
Intel
®
LXT972M Transceiver 10BASE-T Jabber and Unjabber Timing ..............71
Intel
®
LXT972M Transceiver 10BASE-T SQE (Heartbeat) Timing .....................72
Intel
®
LXT972M Transceiver Auto-Negotiation and Fast Link Pulse Timing .......73
Intel
®
LXT972M Transceiver Fast Link Pulse Timing .......................................... 73
Intel
®
LXT972M Transceiver MDIO Input Timing ................................................ 74
Intel
®
LXT972M Transceiver MDIO Output Timing .............................................74
Intel
®
LXT972M Transceiver Power-Up Timing .................................................. 75
Intel
®
LXT972M Transceiver RESET_L Pulse Width and Recovery Timing .......76
PHY Identifier Bit Mapping ................................................................................. 80
Intel
®
LXT972M Transceiver LQFP Package Specifications .............................. 92
Order Matrix for Intel
®
LXT972M Transceiver ing Information - Sample ............ 93
Datasheet
Document Number: 302875-004
Revision Date: February 18, 2005
5
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