LXT971ABC datasheet(3/90 Pages) INTEL

3 / 90 page

LXT971A 3.3 V Dual-Speed Fast Ethernet Transceiver

Datasheet

Document #: 249414

Revision #: 002

Rev. Date: August 7, 2002

Contents

1.0

Pin Assignments ..............................................................................................................................12

2.0

Signal Descriptions ..........................................................................................................................16

3.0

Functional Description.....................................................................................................................21

3.1

Introduction .......................................................................................................................21

3.1.1

Comprehensive Functionality .............................................................................21

3.1.2

OSP™ Architecture ............................................................................................21

3.2

Network Media / Protocol Support....................................................................................22

3.2.1

10/100 Network Interface ...................................................................................22

3.2.1.1 Twisted-Pair Interface ..........................................................................22

3.2.1.2 Fiber Interface.......................................................................................22

3.2.1.3 Fault Detection and Reporting..............................................................23

3.2.2

MII Data Interface...............................................................................................23

3.2.2.1 Increased MII Drive Strength ...............................................................23

3.2.3

Configuration Management Interface .................................................................24

3.2.3.1 MDIO Management Interface ..............................................................24

3.2.3.2 Hardware Control Interface ..................................................................25

3.3

Operating Requirements....................................................................................................26

3.3.1

Power Requirements ...........................................................................................26

3.3.2

Clock Requirements............................................................................................26

3.3.2.1 External Crystal/Oscillator ...................................................................26

3.3.2.2 MDIO Clock .........................................................................................26

3.4

Initialization.......................................................................................................................26

3.4.1

MDIO Control Mode ..........................................................................................26

3.4.2

Hardware Control Mode .....................................................................................27

3.4.3

Reduced Power Modes........................................................................................28

3.4.3.1 Hardware Power Down ........................................................................28

3.4.3.2 Software Power Down..........................................................................29

3.4.3.3 Sleep Mode ...........................................................................................29

3.4.4

Reset....................................................................................................................29

3.4.5

Hardware Configuration Settings........................................................................30

3.5

Establishing Link...............................................................................................................31

3.5.1

Auto-Negotiation ................................................................................................31

3.5.1.1 Base Page Exchange.............................................................................31

3.5.1.2 Next Page Exchange.............................................................................31

3.5.1.3 Controlling Auto-Negotiation...............................................................31

3.5.2

Parallel Detection................................................................................................31

3.6

MII Operation....................................................................................................................32

3.6.1

MII Clocks ..........................................................................................................32

3.6.2

Transmit Enable ..................................................................................................33

3.6.3

Receive Data Valid .............................................................................................33

3.6.4

Carrier Sense .......................................................................................................33

3.6.5

Error Signals .......................................................................................................33

3.6.6

Collision ..............................................................................................................33

3.6.7

Loopback.............................................................................................................34

3.6.7.1 Operational Loopback ..........................................................................35

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