LXT975B datasheet(3/74 Pages) INTEL

3 / 74 page

Datasheet

Fast Ethernet 10/100 Quad Transceivers — LXT974/LXT975

Contents

1.0

Pin Assignments and Signal Descriptions....................................................10

2.0

Functional Description...........................................................................................19

2.1

Introduction.......................................................................................................... 19

2.2

Network Media / Protocol Support....................................................................... 20

2.2.1

10/100 Mbps Network Interface ............................................................. 20

2.2.1.1 Twisted-Pair Interface ...............................................................20

2.2.1.2 Fiber Interface ........................................................................... 21

2.2.2

MII Interface ........................................................................................... 21

2.2.2.1 MII Data Interface ...................................................................... 21

2.2.2.2 MII Management Interface ........................................................ 24

2.2.3

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

2.3

Initialization.......................................................................................................... 27

2.3.1

MDIO Control Mode ............................................................................... 27

2.3.2

Manual Control Mode ............................................................................. 27

2.3.3

Link Configuration ..................................................................................28

2.4

Auto-Negotiation.................................................................................................. 29

2.4.1

Parallel Detection ................................................................................... 29

2.4.2

Controlling Auto-Negotiation .................................................................. 29

2.4.3

Monitoring Auto-Negotiation ................................................................... 29

2.5

100 Mbps Operation............................................................................................ 30

2.5.1

100BASE-X MII Operations.................................................................... 30

2.5.2

100BASE-X Network Operations ........................................................... 30

2.5.3

100BASE-X Protocol Sublayer Operations ............................................33

2.5.4

PCS Sublayer .........................................................................................33

2.5.4.1 Preamble Handling .................................................................... 33

2.5.4.2 Data Errors ................................................................................ 34

2.5.4.3 Collision Indication .................................................................... 34

2.5.5

PMA Sublayer ........................................................................................ 35

2.5.5.1 Link ............................................................................................ 35

2.5.5.2 Link Failure Override ................................................................. 35

2.5.5.3 Carrier Sense (CRS) ................................................................. 35

2.5.6

Twisted-Pair PMD Sublayer ................................................................... 35

2.5.6.1 Scrambler/Descrambler (100TX Only) ...................................... 35

2.5.6.2 Baseline Wander Correction ..................................................... 36

2.5.6.3 Polarity Correction .....................................................................36

2.5.7

Fiber PMD Sublayer ............................................................................... 36

2.6

10 Mbps Operation.............................................................................................. 36

2.6.1

10BASE-T MII Operation........................................................................ 36

2.6.2

10BASE-T Network Operations.............................................................. 36

2.6.2.1 Preamble Handling .................................................................... 37

2.6.2.2 Link Test .................................................................................... 37

2.6.2.3 Link Failure ................................................................................ 37

2.6.2.4 SQE (Heartbeat)........................................................................ 37

2.6.2.5 Jabber ....................................................................................... 37

2.7

LED Functions..................................................................................................... 37

2.7.1

Serial LED Output ..................................................................................38

LXT975B Datasheet(PDF) 3 Page - Intel Corporation

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