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LXT974A

Fast Ethernet 10/100 Quad Transceivers

Intel 

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

Datasheet

3

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