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LXT974B Datasheet(PDF) 3 Page - Intel Corporation |
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LXT974B Datasheet(HTML) 3 Page - Intel Corporation |
3 / 74 page Datasheet 3 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 |
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