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XT971A Datasheet PDF : 90 Pages
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LXT971A 3.3 V Dual-Speed Fast Ethernet Transceiver
3.6.7.2 Test Loopback...................................................................................... 35
3.7 100 Mbps Operation ......................................................................................................... 36
3.7.1 100BASE-X Network Operations...................................................................... 36
3.7.2 Collision Indication ............................................................................................ 38
3.7.3 100BASE-X Protocol Sublayer Operations ....................................................... 38
3.7.3.1 PCS Sublayer ....................................................................................... 38
3.7.3.2 PMA Sublayer...................................................................................... 41
3.7.3.3 Twisted-Pair PMD Sublayer ................................................................ 42
3.7.3.4 Fiber PMD Sublayer ............................................................................ 43
3.8 10 Mbps Operation ........................................................................................................... 43
3.8.1 10BASE-T Preamble Handling.......................................................................... 43
3.8.2 10BASE-T Carrier Sense ................................................................................... 43
3.8.3 10BASE-T Dribble Bits ..................................................................................... 43
3.8.4 10BASE-T Link Integrity Test........................................................................... 44
3.8.4.1 Link Failure.......................................................................................... 44
3.8.5 10BASE-T SQE (Heartbeat) .............................................................................. 44
3.8.6 10BASE-T Jabber .............................................................................................. 44
3.8.7 10BASE-T Polarity Correction .......................................................................... 44
3.9 Monitoring Operations ..................................................................................................... 44
3.9.1 Monitoring Auto-Negotiation ............................................................................ 44
3.9.1.1 Monitoring Next Page Exchange......................................................... 45
3.9.2 LED Functions ................................................................................................... 45
3.9.2.1 LED Pulse Stretching........................................................................... 45
3.10 Boundary Scan (JTAG1149.1) Functions ........................................................................ 46
3.10.1 Boundary Scan Interface .................................................................................... 46
3.10.2 State Machine..................................................................................................... 46
3.10.3 Instruction Register ............................................................................................ 46
3.10.4 Boundary Scan Register (BSR).......................................................................... 46
4.0
Application Information.................................................................................................................. 48
4.1 Magnetics Information ..................................................................................................... 48
4.2 Typical Twisted-Pair Interface ......................................................................................... 48
4.3 The Fiber Interface ........................................................................................................... 52
5.0
Test Specifications .......................................................................................................................... 56
5.1 Electrical Parameters ........................................................................................................ 56
5.2 Timing Diagrams .............................................................................................................. 61
6.0
Register Definitions ........................................................................................................................ 71
7.0
Package Specifications.................................................................................................................... 88
8.0
Product Ordering Information......................................................................................................... 90
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Datasheet
Document #: 249414
Revision #: 002
Rev. Date: August 7, 2002
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