LXT971A 3.3 V Dual-Speed Fast Ethernet Transceiver
Figures
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LXT971A Block Diagram...................................................................................................9
64-Pin PBGA Pin Assignments.........................................................................................10
64-Pin LQFP Pin Assignments..........................................................................................11
Management Interface Read Frame Structure...................................................................21
Management Interface Write Frame Structure..................................................................21
Interrupt Logic...................................................................................................................22
Initialization Sequence ......................................................................................................24
Hardware Configuration Settings......................................................................................26
Link Establishment Overview...........................................................................................28
10BASE-T Clocking .........................................................................................................30
100BASE-X Clocking.......................................................................................................30
Link Down Clock Transition.............................................................................................30
Loopback Paths .................................................................................................................31
100BASE-X Frame Format...............................................................................................32
100BASE-TX Data Path....................................................................................................33
100BASE-TX Reception with no Errors...........................................................................33
100BASE-TX Reception with Invalid Symbol.................................................................33
100BASE-TX Transmission with no Errors......................................................................34
100BASE-TX Transmission with Collision......................................................................34
Protocol Sublayers.............................................................................................................35
LED Pulse Stretching ........................................................................................................42
Typical Twisted-Pair Interface - Switch............................................................................45
Typical Twisted-Pair Interface - NIC................................................................................46
Typical MII Interface ........................................................................................................47
Typical Fiber Interface ......................................................................................................48
100BASE-TX Receive Timing - 4B Mode .......................................................................53
100BASE-TX Transmit Timing - 4B Mode......................................................................54
100BASE-FX Receive Timing..........................................................................................55
100BASE-FX Transmit Timing ........................................................................................56
10BASE-T Receive Timing ..............................................................................................57
10BASE-T Transmit Timing.............................................................................................58
10BASE-T Jabber and Unjabber Timing ..........................................................................59
10BASE-T SQE (Heartbeat) Timing.................................................................................59
Auto Negotiation and Fast Link Pulse Timing..................................................................60
Fast Link Pulse Timing .....................................................................................................60
MDIO Input Timing ..........................................................................................................61
MDIO Output Timing........................................................................................................61
Power-Up Timing..............................................................................................................62
RESET Pulse Width and Recovery Timing ......................................................................62
PHY Identifier Bit Mapping..............................................................................................68
PBGA Package Specification............................................................................................79
LXT971A LQFP Package Specifications..........................................................................80
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Datasheet
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Document #: 249414
Revision #: 002
Rev. Date: August 7, 2002
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