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LXT972A Datasheet PDF : 70 Pages
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3.3V Dual-Speed Fast Ethernet Transceiver Datasheet — LXT972A
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LXT972A Block Diagram ....................................................................................... 9
LXT972A 64-Pin LQFP Assignments ..................................................................10
Management Interface Read Frame Structure ...................................................19
Management Interface Write Frame Structure ...................................................19
Interrupt Logic ....................................................................................................20
Initialization Sequence .......................................................................................22
Hardware Configuration Settings .......................................................................23
Link Establishment Overview .............................................................................25
10BASE-T Clocking ............................................................................................27
100BASE-X Clocking .........................................................................................27
Link Down Clock Transition ................................................................................27
Loopback Paths ..................................................................................................28
100BASE-X Frame Format ................................................................................29
100BASE-TX Data Path .....................................................................................29
100BASE-TX Reception with no Errors ..............................................................30
100BASE-TX Reception with Invalid Symbol .....................................................30
100BASE-TX Transmission with no Errors .......................................................31
100BASE-TX Transmission with Collision .........................................................31
Protocol Sublayers .............................................................................................32
LED Pulse Stretching .........................................................................................38
Typical Twisted-Pair Interface - Switch ...............................................................41
Typical Twisted-Pair Interface - NIC ...................................................................42
Typical MII Interface ...........................................................................................43
100BASE-TX Receive Timing - 4B Mode ...........................................................47
100BASE-TX Transmit Timing - 4B Mode ..........................................................48
10BASE-T Receive Timing .................................................................................49
10BASE-T Transmit Timing ................................................................................50
10BASE-T Jabber and Unjabber Timing ............................................................51
10BASE-T SQE (Heartbeat) Timing ...................................................................51
Auto Negotiation and Fast Link Pulse Timing ....................................................52
Fast Link Pulse Timing .......................................................................................52
MDIO Input Timing .............................................................................................53
MDIO Output Timing ..........................................................................................53
Power-Up Timing ................................................................................................54
RESET Pulse Width and Recovery Timing ........................................................54
PHY Identifier Bit Mapping .................................................................................60
LXT972A LQFP Package Specifications ............................................................70
Tables
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LQFP Numeric Pin List.......................................................................................11
LXT972A MII Signal Descriptions........................................................................13
LXT972A Network Interface Signal Descriptions ................................................14
LXT972A Miscellaneous Signal Descriptions......................................................14
LXT972A Power Supply Signal Descriptions ......................................................15
LXT972A JTAG Test Signal Descriptions ...........................................................15
LXT972A LED Signal Descriptions......................................................................15
Hardware Configuration Settings ........................................................................24
Datasheet
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