LXT980/980A Dual-Speed, 5-Port Fast Ethernet Repeater
6
Datasheet
Tables
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Mode Control Signal Descriptions.......................................................................11
PHY Mode MII Interface Signal Descriptions......................................................11
MAC Mode MII Interface Signal Descriptions .....................................................12
Inter-Repeater Backplane Signal Descriptions ...................................................13
Twisted-Pair Port Signal Descriptions.................................................................15
Fiber Port Signal Descriptions.............................................................................15
Serial Management Interface Signal Descriptions ..............................................15
LED Signal Descriptions .....................................................................................16
Power Supply and Indication Signal Descriptions...............................................17
PROM Interface Signal Descriptions...................................................................18
Miscellaneous Signal Descriptions......................................................................18
Manual Speed Selection .....................................................................................24
LED Mode 1 Indications......................................................................................34
LED Mode 2 Indications......................................................................................34
LED Mode 3 Indications......................................................................................35
IRB Signal Types ................................................................................................36
IRB Signal Details...............................................................................................37
MII (Port 5) Mode & Speed Control.....................................................................38
Serial Management Interface Message Fields....................................................42
Serial Management Header Storage...................................................................43
Serial Management Interface Command Set......................................................43
Typical Serial Management Packets...................................................................44
Magnetics Specifications.....................................................................................51
Absolute Maximum Ratings ................................................................................59
Operating Conditions ..........................................................................................59
Input Clock Requirements...................................................................................59
I/O Electrical Characteristics...............................................................................60
100 Mbps IRB Electrical Characteristics.............................................................60
10 Mbps IRB Electrical Characteristics...............................................................61
100BASE-TX Transceiver Electrical Characteristics..........................................61
100BASE-FX Transceiver Electrical Characteristics..........................................61
10BASE-T Transceiver Electrical Characteristics..............................................62
100 Mbps Port-to-Port Delay Timing Parameters ...............................................63
100BASE-TX Transmit Timing Parameters - PHY Mode MII..............................64
100BASE-TX Receive Timing Parameters - PHY Mode MII...............................65
100BASE-TX Transmit Timing Parameters - MAC Mode MII .............................66
100BASE-TX Receive Timing - MAC Mode MII..................................................67
100BASE-FX Transmit Timing Parameters - PHY Mode MII..............................68
100BASE-FX Receive Timing - PHY Mode MII ..................................................69
100BASE-FX Transmit Timing - MAC Mode MII.................................................70
100BASE-FX Receive Timing - MAC Mode MII..................................................71
10BASE-T Transmit Timing Parameters - PHY Mode MII ..................................72
10BASE-T Receive Timing Parameters - PHY Mode MII ...................................73
100 Mbps IRB Timing Parameters1....................................................................74
10 Mbps IRB Receive Timing Parameters1........................................................75
10 Mbps IRB Transmit Timing Parameters.........................................................76
Serial Interface Timing Characteristics 1 ............................................................77
PROM Interface Timing Characteristics..............................................................78
Register Set ........................................................................................................79