LXT914 —
Flexible Quad Ethernet Repeater
4
Datasheet
Figures
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LXT914 Block Diagram .........................................................................................7
LXT914 Pin Assignments......................................................................................8
Global State Machine..........................................................................................18
Partitioning State Machine ..................................................................................19
Integrated LED Driver Indications.......................................................................27
12-Port Application Schematic, 68-Pin PLCC Package......................................30
8-Port Application Schematic, LED Mode 1 with AUISEL = MAU.......................34
Serial Port Timing................................................................................................39
Inter-Repeater Bus Timing..................................................................................40
LXT914PC/PE Package Specifications...............................................................41
LXT914QC Package Specifications....................................................................42
Tables
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LXT914 Power, Ground and Clock Signal Descriptions........................................9
LXT914 Inter-Repeater Backplane Signal Descriptions......................................10
LXT914 Mode Select and Control Signal Descriptions .......................................10
LXT914 Serial Port Signal Descriptions (External Management Mode) .............11
LXT914 Serial Port Signal Descriptions (Local Management Mode)..................11
LXT914 Miscellaneous Control Signal Descriptions ...........................................12
LXT914 LED Driver Signal Descriptions.............................................................12
LXT914 Repeater Port Signal Descriptions ........................................................13
Setup Register Bit Assignments..........................................................................20
Setup Register Bit Definitions .............................................................................20
Packet Status Register Bit Assignments.............................................................21
Packet Status Register Bit Definitions.................................................................21
AUI Mode Selection (DTE/MAU).........................................................................23
LED Mode Selection ...........................................................................................25
Mode 0 (Default) LED Truth Table......................................................................25
Mode 1 LED Truth Table.....................................................................................26
Mode 2 LED Truth Table.....................................................................................26
Mode 3 LED Truth Table.....................................................................................26
Manufacturers Magnetics List .............................................................................29
Absolute Maximum Ratings ................................................................................36
Recommended Operating Conditions.................................................................36
I/O Electrical Characteristics
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(over recommended range).................................36
AUI Electrical Characteristics (over recommended range) .................................37
Twisted-Pair Electrical Characteristics (over recommended range) ...................37
IRB Electrical Characteristics (over recommended range) .................................38
Switching Characteristics (over recommended range) .......................................38
Serial Port Timing
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External Mode (over recommended range) ........................38
Inter-Repeater Bus Timing (over recommended range) .....................................39