
Datasheet
Document #: 248987
Revision#: 003
Rev Date: 08/07/01
3
Advanced 10/100 Repeater with Integrated Management — LXT9860/9880
Contents
1.0
Other Related Documents
…
..........................................................................................11
2.0
Pin Assignments and Signal Descriptions
..................................................................12
3.0
Functional Description
..................................................................................................31
3.1
Introduction..........................................................................................................31
3.2
Port Configuration ...............................................................................................32
3.2.1
Auto-Negotiation.....................................................................................32
3.2.2
Forced Operation ...................................................................................33
3.2.3
Changing Port Speed - Forced...............................................................33
3.2.4
Link Establishment and Port Connection ...............................................33
3.2.5
MII Port Configuration ............................................................................33
3.3
Interface Descriptions..........................................................................................33
3.3.1
Twisted-Pair Interface ............................................................................33
3.3.2
Media Independent Interface..................................................................34
3.3.3
Serial Management Interface.................................................................34
3.3.4
Serial PROM Interface ...........................................................................35
3.4
Repeater Operation.............................................................................................35
3.4.1
100 Mbps Repeater Operation...............................................................35
3.4.2
10 Mbps Repeater Operation.................................................................36
3.5
Management Support..........................................................................................37
3.5.1
Configuration and Status........................................................................37
3.5.2
SNMP and RMON Support ....................................................................37
3.5.3
Source Address Management................................................................37
3.6
Requirements......................................................................................................37
3.6.1
Power.....................................................................................................37
3.6.2
Clock ......................................................................................................38
3.6.3
Bias Resistor..........................................................................................38
3.6.4
Reset......................................................................................................38
3.6.5
PROM.....................................................................................................38
3.6.6
Chip ID ...................................................................................................38
3.6.7
Management Master I/O Link.................................................................38
3.6.8
IRB Bus Pull-ups....................................................................................38
3.7
LED Operation.....................................................................................................39
3.7.1
LEDs at Start-up.....................................................................................39
3.7.2
LED Event Stretching.............................................................................39
3.7.3
LED Blink Rates.....................................................................................39
3.7.4
Serial LED Interface...............................................................................40
3.7.4.1 Serial Shifting............................................................................40
3.7.4.2 Serial LED Signals ....................................................................40
3.7.4.3 Activity Graph LEDs..................................................................41
3.7.5
Direct Drive LEDs...................................................................................42
3.7.6
LED Modes.............................................................................................42
3.7.6.1 LED Mode 1 ..............................................................................44
3.7.6.2 LED Mode 2 ..............................................................................45
3.7.6.3 LED Mode 3 ..............................................................................46
3.7.6.4 LED Mode 4 ..............................................................................47