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LTX9863 Datasheet Preview

LTX9863 Datasheet

(LTX9883 / LTX9863) Advanced 10/100 Unmanaged Repeater

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Data Sheet - Preliminary Information
LXT9883/LXT9863
MAY 2000
Revision 1.0
Advanced 10/100 Unmanaged Repeater
General Description
The LXT9883 is an advanced, 3.3V, 8-port 10/100
repeater. The LXT9883 is compatible with previous
generations of Level One repeaters from the LXT980 and
LXT918 families. Eight ports directly support 100BASE-
TX/10BASE-T copper media. Two additional Media
Independent Interface (MII) ports (10/100 Mbps
selectable) connect to Media Access Controllers (MACs)
for bridge/switch applications. The LXT9863 offers the
same features and functionality in a six-port device. This
data sheet uses the singular designation “LXT98x3” to
refer to both devices.
The LXT98x3 provides auto-negotiation with parallel
detection for the PHY ports. The LXT98x3 provides two
internal repeater state machines—one operating at
10 Mbps and one at 100 Mbps. Once configured, the
LXT98x3 automatically connects each port to the
appropriate repeater. The LXT98x3 also provides two
Inter-Repeater Backplanes (IRBs) for expansion — one
operating at 10 Mbps and one at 100 Mbps. Up to 240
twisted-pair and MII ports can logically be combined into
one repeater.
Features
• Six or eight 10/100 ports with integrated twisted-pair
PHYs including integrated filters.
• Two 10/100 MIIs for bridging.
• Independent segments for 10 and 100 Mbps
operation.
• Cascadable Inter-Repeater Backplanes (IRBs), with
option for 5V stacking compatibility.
• Integrated LED drivers with user-selectable modes.
• Available in 208-pin QFP package.
• Operating temperature range: 0-70°C, ambient.
LXT98x3 Block Diagram
10M IRB
10 Mbps
Backplane
10BASE-T
Repeater
100M IRB
100 Mbps
Backplane
100BASE-X
Repeater
Port & Mgmt
Status Indicators
Serial LED
Drivers
Refer to www.level1.com for most current information.
10/100 PHY 1
10/100 PHY 2
10/100 PHY 3
10/100 PHY 4
10/100 PHY 5
10/100 PHY 6
10/100 PHY 7
10/100 PHY 8
MII 1
MII 2
TX_I/O
TX_I/O
TX_I/O
TX_I/O
TX_I/O
TX_I/O
TX_I/O
TX_I/O
MII_I/O
MII_I/O
)




Level One Communications

LTX9863 Datasheet Preview

LTX9863 Datasheet

(LTX9883 / LTX9863) Advanced 10/100 Unmanaged Repeater

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www.DLaXtaTSh9e8e8t43U/.LcoXmT9863 Advanced 10/100 Unmanaged Repeater
TABLE OF CONTENTS
Pin Assignments and Signal Descriptions .......... 3
Pin Assignments ................................................. 3
MII #1 Signal Descriptions .................................. 4
MII #2 Signal Descriptions .................................. 5
IRB Signal Descriptions ...................................... 6
Twisted-Pair Port Signal Descriptions............... 10
LED Signal Descriptions ................................... 11
Power Supply Signal Descriptions .................... 12
Miscellaneous Signal Descriptions ................... 14
Functional Description ........................................ 15
Introduction ....................................................... 15
Port Configuration............................................. 16
Auto-Negotiation ............................................... 16
Link Establishment and Port Connection .......... 16
MII Port Configuration ....................................... 16
Interface Descriptions....................................... 16
Twisted-Pair Interface ....................................... 16
Media Independent Interface (MII).................... 17
Repeater Operation ........................................... 18
100 Mbps Repeater Operation.......................... 18
10 Mbps Repeater Operation............................ 18
Requirements .................................................... 19
Power................................................................ 19
Clock ................................................................. 19
Bias Current ...................................................... 35
Reset ................................................................ 19
IRB Bus Pull-Ups .............................................. 19
LED Operation ................................................... 20
LEDs at Start-Up............................................... 20
Serial LEDs ....................................................... 20
LED Event Stretching ....................................... 20
Serial LED Interface.......................................... 20
Serial Shifting............................................... 20
Serial LED Signals....................................... 21
Activity Graph LEDs .....................................22
Direct Drive LEDs..............................................23
LED Modes .......................................................23
LED Mode 1 .................................................23
LED Mode 2 .................................................25
LED Mode 3 .................................................26
LED Mode 4 .................................................27
IRB Operation.....................................................28
MAC IRB Access.............................................. 28
LXT980 Device Compatibility ............................28
MII Port Operation..............................................31
Application Information .......................................32
General Design Guidelines ...............................32
Power and Ground ............................................32
Supply Filtering ............................................32
The RBIAS Pin.............................................34
MII Terminations................................................34
Twisted-Pair Interface .......................................35
Magnetics Information..................................35
LED Circuits ......................................................37
Direct Drive LEDs ........................................37
LEDs Multiplexed with Configuration Inputs 37
Serial Port LEDs ..........................................38
Inter-Repeater Backplane Compatibility..........39
Local Backplane - 3.3V Only.............................39
Stack Backplane - 3.3V or 5.0V ........................39
Test Specifications ...............................................42
Mechanical Specifications...................................55
2


Part Number LTX9863
Description (LTX9883 / LTX9863) Advanced 10/100 Unmanaged Repeater
Maker Level One Communications
Total Page 30 Pages
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