LXT9860/9880
Advanced 10/100 Repeater with Integrated Management
Datasheet
The LXT9880 is the next-generation repeater family, integrated with eight 10/100 transceivers.
The LXT9880 is compatible with previous generations of Intel 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 LXT9860 offers the same
features and functionality in a six-port device. This data sheet uses the singular designation
“LXT98x0” to refer to both devices.
The LXT98x0 provides auto-negotiation with parallel detection for the PHY ports. The
LXT98x0 provides two internal repeater state machines—one operating at 10 Mbps and one at
100 Mbps. Once configured, the LXT98x0 automatically connects each port to the appropriate
repeater. The LXT98x0 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. The LXT98x0 supports SNMP and RMON
management via on-chip 32- and 64-bit counters. The counters and control functions are
accessible via a high-speed Serial Management Interface (SMI).
Product Features
s
s
s
s
s
Six or eight 10/100 ports with integrated
twisted-pair PHYs including integrated
filters.
Two 10/100 MIIs for bridging.
Independent segments for 10 Mbps and
100 Mbps operation.
Cascadable Inter-Repeater Backplanes
(IRBs), with option for 5V stacking
compatibility.
Hardware assist for RMON and the
Repeater MIB.
s
s
s
s
s
s
s
High-speed Serial Management Interface
(SMI).
Two address-tracking registers per port.
Source Address matching function.
Integrated LED drivers with user-selectable
modes.
Available in 208-pin QFP package.
Operating temperature range: 0-70
°
C,
ambient.
Available in extended temperature range:
-40 to +85
°
C, ambient.
For More Information…
Refer to “Section
1.0, “Other Related Documents…” on page 11”
.
As of January 15, 2001, this document replaces the Level One document
known as
Advanced 10/100 Repeater with Integrated Management.
Order Number: 248987-003
August 2001
Information in this document is provided in connection with Intel
®
products. No license, express or implied, by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Intel’s Terms and Conditions of Sale for such products, Intel assumes no liability
whatsoever, and Intel disclaims any express or implied warranty, relating to sale and/or use of Intel products including liability or warranties relating to
fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. Intel products are not
intended for use in medical, life saving, or life sustaining applications.
Intel may make changes to specifications and product descriptions at any time, without notice.
Designers must not rely on the absence or characteristics of any features or instructions marked "reserved" or "undefined." Intel reserves these for
future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them.
The LXT9860/9880 may contain design defects or errors known as errata which may cause the product to deviate from published specifications.
Current characterized errata are available on request.
Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order.
Copies of documents which have an ordering number and are referenced in this document, or other Intel literature may be obtained by calling
1-800-548-4725 or by visiting Intel’s website at http://www.intel.com.
Copyright © Intel Corporation, 2001
*Third-party brands and names are the property of their respective owners.
Datasheet
Advanced 10/100 Repeater with Integrated Management — LXT9860/9880
Contents
1.0
2.0
3.0
Other Related Documents…..........................................................................................
11
Pin Assignments and Signal Descriptions
.................................................................. 12
Functional Description
.................................................................................................. 31
3.1
3.2
Introduction.......................................................................................................... 31
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
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
Repeater Operation............................................................................................. 35
3.4.1 100 Mbps Repeater Operation ............................................................... 35
3.4.2 10 Mbps Repeater Operation ................................................................. 36
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
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
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
3.3
3.4
3.5
3.6
3.7
Datasheet
Document #: 248987
Revision#: 003
Rev Date: 08/07/01
3
LXT9860/9880 — Advanced 10/100 Repeater with Integrated Management
3.8
3.9
3.10
3.11
3.12
4.0
IRB Operation ..................................................................................................... 47
3.8.1 IRB Signal Types ................................................................................... 48
3.8.2 IRB Isolation ........................................................................................... 48
3.8.3 10 Mbps-Only Operation ........................................................................ 48
3.8.3.1 MAC IRB Access....................................................................... 48
3.8.3.2 Management Master Chain Arbitration...................................... 48
3.8.4 LXT98x/91x/98x0 Compatibility.............................................................. 48
MII Port Operation............................................................................................... 51
3.9.1 Preamble Handling................................................................................. 51
Serial Management I/F ........................................................................................ 52
3.10.1 SMI Signals ............................................................................................ 52
3.10.1.1Serial Clock ............................................................................... 53
3.10.1.2Serial Data I/O........................................................................... 53
3.10.2 Read and Write Operations.................................................................... 53
3.10.2.1SMI Collision Handling .............................................................. 53
3.10.2.2SMI Address Match Indication .................................................. 53
3.10.2.3SMI Frame Format .................................................................... 54
3.10.3 Address Assignment Methods ............................................................... 57
3.10.3.1Chain Arbitration Mechanism .................................................... 58
3.10.3.2PROM Arbitration Mechanism................................................... 58
3.10.3.3Address Re-Arbitration .............................................................. 59
3.10.4 Interrupt Functions ................................................................................. 59
Serial PROM Interface ........................................................................................ 59
Serial Configuration Interface.............................................................................. 60
Application Information
................................................................................................. 61
4.1
4.2
4.3
General Design Guidelines ................................................................................. 61
Typical Applications ............................................................................................ 62
Application Circuitry ............................................................................................ 63
4.3.1 Power and Ground ................................................................................. 63
4.3.1.1 Supply Filtering.......................................................................... 63
4.3.1.2 Ground Noise ............................................................................ 63
4.3.1.3 Power and Ground Plane Layout Considerations ..................... 63
4.3.1.4 Chassis Ground......................................................................... 64
4.3.1.5 The RBIAS Pin .......................................................................... 64
4.3.2 MII Terminations .................................................................................... 65
4.3.3 Twisted-Pair Interface ............................................................................ 65
4.3.3.1 Magnetics Information ............................................................... 66
4.3.4 Clock ...................................................................................................... 66
4.3.5 SMI and PROM Circuits ......................................................................... 68
4.3.6 LED Circuits ........................................................................................... 69
4.3.6.1 Direct Drive LEDs...................................................................... 69
4.3.6.2 LED Pins Multiplexed with Configuration Inputs........................ 69
4.3.6.3 Serial LEDs ............................................................................... 70
Inter-Repeater Backplane Compatibility.............................................................. 71
4.4.1 Local Backplane—3.3V Only ................................................................. 72
4.4.2 Stack Backplane—3.3V or 5V ................................................................ 72
4.4.2.1 3.3V and 5.0V Stacking Boards Cannot Be Mixed.................... 72
4.4
4
Datasheet
Document #: 248987
Revision#: 003
Rev Date: 08/07/01
Advanced 10/100 Repeater with Integrated Management — LXT9860/9880
5.0
6.0
Test Specifications.........................................................................................................
75
Register Definitions
....................................................................................................... 87
6.1
6.2
Register Map ....................................................................................................... 87
Counter Registers ............................................................................................... 95
6.2.1 Port Counter Registers........................................................................... 95
6.2.2 RMON Counter Registers ...................................................................... 96
Ethernet Address Registers ................................................................................ 99
6.3.1 Port Address Registers .......................................................................... 99
6.3.2 Search Address Registers...................................................................... 99
Repeater Port Control Registers .......................................................................101
6.4.1 General Port Control Registers ............................................................101
6.4.2 Port Link Control Register ....................................................................101
6.4.3 Port Learn Enable Register ..................................................................102
Repeater Port Status Registers.........................................................................102
PHY Port Status Registers ................................................................................104
PHY Port Control Registers...............................................................................107
Repeater Port Control/Status Registers ............................................................108
6.8.1 Device/Revision Register .....................................................................111
6.8.2 LED Control Registers.......................................................................... 111
6.8.3 LED Global Control Register ................................................................ 111
6.8.4 Port LED Control Register....................................................................111
6.8.5 LED Timer Control Register .................................................................112
6.8.6 Repeater Reset Register......................................................................113
6.8.7 Software Reset Register ......................................................................113
6.8.8 Interrupt Registers................................................................................113
Serial Controller Registers ................................................................................115
6.3
6.4
6.5
6.6
6.7
6.8
6.9
7.0
Mechanical Specifications...........................................................................................117
Datasheet
Document #: 248987
Revision#: 003
Rev Date: 08/07/01
5
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