LXT9762/9782
Fast Ethernet 10/100 Multi-Port Transceiver with Serial MII
Datasheet
General Description
The LXT9782 is an eight-port PHY Fast Ethernet Transceiver that supports IEEE 802.3 physical
layer applications at both 10 and 100 Mbps. The LXT9762 offers the same features and
functionality in a six-port device. This data sheet uses the singular designation “LXT97x2” to
refer to both devices.
The LXT97x2 interfaces multiple Serial Media Independent Interface (SMII) compliant
controllers to 10BASE-T and/or 100BASE-TX media.
All network ports provide a combination twisted-pair (TP) or pseudo-ECL (PECL) interface for
a 10/100BASE-TX or 100BASE-FX connection.
The LXT97x2 provides three discrete LED drivers for each port, and eight global serial LED
outputs. It supports both half- and full-duplex operation at 10 and 100 Mbps and requires only a
single 3.3V power supply.
Application
s
100BASE-T, 10/100-TX, or 100BASE-FX Switches and multi-port NICs.
Product Features
s
s
s
s
s
Multiple independent IEEE 802.3-
compliant 10/100 ports with integrated
filters
Proprietary Optimal Signal Processing
(OSP™) design improves SNR by 3 dB
over ideal analog filters
Robust baseline wander correction for
improved 100BASE-TX performance
100BASE-FX fiber-optic capability on all
ports
Supports both auto-negotiation and legacy
systems without auto-negotiation capability
s
s
s
s
s
s
s
s
JTAG boundary scan
Multiple Serial MII (SMII) ports for
independent PHY port operation
Configurable via MDIO port or external
control pins
Maskable interrupts
Very low power consumption
(400 mW per port, typical)
3.3V operation
208-pin PQFP and 272-lead BGA
0-70
o
C ambient temperature range
As of January 15, 2001, this document replaces the Level One document
LXT9762/9782 — Fast Ethernet 10/100 Multi-Port Transceiver with Serial MII.
Order Number: 249039-001
January 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 LXT9762/9782 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
Fast Ethernet 10/100 Multi-Port Transceiver with Serial MII — LXT9762/9782
Contents
.
1.0
2.0
Preliminary Pin Assignments and Signal Descriptions
...........................10
Functional Description
...........................................................................................20
2.1
Introduction..........................................................................................................20
2.1.1 OSP™ Architecture ................................................................................20
2.1.2 Comprehensive Functionality .................................................................20
Interface Descriptions..........................................................................................21
2.2.1 10/100 Network Interface .......................................................................21
2.2.2 SMII Data Interface ................................................................................22
2.2.3 Configuration Management Interface .....................................................22
Operating Requirements .....................................................................................25
2.3.1 Power Requirements..............................................................................25
2.3.2 Clock Requirements ...............................................................................25
Initialization..........................................................................................................25
2.4.1 Hardware Configuration Settings ...........................................................26
2.4.2 Reset ......................................................................................................27
2.4.3 Power-Down Mode.................................................................................28
Link Establishment ..............................................................................................28
2.5.1 Auto-Negotiation.....................................................................................28
2.5.2 Parallel Detection ...................................................................................29
Serial MII Operation ............................................................................................29
2.6.1 Reference Clock.....................................................................................31
2.6.2 SYNC Pulse ...........................................................................................31
2.6.3 Transmit Data Stream ............................................................................31
2.6.4 Receive Data Stream .............................................................................32
2.6.5 Loopback................................................................................................33
2.6.6 Collision..................................................................................................33
100 Mbps Operation............................................................................................34
2.7.1 100BASE-X Network Operations ...........................................................34
2.7.2 .100BASE-X Protocol Sublayer Operations ...........................................35
10 Mbps Operation..............................................................................................39
2.8.1 10T Preamble Handling..........................................................................40
2.8.2 10T Dribble Bits......................................................................................40
2.8.3 10T Link Test..........................................................................................40
2.8.4 10T Jabber .............................................................................................40
Monitoring Operations .........................................................................................40
2.9.1 Serial LED Functions..............................................................................40
2.9.2 Per-Port LED Driver Functions ...............................................................42
2.9.3 Monitoring Auto-Negotiation...................................................................43
2.9.4 Using the Quick Status Register ............................................................44
Boundary Scan (JTAG1149.1) Functions............................................................44
2.10.1 Boundary Scan Interface........................................................................44
2.10.2 State Machine ........................................................................................45
2.10.3 Instruction Register ................................................................................45
2.10.4 Boundary Scan Register ........................................................................45
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
2.10
Datasheet
3
LXT9762/9782 — Fast Ethernet 10/100 Multi-Port Transceiver with Serial MII
3.0
Application Information
......................................................................................... 46
3.1
Design Recommendations .................................................................................. 46
3.1.1 General Design Guidelines .................................................................... 46
3.1.2 Power Supply Filtering ........................................................................... 46
3.1.3 Power and Ground Plane Layout Considerations .................................. 47
3.1.4 MII Terminations .................................................................................... 47
3.1.5 The RBIAS Pin ....................................................................................... 47
3.1.6 The Twisted-Pair Interface ..................................................................... 47
3.1.7 The Fiber Interface................................................................................. 48
Typical Application Circuits ................................................................................. 49
3.2
4.0
5.0
6.0
Test Specifications
.................................................................................................. 53
Register Definitions
................................................................................................ 63
Package Specifications
......................................................................................... 77
4
Datasheet
Fast Ethernet 10/100 Multi-Port Transceiver with Serial MII — LXT9762/9782
Figures
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
LXT 9782 Block Diagram ...................................................................................... 9
LXT9782HC (PQFP) Preliminary Pin Assignments............................................10
LXT9782BC (PBGA) Preliminary Pin Assignments............................................11
LXT9762HC (PQFP) Preliminary Pin Assignments ............................................12
LXT97x2 Interfaces ............................................................................................21
Port Address Scheme .........................................................................................23
Management Interface Read Frame Structure ...................................................23
Management Interface Write Frame Structure ...................................................24
Interrupt Logic ....................................................................................................24
Initialization Sequence .......................................................................................26
Hardware Control Settings .................................................................................27
Link Establishment Process ...............................................................................29
Simplified SMII Application Diagram ..................................................................30
100Mbps Serial MII Data Flow ...........................................................................31
Serial MII Transmit Synchronization ..................................................................32
Loopback Paths...................................................................................................33
Serial MII Receive Synchronization ....................................................................33
100BASE-X Frame Format ...............................................................................34
Protocol Sublayers .............................................................................................36
Serial LED Streams.............................................................................................42
LED Pulse Stretching ..........................................................................................43
Quick Status Register..........................................................................................44
Power and Ground Supply Connections ............................................................49
Typical Twisted-Pair Interface ............................................................................50
Typical Fiber Interface ........................................................................................51
Typical Serial LED Interface................................................................................52
MII Sync Timing...................................................................................................56
100BASE-TX Receive Timing .............................................................................56
SMII Output Delay Test Setup............................................................................57
100BASE-TX Transmit Timing ............................................................................57
100BASE-FX Receive Timing .............................................................................58
100BASE-FX Transmit Timing ............................................................................58
10BASE-T Receive Timing..................................................................................59
10BASE-T Transmit Timing.................................................................................59
Auto-Negotiation and Fast Link Pulse Timing ....................................................60
Fast Link Pulse Timing .......................................................................................60
MDIO Write Timing (MDIO Sourced by MAC) ....................................................61
MDIO Read Timing (MDIO Sourced by PHY) ....................................................61
Power-Up Timing ................................................................................................62
Reset and Power-Down Recovery Timing .........................................................62
PHY Identifier Bit Mapping ..................................................................................68
LXT97x2 PQFP Package Specification...............................................................77
LXT97x2 PBGA Package Specification...............................................................78
Datasheet
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
