LXT980AHC datasheet, PDF - EEWORLD Datasheet

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LXT980AHC: DescriptionEthernet Transceiver, PQFP208, PLASTIC, QFP-208; CategoryWireless rf/communication Telecom circuit; File Size1MB，100 Pages; ManufacturerLevel One

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LXT980AHC Overview

Ethernet Transceiver, PQFP208, PLASTIC, QFP-208

LXT980AHC Parametric

Parameter Name	Attribute value
Maker	Level One
Parts packaging code	QFP
package instruction	,
Contacts	208
Reach Compliance Code	unknown
JESD-30 code	S-PQFP-G208
Number of functions	1
Number of terminals	208
Maximum operating temperature	70 °C
Minimum operating temperature
Package body material	PLASTIC/EPOXY
Package shape	SQUARE
Package form	FLATPACK
Certification status	Not Qualified
Nominal supply voltage	5 V
surface mount	YES
Telecom integrated circuit types	ETHERNET TRANSCEIVER
Temperature level	COMMERCIAL
Terminal form	GULL WING
Terminal location	QUAD

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DATA SHEET

MARCH, 1999

Revision 1.4

LXT980/980A

General Description

Dual-Speed, 5-Port Fast Ethernet Repeater

Features

• Four 10/100 ports with complete twisted-pair PHYs

including integrated filters and 100BASE-FX PECL

interfaces.

• 10/100 MII port connection to either MAC or PHY.

• Independent

operation.

segments

for

and

100 Mbps

with Integrated Management Support

The LXT980 is a 5-port 10/100 Class II Repeater that is

fully compliant with IEEE 802.3 standards. Four ports

directly support either 100BASE-TX/10BASE-T copper

media or 100BASE-FX fiber media via pseudo-ECL

(PECL) interfaces. The fifth port, a 10 or 100 Mbps Media

Independent Interface (MII), connects to Media Access

Controllers (MACs) for bridge/switch applications. At

100 Mbps, the MII can also be configured to interface to

another PHY device, such as the LXT970. This data sheet

applies to all LXT980 products (LXT980, LXT980A, and

any subsequent variants), except as specifically noted.

The LXT980 provides auto-negotiation with parallel

detection for the four PHY ports. These ports can also be

manually configured, either by hardware or software. The

LXT980 provides two internal repeater state machines—

one operating at 10 Mbps and one at 100 Mbps. Once

configured, the LXT980 automatically connects each port

to the appropriate repeater.

The LXT980 also provides two Inter-Repeater Backplanes

(IRBs) for expansion — one operating at 10 Mbps and one

at 100 Mbps. Up to 240 ports can logically be combined

into one repeater using these buses. The LXT980 supports

SNMP and RMON management via on-chip 32- and 64-bit

counters. The counters and control information are

accessible via a high-speed Serial Management Interface

(SMI). The device supports two Source Address Tracking

registers per port and a Source Address Matching Function.

• Cascadable Inter-Repeater Backplanes (IRBs).

• Hardware assist for RMON and the Repeater MIB.

• 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.

• Case temperature range: 0-115

LXT980/980A Block Diagram

10M IRB

10 Mbps

Backplane

100 Mbps

Backplane

10BASE-T

Repeater

100BASE-X

Repeater

10/100

E'net PHY

10/100

E'net PHY

10/100

E'net PHY

10/100

E'net PHY

MII

Twisted Pair_I/O

Fiber_I/O

Twisted Pair_I/O

Fiber_I/O

Twisted Pair_I/O

Fiber_I/O

Twisted Pair_I/O

Fiber_I/O

Reversible MII

100M IRB

Mode Control

Serial Mgmt

Serial Port

Device

Management

RMON &

SNMP

Counters

Port & Mgmt

Status Indicators

LED Drivers

Port Switching Logic

Refer to www.level1.com for most current information.

)

LXT980/980A Dual-Speed, 5-Port Fast Ethernet Repeater

TABLE OF CONTENTS

Pin Assignments and Signal Descriptions ..................................................................................................... 4

Functional Description ...................................................................................................................................15

Introduction.................................................................................................................................................15

TP/FX Port Configuration .......................................................................................................................................18

Forced Operation ............................................................................................................................................18

Auto-Negotiation .............................................................................................................................................18

Link Establishment and TP Port Connection...................................................................................................18

Changing Port Speed On the Fly ....................................................................................................................18

MII Port Configuration ............................................................................................................................................18

Interface Descriptions.............................................................................................................................................19

Twisted-Pair Interface .....................................................................................................................................19

Fiber Interface .................................................................................................................................................20

Media Independent Interface (MII) ..................................................................................................................20

Serial Management Interface ..........................................................................................................................20

Repeater Operation ................................................................................................................................................21

100 Mbps Repeater Operation........................................................................................................................21

10 Mbps Repeater Operation ..........................................................................................................................21

Management Support .............................................................................................................................................22

Configuration and Status.................................................................................................................................22

SNMP and RMON Support .............................................................................................................................22

Source Address Management.........................................................................................................................22

LED Drivers ............................................................................................................................................................22

Requirements .............................................................................................................................................23

Power .....................................................................................................................................................................23

Clock ......................................................................................................................................................................23

Bias Current ...........................................................................................................................................................23

Reset ......................................................................................................................................................................23

PROM.....................................................................................................................................................................23

ChipID ....................................................................................................................................................................23

Management Master I/O Link .................................................................................................................................23

IRB Bus Pull-Ups....................................................................................................................................................23

LED Operation............................................................................................................................................24

Blink Rates .............................................................................................................................................................24

Power-Up and Reset Conditions ............................................................................................................................24

Port LEDs ...............................................................................................................................................................24

Segment LEDs .......................................................................................................................................................24

Global LEDs ...........................................................................................................................................................24

IRB Operation.............................................................................................................................................28

MAC IRB Access................................................................................................................................................... 28

IRB Isolation .......................................................................................................................................................... 28

MMSTRIN, MMSTROUT ....................................................................................................................................... 28

MII Port Operation ......................................................................................................................................29

PHY Mode Operation .............................................................................................................................................30

MAC Mode Operation.............................................................................................................................................30

MII Port Timing Considerations ..............................................................................................................................31

LXT980/980A Table of Contents

Serial Management Interface ..................................................................................................................... 32

Serial Clock ........................................................................................................................................................... 32

Serial Data I/O........................................................................................................................................................32

Read and Write Operations....................................................................................................................................32

Management Frame Format ...........................................................................................................................32

Auto-Clearing Registers ..................................................................................................................................32

Interrupt Functions .................................................................................................................................................34

Address Arbitration.................................................................................................................................................35

Serial EEPROM Interface ......................................................................................................................... 37

Application Information ................................................................................................................................. 38

General Design Guidelines ........................................................................................................................ 38

Power Supply Filtering......................................................................................................................... 38

Power and Ground Plane Layout Considerations ............................................................................... 37

MII Terminations .................................................................................................................................. 39

The RBIAS Pin .................................................................................................................................... 40

The Twisted-Pair Interface................................................................................................................... 39

The Fiber Interface .............................................................................................................................. 39

Magnetics Information ......................................................................................................................... 40

Typical Application Circuitry ....................................................................................................................... 41

Test Specifications ......................................................................................................................................... 48

Absolute Maximum Ratings ....................................................................................................................... 48

Recommended Operating Conditions ........................................................................................................ 48

Input Clock Requirements.......................................................................................................................... 49

I/O Electrical Characteristics ...................................................................................................................... 49

100 Mbps IRB Electrical Characteristics .................................................................................................... 50

10 Mbps IRB Electrical Characteristics ...................................................................................................... 51

100BASE-TX Transceiver Electrical Characteristics.................................................................................. 51

100BASE-FX Transceiver Electrical Characteristics.................................................................................. 52

10BASE-T Transceiver Electrical Characteristics ...................................................................................... 52

100 Mbps Port-to-Port Delay Timing .......................................................................................................... 53

100BASE-TX Timing .................................................................................................................................. 54

100BASE-FX Timing .................................................................................................................................. 58

10BASE-T Timing ...................................................................................................................................... 62

100 Mbps IRB Timing................................................................................................................................. 64

10 Mbps IRB Timing................................................................................................................................... 65

Serial Management Timing ........................................................................................................................ 67

PROM Interface Timing.............................................................................................................................. 68

Register Definitions........................................................................................................................................ 69

Counter Registers ...................................................................................................................................... 69

Ethernet Address Registers ....................................................................................................................... 73

Control and Status Registers ..................................................................................................................... 75

Configuration Registers.............................................................................................................................. 81

Auto-Negotiation Registers ........................................................................................................................ 86

Mechanical Specifications............................................................................................................................. 90

Revision History ............................................................................................................................................. 91

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