LXT970A datasheet(3/74 Pages) INTEL

3 / 74 page

Datasheet

Dual-Speed Fast Ethernet Transceiver — LXT970A

Contents

1.0

Pin Assignments and Signal Descriptions....................................................10

2.0

Functional Description...........................................................................................18

2.1

Introduction.......................................................................................................... 18

2.2

Interfaces (Network Media/Protocol Support) ..................................................... 19

2.2.1

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

2.2.2

Fiber Interface ........................................................................................ 19

2.2.3

MII Interface ........................................................................................... 20

2.2.3.1 Selectable Driver Levels............................................................ 20

2.2.3.2 MII Data Interface ...................................................................... 21

2.2.3.3 Repeater Mode.......................................................................... 24

2.2.3.4 MII Management Interface ........................................................ 24

2.2.4

Hardware Control Interface .................................................................... 26

2.3

Operating Requirements ..................................................................................... 27

2.3.1

Power Supply Requirements.................................................................. 27

2.3.1.1 Optional MII Power Supply ........................................................ 27

2.3.2

Reference Clock Requirements ............................................................. 27

2.3.2.1 Master Clock Mode ................................................................... 28

2.3.2.2 Slave Clock Mode .....................................................................28

2.3.3

Bias Circuit Requirements...................................................................... 29

2.4

Initialization.......................................................................................................... 29

2.4.1

Control Mode Selection .......................................................................... 29

2.4.1.1 MDIO Control Mode .................................................................. 29

2.4.1.2 Manual Control Mode ................................................................ 29

2.4.2

Link Configuration ..................................................................................29

2.4.2.1 Manual Configuration ................................................................ 30

2.4.2.2 Auto-Negotiation/Parallel Detection .......................................... 30

2.5

Monitoring Operational Status............................................................................. 31

2.5.1

Monitoring Status via MII Registers........................................................ 31

2.5.2

Monitoring Status via Indicator Pins ....................................................... 32

2.6

100BASE-X Operation ........................................................................................ 32

2.6.1

100BASE-X MII Operations.................................................................... 32

2.6.2

100BASE-X Network Operations ........................................................... 33

2.7

10BASE-T Operation........................................................................................... 35

2.7.1

10BASE-T MII Operations...................................................................... 35

2.7.2

10BASE-T Network Operations.............................................................. 35

2.8

Protocol Sublayer Operations ............................................................................. 35

2.8.1

PCS Sublayer .........................................................................................35

2.8.1.1 100X Preamble Handling .......................................................... 36

2.8.1.2 10T Preamble Handling............................................................. 36

2.8.1.3 Data Errors (100X Only) ............................................................ 36

2.8.1.4 Collision Indication .................................................................... 37

2.8.1.5 SQE (10T Only) ......................................................................... 38

2.8.1.6 Jabber (10T Only) .....................................................................38

2.8.2

PMA Layer.............................................................................................. 38

2.8.2.1 100TX Link Options ................................................................... 38

2.8.2.2 10T Link Test............................................................................. 38

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