VSC8221 datasheet(6/138 Pages) MICROSEMI

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VSC8221

Data Sheet

VMDS-10106 Revision 4.1

December 2006

6 of 10

Contents

General Description .........................................................................................................................................................1

Features and Benefits .....................................................................................................................................................1

Applications .....................................................................................................................................................................1

Applications Diagrams ....................................................................................................................................................2

4.1

SFP/GBiC Serial interface (SGMii or 802.3z SerDes) to Cat-5 ............................................................ 2

4.2

Media Converter (1000BASE-X to Cat-5) ............................................................................................. 2

Device Block Diagram .....................................................................................................................................................3

Relevant Specifications & Documentation ..................................................................................................................4

Data Sheet Conventions .................................................................................................................................................5

Package Pin Assignments & Signal Descriptions .................................................................................................. 14

8.1

Package Ball Diagram ........................................................................................................................ 14

8.2

Ball Locations and Signal Names ....................................................................................................... 15

8.3

Signal Type Descriptions .................................................................................................................... 15

8.4

Detailed Pin Descriptions ................................................................................................................... 16

System Schematics ...................................................................................................................................................... 27

9.1

System Schematic - SGMii/802.3z SerDes MAC to 1000Mbps CAT5 Media PHY Operating Mode . 27

9.2

System Schematic - 100Mbps Fiber Media implementation .............................................................. 28

Twisted Pair interface ................................................................................................................................................... 29

10.1 Twisted Pair Auto-Negotiation (iEEE802.3 Clause 28) ...................................................................... 29

10.2 Twisted Pair Auto MDi/MDi-X Function .............................................................................................. 29

10.3 Auto MDi/MDi-X in Forced 10/100 Link Speeds ................................................................................. 30

10.4 Forcing the PHY into MDi or MDi-X mode in 10/100/1000 Link Speeds ............................................ 31

10.5 Twisted Pair Link Speed Downshift .................................................................................................... 31

10.6 100Mbps Fiber Support Over Copper Media interface ....................................................................... 31

10.6.1

Register Settings ...................................................................................................................................31

Transformerless Operation for PiCMG 2.16 and 3.0 iP-based Backplanes ........................................................32

Dual Mode Serial Management interface (SMi) ........................................................................................................ 33

12.1 PHY Register Access with SMi in MSA mode .................................................................................... 33

12.1.1

Write Operation - Random Write ..........................................................................................................35

12.1.2

Write Operation - Sequential Write .......................................................................................................36

12.1.3

Read Operation - Random Read .........................................................................................................37

12.1.4

Read Operation - Sequential Read ......................................................................................................38

12.2 PHY Register Access with SMi in iEEE Mode .................................................................................... 38

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