VSC8221
Data Sheet
Contents
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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
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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
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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
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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
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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
12.1.2
12.1.3
12.1.4
Write Operation - Random Write ..........................................................................................................35
Write Operation - Sequential Write .......................................................................................................36
Read Operation - Random Read .........................................................................................................37
Read Operation - Sequential Read ......................................................................................................38
12.2 PHY Register Access with SMi in iEEE Mode .................................................................................... 38
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VMDS-10106 Revision 4.1
December 2006
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