Microchip VSC8512 Manual

Microchip Ikke kategoriseret VSC8512

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VSC8512

Application Note

VSC8512 Design Guide

VPPD-01611 VSC8512 Application Note Revision 1.0

Contents

1 Revision History 1.0 ....................................................................................................................... 1

1.1 Revision 1.0 ........................................................................................................................................

2 Introduction ................................................................................................................................... 2

2.1 References .........................................................................................................................................

2.1.1 Vitesse Documents .................................................................................................................................. 2

2.1.2 IEEE Standards ......................................................................................................................................... 2

2.1.3 External Documents ................................................................................................................................ 2

3 Key Item Checklist .......................................................................................................................... 3

4 Design Aids ..................................................................................................................................... 4

4.1 Reference Design ................................................................................................................................

4.2 IBIS Model ..........................................................................................................................................

4.3 BSDL File .............................................................................................................................................

4.4 OrCAD Symbol ....................................................................................................................................

5 Copper Magnetics Modules ........................................................................................................... 5

5.1 Return Loss Parameter ....................................................................................................................... 5

5.2 Secondary Magnetics Parameters ...................................................................................................... 5

6 EMI Management .......................................................................................................................... 6

6.1 PHY EMI testing ..................................................................................................................................

6.2 MAC Interface Design Keys .................................................................................................................

6.3 Copper Interface Design Keys .............................................................................................................

6.4 Grounding Considerations ..................................................................................................................

6.4.1 Ground Isolation ...................................................................................................................................... 6

6.5 Bob Smith Termination .......................................................................................................................

7 Power Supply Considerations ........................................................................................................ 9

7.1 Power Supply Planes ..........................................................................................................................

7.2 Analog Power Plane Filtering .............................................................................................................. 9

7.3 Local Decoupling .................................................................................................................................

7.4 Power Supply and Clock Sequencing ................................................................................................ 10

7.5 Power Supply Estimated Requirements ........................................................................................... 10