Microchip VSC8512 Handleiding

Microchip Niet gecategoriseerd VSC8512

Bekijk gratis de handleiding van Microchip VSC8512 (29 pagina’s), behorend tot de categorie Niet gecategoriseerd. Deze gids werd als nuttig beoordeeld door 14 mensen en kreeg gemiddeld 4.4 sterren uit 7.5 reviews. Heb je een vraag over Microchip VSC8512 of wil je andere gebruikers van dit product iets vragen? Stel een vraag

Download PDF

Pagina 1/29

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

8 Thermal Considerations ............................................................................................................... 11

8.1 Heat Removal from Device ............................................................................................................... 11

8.2 Temperature Measurement ............................................................................................................. 12

8.2.1 Temperature Diode Options ................................................................................................................. 12

9 Copper Interface .......................................................................................................................... 13

9.1 Layout Considerations ...................................................................................................................... 13

VSC8512 Design Guide

VPPD-01611 VSC8512 Application Note Revision 1.0

9.2 Using PHYs in Backplane Applications .............................................................................................. 13

9.3 Surge Protection ............................................................................................................................... 14

9.4 PHY Miscellaneous ........................................................................................................................... 14

10 MAC Interfaces ........................................................................................................................... 15

10.1 QSGMII Interface ............................................................................................................................ 1

10.2 SGMII/SerDes Interface .................................................................................................................. 15

10.3 Design Rules ................................................................................................................................... 1

10.4 AC Coupling Capacitors .................................................................................................................. 16

10.5 SerDes Media ................................................................................................................................. 1

10.5.1 Unidirectional for Streaming ............................................................................................................... 16

11 Miscellaneous Design Considerations ........................................................................................ 17

11.1 SMI (MDC/MDIO) Device Address .................................................................................................. 17

11.2 REF_FILT / REF_REXT Pins ............................................................................................................... 17

11.3 Device Clock Input .......................................................................................................................... 1

11.3.1 Clock Power Supply Filtering ............................................................................................................... 18

11.4 COMA_MODE ................................................................................................................................. 1

11.5 CLKOUT Pin ..................................................................................................................................... 1

11.6 Serial Management Interface (SMI) ............................................................................................... 18

11.7 JTAG (Boundary Scan) Design ......................................................................................................... 19

11.7.1 JTAG Interface “Never” Used .............................................................................................................. 19

11.7.2 JTAG Interface Used In Board Design .................................................................................................. 19

11.7.3 AC-JTAG ............................................................................................................................................... 19

11.8 LEDs ................................................................................................................................................ 1

11.8.1 Dual LED per Port Option .................................................................................................................... 20

11.8.2 Serial LED Option ................................................................................................................................. 20

11.8.3 Adjustable Brightness LED ................................................................................................................... 20

11.9 GPIO and Multi Mode Pins ............................................................................................................. 20

11.9.1 Fast Link Failure ................................................................................................................................... 20

11.10 CMODE Interface .......................................................................................................................... 20

11.11 SyncE Support ............................................................................................................................... 20

11.12 Controlling SFPs and Talking to I2C Devices ................................................................................. 20

11.13 Unused PHY Ports ......................................................................................................................... 2

12 Software Considerations ............................................................................................................. 22

12.1 Resources ....................................................................................................................................... 2

12.2 Configuration .................................................................................................................................. 2

12.3 Minimum Register Configuration ................................................................................................... 22

12.4 Power Management Software Features ......................................................................................... 22

12.4.1 EEE ....................................................................................................................................................... 22

12.4.2 ActiPHY ................................................................................................................................................ 22

12.4.3 PerfectReach ....................................................................................................................................... 22