Microchip VSC8512 Bruksanvisning

Microchip Inte kategoriserad VSC8512

Läs gratis den bruksanvisning för Microchip VSC8512 (29 sidor) i kategorin Inte kategoriserad. Guiden har ansetts hjälpsam av 8 personer och har ett genomsnittsbetyg på 3.5 stjärnor baserat på 4.5 recensioner. Har du en fråga om Microchip VSC8512 eller vill du ställa frågor till andra användare av produkten? Ställ en fråga

Ladda ner PDF

Sida 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