VSC8664 to VSC8574 Migration Design Guide

VPPD-02728 VPPD-02728 VSC8664 VSC8574 Application Note Revision 1.03

Contents

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

1.1 Revision 1.03 ...................................................................................................................................... 1

1.2 Revision 1.02 ...................................................................................................................................... 1

1.3 Revision 1.01 ...................................................................................................................................... 1

1.4 Revision 1.0 ........................................................................................................................................ 1

1.5 Revision 0.51 ...................................................................................................................................... 1

1.6 Revision 0.50 ...................................................................................................................................... 1

1.7 Revision 0.49 ...................................................................................................................................... 1

1.8 Revision 0.48 ...................................................................................................................................... 1

1.9 Revision 0.47 ...................................................................................................................................... 1

1.10 Revision 0.45 .................................................................................................................................... 1

1.11 Revision 0.44 .................................................................................................................................... 2

1.12 Revision 0.43 .................................................................................................................................... 2

1.13 Revision 0.41 .................................................................................................................................... 2

1.14 Revision 0.4 ...................................................................................................................................... 2

1.15 Revision 0.3 ...................................................................................................................................... 2

1.16 Revision 0.2 ...................................................................................................................................... 2

2 Introduction ................................................................................................................................... 3

3 Voltage Supply Changes ................................................................................................................. 5

4 Pinout Changes .............................................................................................................................. 6

5 VSC8664 Features Not In VSC8574 ................................................................................................ 8

5.1 CMODE Initialization ........................................................................................................................... 8

5.2 Temperature Diode ............................................................................................................................ 8

5.3 CLKOUT ............................................................................................................................................... 8

5.4 Crystal Clocking Support ..................................................................................................................... 8

6 VSC8574 Features Not In VSC8664 ................................................................................................ 9

6.1 IEEE-1588V2 ....................................................................................................................................... 9

6.1.1 High bandwidth SPI for reading 1588 Timestamp FIFO ........................................................................... 9

6.2 Energy Efficient Ethernet (EEE) ........................................................................................................... 9

6.3 Temperature Measurement Management ........................................................................................ 9

6.4 Serial LED Enhancement ..................................................................................................................... 9

6.5 Coma_Mode for Initialization ............................................................................................................. 9

6.6 Dual End Ref_CLK ............................................................................................................................... 9

6.7 Recovered Clock input Pin For Clock Squelching ................................................................................ 9

7 Registers Difference Summary ..................................................................................................... 10