2.8.4. Routing Considerations...................................................................................................80
2.9. USB 3.0................................................................................................................................ 81
2.9.1. Signal Definitions.............................................................................................................81
2.9.2. Reference Schematics.....................................................................................................84
2.9.3. Avoiding Back-driving Problems......................................................................................86
2.9.4. Routing Considerations...................................................................................................86
2.10. SATA..................................................................................................................................... 87
2.10.1. Signal Definitions.............................................................................................................87
2.10.2. Reference Schematic......................................................................................................89
2.10.3. Routing Considerations...................................................................................................90
2.11. LVDS..................................................................................................................................... 91
2.11.1. Signal Definitions.............................................................................................................91
2.11.2. Reference Schematics.....................................................................................................97
2.11.3. Routing Considerations...................................................................................................98
2.12. Embedded DisplayPort (eDP).............................................................................................99
2.12.1. Signal Definitions.............................................................................................................99
2.12.2. Reference Schematics..................................................................................................100
2.12.3. Routing Considerations.................................................................................................100
2.13. VGA.................................................................................................................................... 101
2.13.1. Signal Definitions...........................................................................................................101
2.13.2. VGA Connector..............................................................................................................101
2.13.3. VGA Reference Schematics..........................................................................................102
2.13.4. Routing Considerations.................................................................................................103
2.14. TV-Out................................................................................................................................ 104
2.15. Digital Audio Interfaces....................................................................................................105
2.15.1. Reference Schematics..................................................................................................107
2.16. LPC Bus – Low Pin Count Interface.................................................................................111
2.16.1. Signal Definition.............................................................................................................111
2.16.2. LPC Bus Reference Schematics....................................................................................111
2.16.3. Routing Considerations..................................................................................................116
2.17. SPI – Serial Peripheral Interface Bus...............................................................................118
2.17.1. Signal Definition.............................................................................................................118
2.17.2. SPI Reference Schematics............................................................................................119
2.17.3. Routing Considerations.................................................................................................120
2.18. General Purpose I2C Bus Interface.................................................................................121
2.18.1. Signal Definitions...........................................................................................................121
2.18.2. Reference Schematics..................................................................................................121
2.18.3. Connectivity Considerations..........................................................................................122
2.19. System Management Bus (SMBus).................................................................................123
2.19.1. Signal Definitions...........................................................................................................123
2.19.2. Routing Considerations.................................................................................................124
2.20. General Purpose Serial Interface.....................................................................................125
2.20.1. Signal Definitions...........................................................................................................125
2.20.2. Reference Schematics..................................................................................................126
2.20.3. Routing Considerations.................................................................................................126
2.21. CAN Interface....................................................................................................................127
PICMG
®
COM Express
®
Carrier Board Design Guide Rev. 2.0 / December 6, 2013
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