Table of contents
Preface ........................................................................................................................................................................ 2
Trademarks .................................................................................................................................................................. 2
Revision history ........................................................................................................................................................... 2
Table of contents .......................................................................................................................................................... 3
Conventions ................................................................................................................................................................. 5
1. Overview .................................................................................................................................................................... 7
2. Mechanism ................................................................................................................................................................. 8
3. Serial Console and Video Output ............................................................................................................................ 9
4. Boot Device.............................................................................................................................................................. 10
5. Power Source .......................................................................................................................................................... 11
6. Control Signal .......................................................................................................................................................... 13
6.1. Reset Signal ....................................................................................................................................................... 13
6.2. Power Button Signal ........................................................................................................................................... 13
6.3. Battery Low Voltage Sense Signal ..................................................................................................................... 13
7. I/O Port ..................................................................................................................................................................... 14
7.1. High Speed Signal .............................................................................................................................................. 14
7.2. Signal Trace Guideline ....................................................................................................................................... 15
7.3. PEG / PCI Express ............................................................................................................................................. 16
7.4. USB .................................................................................................................................................................... 20
7.5. SATA .................................................................................................................................................................. 22
7.6. Ethernet .............................................................................................................................................................. 23
7.7. UART .................................................................................................................................................................. 24
7.8. Analog VGA ........................................................................................................................................................ 24
7.9. DisplayPort ......................................................................................................................................................... 24
7.10. Embedded DisplayPort ..................................................................................................................................... 24
7.11. I
2
C ..................................................................................................................................................................... 24
7.12. SMBus .............................................................................................................................................................. 25
7.13. LPC ................................................................................................................................................................... 25
7.14. HD Audio .......................................................................................................................................................... 26
7.15. GPIO ................................................................................................................................................................. 26
7.16. Speaker ............................................................................................................................................................ 27
7.17. SPI .................................................................................................................................................................... 27
7.18. THRM ............................................................................................................................................................... 27
8. Connector Signal .................................................................................................................................................... 28
9. Carrier Board Design Checklist ............................................................................................................................. 36
Notes ............................................................................................................................................................................ 37