IBASE Technology COM EXPRESS ET976 Design Manual page 5

2.16 General Purpose Serial Interface ............................................................. 53
2.16.1 Signal Definitions ............................................................................... 53
2.16.2 Reference Schematics ....................................................................... 54
2.16.2.1 General Purpose Serial Port Example ................................................ 54
2.16.3 Routing Considerations ...................................................................... 56
2.17 CAN Interface .......................................................................................... 56
2.17.1 Signal Definitions ............................................................................... 56
2.17.2 Reference Schematics ....................................................................... 57
2.17.3 Routing Considerations ...................................................................... 58
2.18 Miscellaneous Signals ............................................................................. 59
2.18.1 Speaker Output .................................................................................. 60
2.18.2 RTC Battery Implementation .............................................................. 61
2.18.3 Power Management Signals .............................................................. 62
2.18.4 Watchdog Timer ................................................................................. 65
2.18.5 General Purpose Input/Output (GPIO) ............................................... 65
2.18.6 Fan Connector ................................................................................... 66
2.18.7 Thermal Interface ............................................................................... 67
2.19 PCI Bus .................................................................................................... 68
2.19.1 Signal Definitions ............................................................................... 68
2.19.2 Reference Schematics ....................................................................... 70
2.20 IDE and CompactFlash (PATA) ............................................................... 72
2.20.1 Signal Definitions ............................................................................... 72
Chapter 3 Power and Reset ..........................................................................
3.1 ATX Style Power Control ......................................................................... 75
Chapter 4 Carrier Board PCB Layout Guidelines .......................................
4.1 General .................................................................................................... 79
4.2 PCB Stack-ups ......................................................................................... 79
4.3 Trace Impedance Considerations ............................................................ 82
Chapter 5 Mechanical Considerations ........................................................
5.1 Form Factors ............................................................................................ 83
5.2 Heatspreader ........................................................................................... 84
5.3 COM Express Carrier Board .................................... 錯誤! 尚未定義書籤。
5.4 COM Express Module and Heatsink ........................ 錯誤! 尚未定義書籤。
COM Express® Carrier Board Design Guide
74
78
83
v