
COM Express® Carrier Board Design Guide
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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 .......................................................................... 74
3.1
ATX Style Power Control ......................................................................... 75
Chapter 4 Carrier Board PCB Layout Guidelines ....................................... 78
4.1
General .................................................................................................... 79
4.2
PCB Stack-ups ......................................................................................... 79
4.3
Trace Impedance Considerations ............................................................ 82
Chapter 5 Mechanical Considerations ........................................................ 83
5.1
Form Factors ............................................................................................ 83
5.2
Heatspreader ........................................................................................... 84
5.3
COM Express Carrier Board ....................................
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5.4
COM Express Module and Heatsink ........................
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Содержание ET976
Страница 1: ...COM EXPRESS CARRIER BOARD DESIGN GUIDE Version 1 0 January 2022...
Страница 10: ...4 COM Express Carrier Board Design Guide 2 1 2 Schematic Examples Figure 2 PCI Express x1 Slot Example...
Страница 11: ...COM Express Carrier Board Design Guide 5 Figure 3 PCI Express x4 Slot Example...
Страница 12: ...6 COM Express Carrier Board Design Guide Figure 4 PCIe Mini Card Reference Circuitry...
Страница 16: ...10 COM Express Carrier Board Design Guide 2 2 1 Reference Schematics Figure 5 x1 x4 x8 x16 Slot...
Страница 18: ...12 COM Express Carrier Board Design Guide 2 3 1 1 Reference Schematic Figure 6 DisplayPort Reference Schematics...
Страница 19: ...COM Express Carrier Board Design Guide 13 Figure 7 HDMI Example 1...
Страница 20: ...14 COM Express Carrier Board Design Guide Figure 7 HDMI Example 2...
Страница 21: ...COM Express Carrier Board Design Guide 15 Figure 8 DVI Example 1...
Страница 22: ...16 COM Express Carrier Board Design Guide Figure 8 DVI Example 2...
Страница 30: ...24 COM Express Carrier Board Design Guide 2 6 2 Reference Schematics Figure 12 USB 3 0 Example 1...
Страница 31: ...COM Express Carrier Board Design Guide 25 Figure 12 USB 3 0 Example 2...
Страница 36: ...30 COM Express Carrier Board Design Guide 2 8 2 Reference Schematics Figure 14 LVDS Reference Schematic 1...
Страница 37: ...COM Express Carrier Board Design Guide 31 Figure 14 LVDS Reference Schematic 2...
Страница 40: ...34 COM Express Carrier Board Design Guide 2 9 2 Reference Schematics Figure 15 eDP Reference Schematic...
Страница 43: ...COM Express Carrier Board Design Guide 37 2 10 2 VGA Reference Schematics Figure 16 VGA Reference Schematics 1...
Страница 44: ...38 COM Express Carrier Board Design Guide Figure 16 VGA Reference Schematics 2...
Страница 48: ...42 COM Express Carrier Board Design Guide Figure 18 HDA Example Schematic 2...
Страница 52: ...46 COM Express Carrier Board Design Guide Figure 19 LPC Super I O Example 2...
Страница 61: ...COM Express Carrier Board Design Guide 55 Figure 24 General Purpose Serial Port Example 2...
Страница 63: ...COM Express Carrier Board Design Guide 57 2 17 2 Reference Schematics Figure 25 CAN Bus Example 1...
Страница 66: ...60 COM Express Carrier Board Design Guide 2 18 1 Speaker Output Figure 26 Speaker Output Circuitry...
Страница 70: ...64 COM Express Carrier Board Design Guide Figure 28 PWRBTN and SYS_RESET Circuitry...
Страница 72: ...66 COM Express Carrier Board Design Guide 2 18 6 Fan Connector Figure 31 Fan Connector Reference Schematic...
Страница 84: ...78 COM Express Carrier Board Design Guide Chapter 4 Carrier Board PCB Layout Guidelines...
Страница 88: ...82 COM Express Carrier Board Design Guide 4 3 Trace Impedance Considerations Figure 39 Stackup Impedance...