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SOM-6869 COMe TYPE6

R140 2019’10’25

１

Contents

1 Introduction ........................................................................................................ ９

1.1 About This Document ..................................................................................... ９

1.2 Signal Table Terminology ............................................................................... ９

1.3 Terminology .................................................................................................... １０

1.4 Reference Documents .................................................................................... １４

1.5 Revision History .............................................................................................. １４

1.6 SOM-6869 Block Diagram .............................................................................. １５

2 COM Express Type 6 Interfaces........................................................................ １６

2.1 COM Express Type 6 Connector Layout ........................................................ １６

2.2 COM Express Type 6 Connector Pin-out ....................................................... １７

2.3 PCI Express .................................................................................................... ２５

2.3.1 COM Express A-B Connector and C-D Connector PCIe Groups ............................... ２５

2.3.2 General Purpose PCIe Signal Definitions .................................................................. ２５

2.3.3 PCI Express Lane Configurations – Per COM Express Spec .................................... ３０

2.3.4 PCI Express* General Routing Guidelines ................................................................ ３１

2.3.4.1 PCI Express Insertion Loss Budget with Slot Card ......................................... ３１

2.3.4.2 PCI Express Insertion Loss Budget with Carrier Board PCIE Device ............. ３３

2.3.4.3 PCI Express Differential Transitional Via Recommendations ......................... ３５

2.3.5 PCI Express* Trace Length Guidelines ..................................................................... ３６

2.4 PEG (PCI Express Graphics) *SOM-6869 does not support PEG. ................ ３８

2.4.1 PEG Signal Definitions .............................................................................................. ３８

2.4.2 PEG* General Routing Guidelines ............................................................................ ４４

2.4.2.1 PEG Differential Transitional Via Recommendations ..................................... ４４

2.4.3 PEG* Trace Length Guidelines ................................................................................. ４５

2.5 Digital Display Interfaces (DDI)....................................................................... ４７

2.5.1 DDI Signal Definitions ............................................................................................... ４７

2.5.2 Digital Display Interfaces (DDI) Routing Guidelines .................................................. ５５

2.5.2.1 DisplayPort Routing Guidelines ..................................................................... ５５

2.5.2.2 HDMI / DVI Routing Guidelines ...................................................................... ５７

2.5.3 HDMI / DVI Level Shifter Requirements .................................................................... ５９

2.5.4 ESD Protection ......................................................................................................... ５９

2.6 LAN Interface .................................................................................................. ６０

2.6.1 LAN Signal Definitions .............................................................................................. ６０

2.6.2 LAN Routing Guidelines ............................................................................................ ６２

２

2.6.3 LAN Trace Length Guidelines ................................................................................... ６３

2.6.4 Reference Ground Isolation and Coupling ................................................................ ６４

2.7 USB2.0 Ports .................................................................................................. ６５

2.7.1 USB2.0 Signal Definitions ......................................................................................... ６５

2.7.1.1 USB Over-Current Protection (USB_x_y_OC#) .............................................. ６８

2.7.1.2 Powering USB devices during S5 .................................................................. ６８

2.7.2 USB2.0 Routing Guidelines ...................................................................................... ６９

2.7.2.1 USB 2.0 General Design Considerations and Optimization ............................ ７０

2.7.2.2 USB 2.0 Port Power Delivery ......................................................................... ７０

2.7.2.3 USB 2.0 Common Mode Chokes ................................................................... ７１

2.7.2.4 EMI / ESD Protection ..................................................................................... ７２

2.7.3 USB2.0 Trace Length Guidelines .............................................................................. ７３

2.8 USB3.0 ........................................................................................................... ７４

2.8.1 USB3.0 Signal Definitions ......................................................................................... ７４

2.8.1.1 USB Over-Current Protection (USB_x_y_OC#) .............................................. ７７

2.8.1.2 EMI / ESD Protection ..................................................................................... ７７

2.8.2 USB3.0 Routing Guidelines ...................................................................................... ７８

2.8.2.1 USB3.0 Differential Transitional Via Recommendations ................................. ７８

2.8.3 USB3.0 Trace Length Guidelines .............................................................................. ７９

2.9 SATA .............................................................................................................. ８０

2.9.1 SATA Signal Definitions ............................................................................................ ８０

2.9.2 SATA Routing Guidelines ......................................................................................... ８２

2.9.2.1 General SATA Routing Guidelines ................................................................. ８３

2.9.2.2 SATA Differential Transitional Via Recommendations.................................... ８３

2.9.3 SATA Trace Length Guidelines ................................................................................. ８４

2.10 LVDS ............................................................................................................ ８５

2.10.1. Signal Definitions ...................................................................................................... ８５

2.10.1.1 Display Timing Configuration ....................................................................... ８８

2.10.1.2 Backlight Control .......................................................................................... ８８

2.10.2 LVDS Routing Guidelines ....................................................................................... ８９

2.10.3 LVDS Trace Length Guidelines ............................................................................... ９０

2.11 Embedded DisplayPort (eDP) * Optionally support eDP .............................. ９１

2.11.1 eDP Signal Definitions ............................................................................................ ９１

2.11.2 eDP Trace Length Guidelines ................................................................................. ９３

2.12 VGA .............................................................................................................. ９４

2.12.1 VGA Signal Definitions ............................................................................................ ９４

2.12.2 VGA Routing Guidelines ......................................................................................... ９６

2.12.2.1 RGB Analog Signals .................................................................................... ９６

３

2.12.2.2 HSYNC and VSYNC Signals ....................................................................... ９６

2.12.2.3 DDC Interface .............................................................................................. ９６

2.12.2.4 ESD Protection/EMI ..................................................................................... ９６

2.12.3 VGA Trace Length Guidelines ................................................................................. ９７

2.13 Digital Audio Interfaces ................................................................................. ９８

2.13.1 Audio Codec Signal Descriptions ............................................................................ ９８

2.13.2 Audio Routing Guidelines ........................................................................................ １００

2.13.3 Audio Trace Length Guidelines ............................................................................... １０１

2.14 LPC Bus – Low Pin Count Interface ............................................................. １０２

2.14.1 LPC Signal Definition .............................................................................................. １０２

2.14.2 LPC Routing Guidelines .......................................................................................... １０３

2.14.2.1 General Signals ........................................................................................... １０３

2.14.2.2 Bus Clock Routing ....................................................................................... １０４

2.14.3 LPC Trace Length Guidelines ................................................................................. １０４

2.15 SPI – Serial Peripheral Interface Bus ........................................................... １０５

2.15.1 SPI Signal Definition ............................................................................................... １０５

2.15.2 SPI Routing Guidelines ........................................................................................... １０７

2.15.3 SPI Trace Length Guidelines .................................................................................. １０７

2.16 General Purpose I2C Bus Interface .............................................................. １０８

2.16.1 Signal Definitions .................................................................................................... １０８

2.16.2 I2C Routing Guidelines ........................................................................................... １０９

2.16.3 I2C Trace Length Guidelines .................................................................................. １１０

2.16.4 Connectivity Considerations .................................................................................... １１０

2.17 System Management Bus (SMBus) ............................................................. １１１

2.17.1 SMB Signal Definitions............................................................................................ １１２

2.17.2 SMB Routing Guidelines ......................................................................................... １１３

2.17.3 SMB Trace Length Guidelines ................................................................................ １１３

2.18 General Purpose Serial Interface ................................................................. １１４

2.18.1 Serial interface Signal Definitions ............................................................................ １１４

2.18.2 Serial interface Routing Guidelines ......................................................................... １１５

2.18.3 Serial interface Trace Length Guidelines ................................................................ １１５

2.19 CAN Interface * Optionally support CAN ................................................... １１６

2.19.1 CAN interface Signal Definitions ............................................................................. １１６

2.19.2 CAN interface Routing Guidelines ........................................................................... １１６

2.19.3 CAN interface Trace Length Guidelines .................................................................. １１７

2.20 Miscellaneous Signals .................................................................................. １１８

2.20.1 Miscellaneous Signals ............................................................................................ １１８

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