Kontron COMe Starterkit Eval T2 - Manual (Page 3)

Contents
1. Preface..................................................................................................................................8
1.1. About This Document...........................................................................................................8
1.2. Intended Audience................................................................................................................8
1.3. No special word usage.........................................................................................................8
1.4. No statements of compliance..............................................................................................8
1.5. Correctness Disclaimer........................................................................................................8
1.6. Name and logo usage...........................................................................................................9
1.7. Intellectual property............................................................................................................10
1.8. Acronyms, Abbreviations and Definitions Used...............................................................11
1.9. Signal Table Terminology...................................................................................................14
1.10. Schematic Conventions......................................................................................................15
2. COM Express Interfaces....................................................................................................16
2.1. COM Express Signals.........................................................................................................16
2.1.1. Connector Pin-out Comparison.......................................................................................20
2.2. PCIe General Introduction..................................................................................................30
2.2.1. COM Express A-B Connector and C-D Connector PCIe Groups....................................30
2.3. General Purpose PCIe Lanes.............................................................................................31
2.3.1. General Purpose PCIe Signal Definitions.......................................................................31
2.3.2. PCI Express Lane Configurations – Per COM Express Spec.........................................32
2.3.3. PCI Express Lane Configurations – Module and Chipset Dependencies.......................32
2.3.4. Device Up / Device Down and PCIe Rx / Tx Coupling Capacitors..................................33
2.3.5. Schematic Examples.......................................................................................................34
2.3.6. PCI Express Routing Considerations..............................................................................47
2.4. PEG (PCI Express Graphics)..............................................................................................48
2.4.1. Signal Definitions.............................................................................................................48
2.4.2. PEG Configuration...........................................................................................................49
2.4.3. Reference Schematics.....................................................................................................52
2.4.4. Routing Considerations...................................................................................................53
2.5. Digital Display Interfaces....................................................................................................55
2.5.1. DisplayPort / HDMI / DVI ................................................................................................55
2.5.2. SDVO...............................................................................................................................61
2.6. Mobile PCI Express Module (MXM)....................................................................................66
2.6.1. Signal Definitions.............................................................................................................66
2.6.2. Reference Schematics.....................................................................................................68
2.6.3. Routing Considerations...................................................................................................69
2.7. LAN....................................................................................................................................... 70
2.7.1. Signal Definitions.............................................................................................................70
2.7.2. Reference Schematics.....................................................................................................73
2.7.3. Routing Considerations...................................................................................................75
2.8. USB Ports............................................................................................................................ 76
2.8.1. Signal Definitions.............................................................................................................76
2.8.2. Reference Schematics.....................................................................................................77
2.8.3. Avoiding Back-driving Problems......................................................................................80
PICMG ® COM Express ® Carrier Board Design Guide Rev. 2.0 / December 6, 2013
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