COM Express® Carrier Board Design Guide
17
Figure 8: DVI Example (3)
2.3.1.2 Routing Considerations
For the DisplayPort interconnection between the COM Express Module and the DisplayPort
connector or the level shifter, refer to the COM Express Carrier Design Guide, Rev. 2.0 /
December 6, 2013, Section 6.5.6 'DisplayPort Trace Routing Guidelines' on page 186 for
details.
The DVI and HDMI interface are based on the differential signaling method TMDS. The TDMS
differential signals between the level shifter and the DVI connector have to be routed in pairs
with a differential impedance of 100Ω. The length of the differential signals must be kept
close. The maximum length difference must be within 100mils for any of the pairs relative to
each other. Pair to pair spacing be over 2x the trace width to reduce trace-to-trace couplings.
Having wider gaps between differential pair DVI traces will reduce noise coupling. Ground
should not be placed adjacent to the DVI traces on the same layer. There should be at least
30mils between the DVI trace and any ground on the same layer.
Summary of Contents for ET976
Page 1: ...COM EXPRESS CARRIER BOARD DESIGN GUIDE Version 1 0 January 2022...
Page 11: ...COM Express Carrier Board Design Guide 5 Figure 3 PCI Express x4 Slot Example...
Page 12: ...6 COM Express Carrier Board Design Guide Figure 4 PCIe Mini Card Reference Circuitry...
Page 19: ...COM Express Carrier Board Design Guide 13 Figure 7 HDMI Example 1...
Page 20: ...14 COM Express Carrier Board Design Guide Figure 7 HDMI Example 2...
Page 21: ...COM Express Carrier Board Design Guide 15 Figure 8 DVI Example 1...
Page 22: ...16 COM Express Carrier Board Design Guide Figure 8 DVI Example 2...
Page 31: ...COM Express Carrier Board Design Guide 25 Figure 12 USB 3 0 Example 2...
Page 37: ...COM Express Carrier Board Design Guide 31 Figure 14 LVDS Reference Schematic 2...
Page 44: ...38 COM Express Carrier Board Design Guide Figure 16 VGA Reference Schematics 2...
Page 48: ...42 COM Express Carrier Board Design Guide Figure 18 HDA Example Schematic 2...
Page 52: ...46 COM Express Carrier Board Design Guide Figure 19 LPC Super I O Example 2...
Page 61: ...COM Express Carrier Board Design Guide 55 Figure 24 General Purpose Serial Port Example 2...
Page 70: ...64 COM Express Carrier Board Design Guide Figure 28 PWRBTN and SYS_RESET Circuitry...
Page 84: ...78 COM Express Carrier Board Design Guide Chapter 4 Carrier Board PCB Layout Guidelines...
