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COM Express Interfaces

2.5. Digital Display Interfaces

Module Types 6 and 10 use Digital Display Interfaces (DDI) to provide DisplayPort, HDMI/DVI,

and SDVO interfaces. Type 10 Modules can contain a single DDI (DDI[0]) that can support

DisplayPort, HDMI/DVI, and SDVO. Type 6 Modules can contain up to 3 DDIs (DDI[1:3]) of

which DDI[1:3] can support DisplayPort, HDMI/DVI and DDI[1] can support DisplayPort,

HDMI/DVI, and SDVO. The main difference is that SDVO is only supported on DDI[0] for Type

10 Modules and DDI[1] for Type 6 Modules.

Module Type 2 offers additionally the possibility to have SDVO shared with PEG.

2.5.1. DisplayPort / HDMI / DVI

DisplayPort was developed by the Video Electronics Standard Association (VESA) in order to

create a new digital display port interface to connect a video source to a display device.

DisplayPort can be used to transfer audio and video at the same time, but each one is optional

and can be transmitted without the other. A bi-directional, half-duplex auxiliary channel carries

device management and device control data for the Main Link, such as VESA EDID.

DisplayPort is nowadays on almost all COM Express Modules available as Dual-mode

DisplayPort, that can directly emit single-link HDMI and DVI signals using an adapter, which

contains a level shifter to adjust for the lower voltages required by DisplayPort. These adapters

can be directly implemented on the Carrier Board to have an easy, simple and future proof

implementation of HDMI and/or DVI or an inexpensive cable adapter can be directly connected

on the Carrier Board's DisplayPort connector.

2.5.1.1. Signal Definitions

Type 10 offers up to one DisplayPort interface and Type 6 Modules up to 3 DisplayPort

interfaces. Both implementations are very similar, so only one reference schematic is necessary

to show Carrier Board implementation.

Each DisplayPort interface consists of 4 differential lanes, 1 auxiliary lane and 1 hot-plug-detect

signal. The DDC_AUX_SEL pin should be routed to pin 13 of the DisplayPort connector, to

enable Dual-Mode. When HDMI/DVI is directly done on the Carrier Board, this pin shall be

pulled to 3.3V with a 100k Ohm resistor to configure the AUX pairs as DDC channels.

Table 11: Display Port / HDMI / DVI Pin-out of Type 10 and Type 6

COM Express

Pin Name

DDI0

Type 10

DDI1

Type 6

DDI2

Type 6

DDI3

Type 6

Function (DDIX)

DisplayPort

Function (DDIX)

HDMI / DVI

DDIX_PAIR0+ B71 D26 D39 C39 DPX_LANE0+ TMDSX_DATA2+

DDIX_PAIR0- B72 D27 D40 C40 DPX_LANE0- TMDSX_DATA2-

DDIX_PAIR1+ B73 D29 D42 C42 DPX_LANE1+ TMDSX_DATA1+

DDIX_PAIR1- B74 D30 D43 C43 DPX_LANE1- TMDSX_DATA1-

DDIX_PAIR2+ B75 D32 D46 C46 DPX_LANE2+ TMDSX_DATA0+

DDIX_PAIR2- B76 D33 D47 C47 DPX_LANE2- TMDSX_DATA0-

DDIX_PAIR3+ B81 D36 D49 C49 DPX_LANE3+ TMDSX_CLK+

DDIX_PAIR3- B82 D37 D50 C50 DPX_LANE3- TMDSX_CLK-

DDIX_HPD B89 C24 D44 C44 DPX_HPD HDMIX_HPD

DDIX_CTRLCLK_AUX+ B98 D15 C32 C36 DPX_AUX+ HDMIX_CTRLCLK

DDIX_CTRLDATA_AUX- B99 D16 C33 C37 DPX_AUX- HDMIX_CTRLDATA

DDIX_DDC_AUX_SEL B95 D34 C34 C38

Note: Please verify in the Module's specification if DisplayPort or Dual-Mode

DisplayPort is supported.

PICMG

COM Express

Carrier Board Design Guide Rev. 2.0 / December 6, 2013

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