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3.3.15 Digital Display Interface #3 Connector
As mentioned in the previous paragraph, COM Express specifications Rel.2.1 for Type 6 pinout define three Digital Display interfaces (DDI).
Digital Display Interface #3 connector - CN32
Pin
Signal
Pin
1
DDI3_PAIR0+
3
DDI3_PAIR0-
5
GND
7
DDI3_PAIR2+
9
DDI3_PAIR2-
11
GND
13
DDI3_DDC_AUX_SEL
15
DDI3_CTRLCLK_AUX+
17
DDI3_CTRLDATA_AUX-
19
GND
DDI3_CTRLCLK_AUX+/DDI3_CTRLDATA_AUX-: DDI Interface #3, Auxiliary channel for Display Port (differential pair) or DDC Clock and Data Line for TMDS.
DDI3_HPD: DDI Interface #3 Hot Plug Detect
DDI3_DDC_AUX_SEL: DDI Interface #3 Cable Adapter Detect signal. When this signal is detected high, then on the connector there is the TMDS interface (it
means that a DP-to-HDMI adapter is connected).
CCOMe-965
CCOMe-965 - Rev. First Edition: 1.0 - Last Edition: 3.0 - Author: S.B. - Reviewed by G.G. Copyright © 2016 SECO S.r.l.
Signal
2
GND
4
DDI3_PAIR1+
6
DDI3_PAIR1-
8
GND
10
DDI3_PAIR3+
12
DDI3_PAIR3-
14
GND
16
GND
18
DDI3_HPD
20
+3.3V_DDI3
While first two Digital Display interfaces are switched on two
different connectors, third Digital Display Interface is carried out
directly on a standard DisplayPort Connector, CN32, type
WINNING p/n WDPE-20F5L1BU3 or equivalent, with the pinout
shown in the following table.
This connector can be used directly as a Multi-Mode Display Port connector, i.e. it can be
used also for HDMI/DVI devices by using passive external adapters.
DDI3_PAIR0+/DDI3_PAIR0-: DDI Interface #3 Differential Pair #0. Can be used as Display Port
differential pair #0 or TMDS (HDMI) differential pair #2.
DDI3_PAIR1+/DDI3_PAIR1-: DDI Interface #3 Differential Pair #1. Can be used as Display Port
differential pair #1 or TMDS (HDMI) differential pair #1.
DDI3_PAIR2+/DDI3_PAIR2-: DDI Interface #3 Differential Pair #2. Can be used as Display Port
differential pair #2 or TMDS (HDMI) differential pair #0.
DDI3_PAIR3+/DDI3_PAIR3-: DDI Interface #3 Differential Pair #3. Can be used as Display Port
differential pair #3 or TMDS (HDMI) Clock differential pair.
45
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