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4.2.1 DP++ working mode
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If the Qseven
module used with CQ7-A30 carrier board offers support for DP/DP++ displays, then it is necessary to plug the adapter module in DP++/HDMI slot
using the adapter's dedicated edge connector CN3.
DP++ connector - CN4
Pin
Signal
1
DP_LANE0+
3
DP_LANE0-
5
GND
7
DP_LANE2+
9
DP_LANE2-
11
GND
13
CAD
15
HDMI_CTRL_CLK / DP_AUX+
17
HDMI_CTRL_DAT / DP_AUX-
19
GND
DP_LANE1+/DP_LANE1-: Display Port differential pair #1.
DP_LANE2+/DP_LANE2-: Display Port differential pair #2.
DP_LANE3+/DP_LANE3-: Display Port differential pair #3.
DP_HPD: Hot Plug Detect Input signal.
HDMI_CEC: HDMI Consumer Electronics Control (CEC) Line. This signal is used only for HDMI compatibility when a HDMI adapter is connected to the DP
connector. According to Qseven
HDMI_CEC. In case the Qseven
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Furthermore, this signal will be available on the DP++/HDMI card edge connector only in case that jumper JP5 on the carrier board is placed in position 2-3 (please
check par. 3.3.3). Please refer to the User Guide of the Qseven
For ESD protection, on all signal lines are placed clamping diodes for voltage transient suppression.
CQ7-A30
CQ7-A30 - Rev. First Edition: 1.0 - Last Edition: 2.0 - Author: S.B. - Reviewed by G.G. Copyright © 2016 SECO S.r.l.
Pin
Signal
2
GND
4
DP_LANE1+
6
DP_LANE1-
8
GND
10
DP_LANE3+
12
DP_LANE3-
14
HDMI_CEC
16
GND
18
DP_HPD
20
+3.3V
DP
®
specifications, the signal is, in reality, a General Purpose 1_wire bus interface, that can be used for implementation of
module used doesn't support the HDMI_CEC functionality, then this signal could be not available or have a different utilisation.
®
module used for more information on the allowed uses of this signal.
In this case, only the module's connector CN4 will be usable, which is a standard DP
connector, type WinWin p/n WDPE-20F3L1BU3 or equivalent,
with the pinout shown in the table on the left.
Such a pinout allows the implementation of a DP++ interface,
i.e. an interface able to support both DP and HDMI/DVI
displays (by using dedicated adapters). Please remember that
this feature is possible only in the case the Qseven
In case that DP++ is supported, when a DP cable is connected, then this interface will
recognize it, and on pins 15/17 there will be the Display Port Auxiliary channel signals.
Instead, when a DP-to-HDMI adapter is mounted, it will drive opportunely the CAD signal,
which will make available HDMI_CTRL_CLK and HDMI_CTRL_DAT signals on the same
pins.
Further signals involved in DP management are the following (please check the Qseven
connector's description table for a correspondence between DP lanes and TMDS lanes):
DP_LANE0+/DP_LANE0-: Display Port differential pair #0.
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module used supports it.
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74
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