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CN75 position HDMI / DP#1 selector
1-2
HDMI
2-3
DP#1
Multimode DP#1 Connector
Pin
Signal
Pin
1
DDI1_PAIR0+
3
DDI1_PAIR0-
5
GND
7
DDI1_PAIR2+
9
DDI1_PAIR2-
10
11
GND
12
13
DDI1_DDC_AUX_SEL
14
15
DDI1_CTRLCLK_AUX+
16
17
DDI1_CTRLDATA_AUX-
18
19
GND
20
for Display Port (differential pair) or DDC Clock and Data Line for TMDS
DDI1_HPD: DDI Interface #1 Hot Plug Detect. This signal is tied to GND through a
DDI1_DDC_AUX_SEL: DDI Interface #1 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). This signal is tied to GND through a 1MOhm resistor. Please refer to CN76 jumper for detailed description.
DDI1_CEC: this signal is tied to GND through a 5.1MOhm resistor
DD1_PWR: Power voltage reference for DisplayPort, directly derived from +3.3V_RUN through a current limited power switch
To redirect signals coming from card edge connector to this DP1++ connector, there is an onboard high-speed multiplexer, driven by 2-way jumper CN75,
described above, that must be placed in 2-3 position. When selected, it is possible to configure this multimode display port to work in standard mode condition,
i.e. can be either used as DP interface or HDMI with the use of external DP++ to HDMI dongle, or fixed HDMI or DP mode condition. This can be set with the 4-
way jumper CN76 described below.
CSM-B79
CSM-B79 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.1 - Author: A.R - Reviewed by S.R. - Copyright © 2021 SECO S.p.A.
In order to match the CSM-B79 Carrier Board with the secondary display interfaces effectively
available on the SMARC
which is a standard pin header, P2.54mm, 1x3 pin.
In order to support HDMI configuration, the jumper must be placed in 1-2 position.
According to SMARC
CN11
secondary display interface from card edge connector, on same pins
Signal
that can be used for HDMI, is the connection to one right-angle standard
DisplayPort Connector CN11, supporting DP++, type WINNING p/n
2
GND
WDPE-20F3L1BU3 or equivalent, with the pinout shown in the left table.
4
DDI1_PAIR1+
Signal Description:
6
DDI1_PAIR1-
DDI1_PAIR0+/DDI1_PAIR0-: SMARC
8
GND
Display Port differential pair #0 or TMDS (HDMI) differential pair #2
DDI1_PAIR3+
DDI1_PAIR1+/DDI1_PAIR1-: SMARC
DDI1_PAIR3-
Display Port differential pair #1 or TMDS (HDMI) differential pair #1
DDI1_CEC
DDI1_PAIR2+/DDI1_PAIR2-: SMARC
Display Port differential pair #2 or TMDS (HDMI) differential pair #0
GND
DDI1_PAIR3+/DDI1_PAIR3-: SMARC
DDI1_HPD
Display Port differential pair #3 or TMDS (HDMI) Clock differential pair
DD1_PWR
DDI1_CTRLCLK_AUX+/DDI1_CTRLDATA_AUX-: SMARC
®
module, it is necessary to configure properly dedicated jumper CN75,
®
Rel 2.1.1 specification, the other support on
®
module DDI Interface #1 Differential Pair #0. Can be used as
®
module DDI Interface #1 Differential Pair #1. Can be used as
®
module DDI Interface #1 Differential Pair #2. Can be used as
®
module DDI Interface #1 Differential Pair #3. Can be used as
resistor
®
module DDI Interface #1, Auxiliary channel
42
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