SBC-C41-pITX
SBC-C41-pITX User Manual - Rev. First Edition: 1.0 - Last Edition: 1.1 - Author: A.R./S.B. - Reviewed by M.B. Copyright © 2021 SECO S.p.A.
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As a factory alternative, it is possible to have two video outputs, i.e. a
standard HDMI interface and a multimode Display Port Interface.
In this latest case, these interfaces will be available on a combo HDMI
+ DP++ connector, CN21, type Freeport p/n 62EHDS-30AN0-P1-D.
DDI Interface #0 will be available on the HDMI connector, while DDI
interface #1 will be available on the DP++ connector (see image on
the left).
Signals involved in HDMI and DP++ management are the following:
T/TMDS_CLK-: TMDS differential Clock.
TMD/TMDS_LANE0-: TMDS differential pair #0
TMD/TMDS_LANE1-: TMDS differential pair #1
TMD/TMDS_LANE2-: TMDS differential pair #2
SDA: DDC Data line for HDMI panel. Bidirectional signal, electrical level +5V
HDMI
pull-up resistor.
SCL: DDC Clock line for HDMI panel. Output signal, electrical level +5V
HDMI
-up
resistor.
HDMI_CEC: HDMI Consumer Electronics Control (CEC) Line. Bidirectional signal, electrical level
+3.3V_ALW
-up resistor.
HPD: HDMI Hot Plug Detect Input signal.
D/DP_LANE0-: Display Port differential data pair #0
D/DP_LANE1-: Display Port differential data pair #1
D/DP_LANE3-: Display Port differential data pair #2
D/DP_LANE4-: Display Port differential data pair #4
DP_/DP_DAT_AUX-: Display Port auxiliary channel differential data pair / DDC Clock
and Data Line for HDMI panels. See CAD signal description.
DP_CEC: DP Consumer Electronics Control (CEC) Line. Bidirectional signal, electrical level
+3.3V_ALW
-up resistor.
DP_HPD: DP Hot Plug Detect Input signal. +3.3V_RUN
-down resistor
CAD: This signal is used to automatically configure DP or HDMI interface on DP++ connector. When a DP cable is connected, then the CAD signal remains floating.
The internal circuitry will recognize this configuration, making available the Display Port Auxiliary channel signals on pins B15/B17. Instead, when a DP-to-HDMI
adapter is connected, it will drive opportunely the CAD signal, making available HDMI_CTRL_CLK and HDMI_CTRL_DAT signals on the previous pins.
HDMI+DP++ Connector - CN21 (factory alternative)
Pin Signal
Pin Signal
A1
TMD
A2
GND
A3
TMDS_LANE2-
A4
TMD
A5
GND
A6
TMDS_LANE1-
A7
TMD
A8
GND
A9
TMDS_LANE0-
A10 T
A11 GND
A12 TMDS_CLK-
A13 HDMI_CEC
A14 ---
A15 SCL
A16 SDA
A17 GND
A18 +5V
HDMI
A19 HPD
B1
D
B2
GND
B3
DP_LANE0-
B4
D
B5
GND
B6
DP_LANE1-
B7
D
B8
GND
B9
DP_LANE2-
B10 D
B11 GND
B12 DP_LANE3-
B13 CAD
B14 DP_CEC
B15 DP_
B16 GND
B17 DP_DAT_AUX-
B18 DP_HPD
B19 GND
B20 DP_PWR