Seco Qseven Q7-974 User Manual page 39

Rel. 2.0 comliant module with the intel bay trail family system-on-chips

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3.2.3.11

DP interface signals

As told in the previous paragraph, the Intel

Digital Display Interface #0, in particular, is used to implemented HDMI or Multimode Display Port interface.

Please be aware that this interface is a multimode Display Port: this means that it is possible to use it directly for the connection of Display Port compatible monitors

or converted to HDMI/DVI interface on the carrier board or on the external connector (by using an adapter)

If the board purchased is in DP configuration, then the following signals will be available on Qseven

DP_LANE3+/DP_LANE3-: Display Port differential pair #3.

DP_LANE2+/DP_LANE2-: Display Port differential pair #2.

DP_LANE1+/DP_LANE1-: Display Port differential pair #1

DP_LANE0+/DP_LANE0-: Display Port differential pair #0

DP_AUX+/DP_AUX-: Display Port auxiliary channel differential pair.

HDMI_HPD#: Hot Plug Detect Input signal. +3.3V_S electrical level signal, active low with 100kΩ pull-up resistor. Please consider that Display Port specifications

assume that the Hot Plug signal is active high. On the carrier board, therefore, it is necessary to invert the signal to ensure the working of Display Port interface.

DP_HPD#. DisplayPort Hot Plug Detect Input signal. +3.3V_S electrical level signal, active low with 100kΩ pull-up resistor. This signal was present on Qseven

specifications until rev. 1.2, while it has been deleted with Qseven specifications rev. 2.0, since the Hot Plug signal for Display Port had been merged with the HPD

signal for HDMI. Qseven

specification Errata Sheet for version 2.0, published by SGET consortium, reintroduced this signal for compatibility with Qseven

modules Rel 1.2 compliant. On Q7-974 module, this signal is electrically tied to DPHDMI_HPD#.

The following signals, used only for HDMI interface, are also available, for a correct implementation, on the Carrier Board, of a multi-mode Display Port connection.

HDMI_CTRL_DAT: DDC Data line for HDMI panel. Bidirectional signal, electrical level +3.3V_S with a 2k2Ω pull-up resistor. Also used as a strap signal for the Q7-

974 module (please check par. 3.2.4 for further details).

HDMI_CTRL_CLK: DDC Clock line for HDMI panel. Bidirectional signal, electrical level +3.3V_S with a 2k2Ω pull-up resistor.

HDMI_CEC: HDMI Consumer Electronics Control (CEC) Line. Bidirectional signal, electrical level +3.3V_S. According to Qseven

reality, a General Purpose 1_wire bus interface, that can be used for implementation of HDMI_CEC. Real usage of this signal depends on Q7-974 dedicated API

libraries.

Please refer to the following schematics as an example of implementation of multimode DisplayPort connection on the carrier board, which will allow the use of

external adapters for the conversion to HDMI/DVI.

Q7-974

Atom E38xx family of SOCs offer two Digital Display Interfaces, configurable to work in HDMI/DVI/DP/eDP modes.

golden finger connector:

specifications, the signal is, in

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