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Q7-A75-J
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Q7-A75-J User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: S.B. - Reviewed by P.Z. - Copyright © 2016 SECO S.r.l.
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3.2.1.8
HDMI interface signals
Besides LVDS interface, NXP i.MX6 processor also has an embedded HDMI Tx module, which provides a HDMI standard interface for HDMI1.4a compliant
displays.
Signals involved in HDMI management are the following:
T/TMDS_CLK-: TMDS differential Clock.
T/TMDS_TX0-: TMDS differential pair #0
T/TMDS_TX1-: TMDS differential pair #1
T/TMDS_TX2-: TMDS differential pair #2
HDMI_CTRL_DAT: DDC Data line for HDMI panel. Bidirectional signal, electrical level +3P3V_S with a 4k7
Ω
pull-up resistor.
HDMI_CTRL_CLK: DDC Clock line for HDMI panel. Bidirectional signal, electrical level +3P3V_S with a 4k7
Ω
pull-up resistor. Please be aware that this signal can
also be used differently, please check the pin-muxing table.
HDMI_CEC: HDMI Consumer Electronics Control (CEC) Line. Bidirectional signal, electrical level +3.3V_S. Please be aware that this signal can also be used
differently, please check the pin-muxing table.
HDMI_HPD#: Hot Plug Detect Input signal. +3.3V_S electrical level signal with 100k
Ω
pull-down resistor
Since HDMI Tx module is embedded in the i.MX6 processors it is not necessary to implement voltage level shifter for TMDS differential pairs on the Carrier board. It
is still necessary, however, to implement voltage level shifters on Control data/Clock signals, as well as for Hot Plug Detect signal.
3.2.1.9
SPI interface signals
i.MX6 processors offer up to four Enhanced Configurable Serial Peripheral Interfaces (eCSPIS), which can be used for connection of EEPROMs and Serial Flash
devices, which can also be used for serial boot.
SPI interface can support speed up to 20MHz.
Signals involved with SPI management are the following (they are supported by i.MX6 processor
’
s ECSPI2 controller):
SPI_MOSI: SPI Master Out Slave In, Output from Qseven
®
module to SPI devices embedded on the Carrier Board.
SPI_MISO: SPI Master In Slave Out, Input to Qseven
®
module from SPI devices embedded on the Carrier Board.
SPI_CLK: SPI Clock Output to carrier board
’
s SPI embedded devices.
SPI_CS0#: SPI primary Chip select, active low output signal.
SPI_CS1#: SPI secondary Chip select, active low output signal. This signal must be used only in case there are two SPI devices on the carrier board, and the first
chip select signal (SPI_CS0#) has already been used. It must not be used in case there is only one SPI device.
All of the above mentioned signals can also be used for different functionalities, please refer to the pin muxing table for more details.
