Kontron COMe Starterkit Eval T2 - Manual (Page 67)

COM Express Interfaces
The MXM3 Module shown in this example supports two DisplayPort channels. They are
designated DP1 and DP3 on the schematic. The DP1 reference schematic has Dual Mode
support which switches the AUX channel from a differential pair for Display Port to an I2C
compatible interface for DVI/HDMI. FETs are provided to switch in pull-up resistors required for
the I2C interface as well as removal of the blocking capacitors. The DP1 schematic should be
replicated for DP3 as required.
The reference design does not support the discrete panel and backlight control signals found on
the MXM connector pins 23 (PNL_PWR_EN), 25 (PNL_BL_PWM), and 27 (PNL_BL_PWM).
The design relies on panel support for these interfaces via the AUX channel.
PICMG ® COM Express ® Carrier Board Design Guide Rev. 2.0 / December 6, 2013
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