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SMARC T335x Carrier Board Hardware Design Guide, Document Revision 1.2
Direction
Type / Tolerance
Notes
LVDS LCD
LVDS signaling used for LVDS LCD displays
USB
DC coupled differential signaling used for
traditional (non- Super-Speed) USB signals
USB SS
LVDS signaling used for Super Speed USB 3.0
USB VBUS 5V
5V tolerant input for USB VBUS detection
10/100Base-TX
Differential signaling, using MLT-3 (tri level) format
for 100 MBit / Sec full duplex Ethernet
REF
Reference voltage output. May be sourced from a
Module power plane.
PDS
Pull-down strap. A Module output pin that is either
tied to GND or is not connected. Used to signal
Module capabilities (pin-out type) to the Carrier
Board.
P
Power input/output
Schematic examples are drawn with signal directions shown per the figure
below. Nets that connect to the
SMARC
Module are named per the
SGET
SMARC
specification.
Figure 1: Schematic Conventions