Nvidia Jetson AGX Xavier Series User Manual

Jetson AGX Xavier Series Product DG-09840-001_v2.5 | 123
Chapter 16. Pads
16.1 MPIO Pad Behavior when Associated
Power Rail is Enabled
Jetson AGX Xavier CZ (see note) type MPIOs pins may glitch when the associated power rail is
enabled or disabled. Designers should take this into account. MPIOs of this type that must
maintain a low state even while the power rail is being ramped up or down may require special
handling. The “Pin Descriptions” section of
Jetson AGX Xavier Data Sheet includes the pin type
information.
16.2 Schmitt Trigger Usage
The MPIO pins have an option to enable or disable Schmitt Trigger mode on a per-pin basis.
This mode is recommended for pins used for edge-sensitive functions such as input clocks, or
other functions where each edge detected will affect the operation of a device. Schmitt Trigger
mode provides better noise immunity and can help avoid extra edges from being “seen” by the
SoC inputs. Input clocks include the I2S and SPI clocks when SoC is in slave mode. The
FAN_TACH pin is another input that could be affected by noise on the signal edges. The
SDCARD_CLK pin, while used to output the SD clock, also samples the clock at the input to
help with read timing. Therefore, the pin may benefit from enabling Schmitt Trigger mode.
Care should be taken if the Schmitt Trigger mode setting is changed from the default
initialization mode as this can have an effect on interface timing.
16.3 Pins Pulled and Driven During
Power-on
Jetson AGX Xavier is powered up before the carrier board (See Power Sequencing section).
Some of the pins are pulled or driven high either by The SoC or by pull-up resistors on the
module. The pins on Jetson AGX Xavier that are pulled/driven high by The SoC can be found in
the Module Pinmux spreadsheet. The pins that have pull-up resistors on the module are listed
in the Jetson AGX Xavier Signal Terminations section of the Design Checklist chapter. Care
must be taken on the carrier board design to ensure that any of these pins that connect to

Nvidia Jetson AGX Xavier Series Specifications

General

Brand	Nvidia
Model	Jetson AGX Xavier Series
Category	Computer Hardware
Language	English