TX2 GPIO table

Autonomous Machines Jetson & Embedded Systems Jetson TX2
1

In our design, we don’t use these pins, and only leave test pad without any external pull up/down resistors.
H10(UART3_TX)/H9(UART3_RX)/G10(UART3_RTS#)/G9(UART3_CTS#)

What kind of Pinmux settings we should use to prevent from wrong setting and floating? Please help review our below settings, thanks

H10(UART3_TX) Customer Usage = unused_UART4_TX , pin direction = Not Assigned ,Req. Initial State= empty
H9(UART3_RX) Customer Usage = unused_UART4_RX, pin direction = Not Assigned ,Req. Initial State=empty
G10(UART3_RTS#) Customer Usage = unused_UART4_RTS,pin direction =Not Assigned ,Req. Initial State=empty
G9(UART3_CTS#) Customer Usage = unused_UART4_CTS, pin direction =Not Assigned ,Req. Initial State=empty

2

hello sandra_lin,

please check the development guide about pinmux and gpio configure.
please refer to [R28.1 Development Guide]-> [U-Boot Customization]-> [TX2 Configuring Pinmux GPIO and PAD]
thanks

3

Based on Jetson-TX2-Generic-Customer-Pinmux-Template.xlsm to create dtsi file.
if we let UART3_TX(H10)
“Customer Usage” set to “unused_UART4_TX”
“Pin direction” set to “Not Assigned”

Then “Req. Initial State” need to set to “Z” or “N/A”?

4

Hello Jerry,
In addition to last question , i add more questions need NV to help, thanks

Based on Jetson-TX2-Generic-Customer-Pinmux-Template.xlsm to create dtsi file.
if we let UART3_TX(H10)
“Customer Usage” set to “unused_UART4_TX”
“Pin direction” set to “Not Assigned”

(1)Then “Req. Initial State” need to be set to “Z” or “N/A” in this excel file?
or just leave this space as blank in excel file?

(2)The created dtsi file will be the same if we set “Req. Initial State” to “Z” or “N/A” ?

(3)If one pin is set to “Customer Usage” = “unused_XXXXXXX”, “Pin direction” = “Not Assigned”.
Then what is the pin real direction? How do we to set this pin to prevent from floating?

Thanks
BR,
Joseph

5

Hello Jerry,
Do you have any suggestion and update?

Thanks,
BR,
Joseph

6

Hello Jerry,
Do you have any suggestion and update about my question?

Thanks,
BR,
Joseph

7

hello joseph1_yang,

sorry for the late reply,
for unused pin, just set “Customer Usage” = “unused_XXXXXXX”, “Pin direction” = “Not Assigned”, then this pin will not be included in pinmux .dtsi file.
thanks

8

Hello Jerry,
Thank for your response and one more question:

In our current HW circuit design,
there is NO any external PU/PD resisters on DP0_HPD/HDMI_CEC/DP1_HPD, and we don’t use these 3 function pins,
and we follow JetsonTX2_OEM_Product_DesignGuide.pdf Table 87. Unused MPIO pins / Pin Groups,
to let these 3 pins unconnected.

What should we set in Jetson-TX2-Generic-Customer-Pinmux-Template.xlsm
to prevent from floating and make false interrupt into CPU?
Please give us suggestion, thanks

[Pinmux default setting]
Signal Name/ Customer Usage / Pin Direction/ Req. Initial State/ Wake Pin
DP0_HPD, DP_AUX_CH0_HPD , Input, , empty, YES
HDMI_CEC, HDMI_CEC , Bidirectional , empty, YES
DP1_HPD, DP_AUX_CH1_HPD , Input , empty, YES

BR,
Joseph

9

Replied at https://devtalk.nvidia.com/default/topic/1025116/jetson-tx2/jetson-tx2-generic-customer-pinmux-template-xlsm-question/post/5215178/#5215178