# Using the Generic Timestamp Engine

**URL:** <https://forums.developer.nvidia.com/t/using-the-generic-timestamp-engine/140280>\
**Category:** Jetson AGX Xavier\
**Tags:** gpio\
**Created:** [July 3, 2020, 2:37pm UTC](https://forums.developer.nvidia.com/t/using-the-generic-timestamp-engine/140280 "2020-07-03T14:37:53Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![diego.chaverri](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/diego.chaverri/32/15649_2.png) [@diego.chaverri](https://forums.developer.nvidia.com/u/diego.chaverri)\
**Post date:** [July 3, 2020, 2:37pm UTC](https://forums.developer.nvidia.com/t/using-the-generic-timestamp-engine/140280/1 "2020-07-03T14:37:53Z")

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Hi,

I’ve been checking about the Generic Timestamp Engine, I’m interested on using it on the Jetson Xavier AGX.

[Generic Timestamp Engine](https://docs.nvidia.com/jetson/l4t/index.html#page/Tegra%20Linux%20Driver%20Package%20Development%20Guide/generic_timestamp_engine.html)

Is there a restriction on the number of GPIO’s / IRQs that can be assigned to the GTE for timestamp loggin?

Thanks

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**Author:** ![JerryChang](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/jerrychang/32/14043_2.png) [@JerryChang](https://forums.developer.nvidia.com/u/JerryChang)\
**Post date:** [July 6, 2020, 6:50am UTC](https://forums.developer.nvidia.com/t/using-the-generic-timestamp-engine/140280/3 "2020-07-06T06:50:27Z")

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hello diego.chaverri,

you should only using GPIO pins under AON category to feed pps signals, then you should connect your hardware on the pin for using;  
please also refer to [Topic 124003](https://forums.developer.nvidia.com/t/jetson-xavier-hardware-pps-out/124003/16) for using pps-gpio driver.  
thanks

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**Author:** ![TomNVIDIA](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/tomnvidia/32/14181_2.png) [@TomNVIDIA](https://forums.developer.nvidia.com/u/TomNVIDIA)\
**Post date:** [October 18, 2021, 6:22pm UTC](https://forums.developer.nvidia.com/t/using-the-generic-timestamp-engine/140280/5 "2021-10-18T18:22:12Z")

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