AGX Xavier Single Node Nets

[ian.draney]

Hi Nvidia Forums!

I’m interested in designing a custom carrier board with an AGX Xavier. I also want to design it so that it is forward compatible with the AGX Orin. The purpose is specifically for PCIe, where there will be three 4-lane buses. My questions are as follows.

1. Single Node Network (SNN): Is it possible to use the AGX Xavier pins connected to the SNN nets for high-speed differential signals (PCIe), or are these pins just dead ends?

2. PCIe block partitioning: Is it possible to operate two separate x4 PCIe buses within a single x8 PCIE block? (e.g., via Pinmux and Device Tree customization)

3. AGX Orin USB 3.x, PCIe, UFS, and MGBE Mapping Options: Are the AGX Orin configurations limited to only the stated three options in the image above, or can they be further customized?

Thanks!
Ian

[WayneWWW]

For question 2, it is not possible.

For question 3, actually the info is out of date. Only the first 2 configurations are supported. The 3rd one is not. Please let us know where did you get this info. It requires correction.

[ian.draney]

Hi @WayneWWW ,

Thank you for responding. It appears that I was using an outdated version of the Jetson AGX Orin Series and Jetson AGX Xavier Series Interface Comparison and Migration (DA-10655-001_v1.1 | March 2022). I see that there are only 2 configurations listed in the newer version (DA-10655-001_v1.2 | June 2022). Your answers for questions 2 and 3 are very clear.

Do you have an answer for question 1? Are the NVHS1 pins connected to the SNN nets usable on AGX Xavier?

Thanks!
Ian

[Trumany]

Hi, the answer of Q1 exists in the lane mapping table you pasted. NVHS pins can be for PCIex8 port.

[ian.draney]

Hi @Trumany , @WayneWWW ,

Thank you for clarifying the possibility of using the additional NVHS pins for PCIe.

Specifically for AGX Xavier, is it possible to create a single PCIe x4 bus with the proper device tree modifications using the following pins?

• NVHS1_RX2/TX2
• NVHS1_RX3/TX3
• UPHY_RX10/TX10
• UPHY_RX11/TX11

UFS x1 and USB 3.1 are not needed from those pins, as defined in the AGX Xavier config.

We would like to use an AGX Xavier on a custom carrier board, then upgrade to AGX Orin in the future without carrier board modifications.

Thanks!
Ian

[WayneWWW]

No, for xavier agx, only the table as the document shown is supported.

[ian.draney]

Hi @WayneWWW ,

Thank you for the super fast response! The confirmation very much appreciated.

Thanks!
Ian