Data transport question

Autonomous Machines Jetson & Embedded Systems Jetson TX2
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1

Hello Everyone,

For my project I need to transport 14 Gpbs of raw LiDAR data from our system to a TX2. We plan to do some post processing on the GPU cores.

My first idea was to use the 12 MIPI CSI-2 lanes. I think this would work but I am worried about the trace delay requirements I found on in the carrier board specs (page 25 table 15). It states that the max delay for my cable+system is 473 ps. That is 6.7 cm of trace and cable length between the TX2 header and my FPGA. I don’t think I can make that work.

My second idea was to use PCIe. Page 17 table 9 says I have 375 ps of max delay for PCIe. (5 cm of trace). Can anyone really make that work?

I don’t have a 3rd idea. I am looking into some kind of a GMSL or FPD-link III bridge but that seems like overkill for what should essentially be data transport inside of 30 cm. I thought MIPI would work over 30 cm and PCIe would work over 50cm or greater. Am I missing something here?

Thanks
Justin

2

Hi, I think your judgement is correct.

I would suggest the PCIE choice.
Usually MIPI can work around 20+cm, PCIE cable can be extended to 7 meter if you chose some professional one.

Current generation of GMSL or FPD-Link III may make your case complex.
Since you probably need to make multiple bridge to get 14Gbps bandwidth.

5

Please refer to the OEM Design guide, the max trace length in Signal Routing Requirements is a total requested value out of module to meet MIPI/PCIE specification.