About the cross problem of jetson nano carrier schematic

May I ask what is the meaning of the cross in the schematic diagram given by jaston nano

Which schematic, page number so on? Name the particular document (sorted by L4T release) you are going by here:

Or here:

Basically, if we have a URL to an exact document, and you give a page number and perhaps some way of telling what part of the schematic you are looking at, then it would be easier to answer.

For example, on page 7 of the jetson nano schematic diagram for P3449-B01, what is the meaning of the j47 component cross under the MICRO AB USB 2.0 CONNECTOR? What is the meaning OF the cross of R289,R290, PCB CO-LAYOUT in USB 3.0 TYPE A x2 CONNECTOR (2 OF 2) on page 10, thank you very much

If possible, I would like to ask you another question. Do you have or know the pcb drawing of jetson nano? I only found its schematic diagram in the official website, and may I ask if you have the schematic diagram or pcb diagram of jetson tx2 nx? If so, I would be very grateful, and I can even get it for payment, thank you

Which URL did you use? Which schematic? I know it is P3449-B01, but there are a number of documents related to this. I’m trying to find the exact/specific document. The document I am searching on does not show the exact content from a text search, although I can see the “MICRO B USB 2.0 CONNECTOR” page. My document only shows R434 and R435 on that page.

On another page I do see R289 and R290. Those are zero ohm resistors if this is what you are looking at. That particular location is showing some optional hardware, a transformer. If the transformer is present, then you don’t use those 0 ohm resistors. If the transformer is not used, then you need to jumper the pads for those two resistors…they’re actually just jumpers and not resistors, and are present when the transformer is not used. Perhaps the transformer was once useful, but removed, and the schematic and hardware did not change (only the parts placed would change).

What I cannot answer is when to use the transformer, and when to not use it. It seems though that trying the resistors (which are just shorts; perhaps they are low wattage as some sort of protection) first is easy, as shorting the two surface mount locations is easy; if that has a reason to use the transformers, then you could later remove them and add the transformer if the circuit board layout has the surface mount pads needed.

Someone from NVIDIA could comment on the history of that transformer (it is page 10 of the Nano concept schematic).

Ok, thank you very much for your answer, “Jetson Download Center | NVIDIA Developer, jetson_nano” this site is I said the schematic diagram of data, According to what you mean and the data I checked, the crossed one means replaceable. Just like the example you gave, transformers can be replaced by two 0 ohm resistors, and two 0 ohm resistors can also be replaced by transformers, then I would like to ask you another question, do you have or know the pcb drawing of jetson nano? I just found its schematic diagram on the official website. Do you have the schematic diagram or pcb diagram of jetson tx2 nx? If possible, I would be very grateful

The only schematic I have access to is the same as you.

I need to explain ahead of time that I’m not positive about some of this, but the DIMM format (what Nano is based on, and NX) is generally compatible with the other DIMM format modules within that model (for example, a TX1-based Nano dev kit might not be compatible with an Xavier or TX2 NX). I can’t say for certain though. Someone from NVIDIA could comment on whether the eMMC based TX2 NX works on the Nano dev kit carrier board (it probably does with a device tree edit).

Note that a lot of “modules” (not dev kit models) are sold whereby they need a third party carrier board. It isn’t unusual for that to have to come from another manufacturer and to not be sold with the module unless you get it from the third party.

Hello, I have been looking at the schematic diagram of Jetson Xavier NX P3509-A01 recently, and there is something I don’t quite understand, that is, the pin I circled on the picture below has what effect on the component EFM8SB10F2G-P3509, does it work at normal times in high power? If it works at high level, So the low level this component does not work? The above are the questions I ask you, please answer them if possible. Of course, if you are not clear about this schematic, it is OK. Anyway, thank you very much for your guidance on my questions

Hi, I also want to ask you a question, while I was searching FOR the content of the section on the Jetson Xavier NX schematic BUTTON MCU FOR POWER UP, I saw a forum official said that the EFM8SB10F2G-P3509 chip of BUTTON MCU FOR POWER UP can be used without design, that is, another design can be used in this part. However, when I looked for a new design according to the position mentioned by the forum official, There is no corresponding new design, so do you know this part of the new design? If you know where it is, please let me know. Thank you very much

That’s probably a question for @Trumany, which I cannot answer. Or someone who works on the hardware end.

It is high enable.

Button MCU is not must. You can refer to the power on/off logic page in P3449 schematic for design without MCU. The key point is to follow the power sequence as listed in Xavier NX product design guide doc.

Hello, as for the Jetson Xavier NX carrier board design data, it says that VDD_IN will activate the POWER_EN pin after power-on, which means that Jetson Xavier NX will be powered on after I power it. So if I put the POWER_EN pin low on jetson Xavier NX and then power jetson Xavier NX it will not turn on. If the above conjecture is correct, then I would like to ask if the SHUTDOWN_REQ* pin on the jetson Xavier NX is still output high after I power the jetson Xavier NX and lower the POWER_EN pin?

I learned from this place that if I select the button to start up, turn off the power-on and start up, then the SHUTDOWN_REQ* will be pulled to the VDD_IN output 5V, thank you very much for your guidance

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