Jetson TX2/FAQ
Here we share some useful FAQs for Jetson TX2.
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Contents
Design with module
Why TX2 uses AO-therm instead of GPU-therm (used on TX1) to monitor GPU thermal?
tags: AO-therm, GPU-therm
The real reason is GPU TSOSC cannot run below certain VDD_GPU voltages. We have a fallback mechanism for this, but for many reasons we decided the better solution is to just use AOTAG always. The AOTAG’s proximity to GPU complex is one of the reasons why this is able to be the best option.
What's the Ethernet chip in TX2?
tags: Ethernet
The Ethernet part U505 in schematic and BOM is marked as BCM89610A2BMLG, but also marked in same page of schematic as BCM546(2)10C1IMLG. After internal checking, the info from Xiaonong Liu is: BCM54610, BCM54620, and BCM89610 are all pin compatible device, at one time, BCM54620 was chosen because it can support WOL, but its temperature range can’t meet Quill module requirement. So, auto grade part 89610 was in the BOM. The Title page was put there since the start the design, because initially we would like to use commercial grade part to reduce the module cost, but later found temperature limitation of BCM5461(2).
How to cluster TX1&TX2?
tags: Cluster
In theory if customer has a carrier board with nontransparent-capable PCIe switch between two Jetson nodes, that could do it.
The recommended padstack for SEAM connector
tags: Samtec, Solder Charge Technology
General pad has smaller stencil/solder masker opening, but for SEAM connector, Samtec suggest larger opening because of their Solder Charge Technology. On Jetson the pad size is 0.64mm, stencil opening is 0.89mm and solder masker opening is 0.74mm.
Ethernet LOM-LED mode
tags: ethernet, LOM-LED
If the pull-up on DMIC4_CLK means the ethernet chip will enter LOM-LED mode? Checked the datasheet and yes it will enter LOM-LED mode with that pull-up but only if the shadow value of register 1CH is 01011, so the default pin function of LED4 (DMIC4_CLK) is not to set LOM-LED mode.
Why the value of thermal zone 6 is always 100000?
tags: thermal zone 6
The value of thermal zone 6 is always 100000. The reason is the PMIC doesn't allow software to read an actual temperature. Software can only read whether various thermal thresholds have been crossed. The first threshold is higher than 100C. So, the PMIC driver *assumes* temperature is 100C until it learns that it is even higher.
