File:Lenovo Thunderbolt 3 Dock 40AC block diagram.svg

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Summary

Description
English: Block diagram of a Thunderbolt 3 dock, showing internal controllers and their functions. The information in this block diagram is derived from several sources:
  • Used controllers: Teardown
  • JHL6540 DisplayPort limitations: Intel datasheet
  • DP/HDMI assignment: Tracing and also the Lenovo documentation
  • Assignment of downstream USB functions to controllers: lsusb -tv
  • USB limitations: Fresco Logic datasheet and lspci
  • VGA assignment: Leaked schematic of another laptop using the VMM3320 chip, which shows that it has a DAC for VGA. Additionally, the fact that the Parade specs don't mention analog video at all, and that the VGA output is independent of all other video outputs strongly suggested that it must be directly driven by the MST hub. The lack of an DP/VGA DAC (you might expect the Dock controller to be that chip based on position, but it absolutely is not) also further implies the VMM3320 directly provides this signal. That's sufficient circumstantial evidence for me to draw that line in a block diagram, even if I didn't have that schematic.
Date
Source Own work
Author Phiarc
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Captions

Block diagram of a Thunderbolt 3 dock, showing internal controllers and their functions

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inception

24 January 2025

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53,650 byte

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39868efae1030e00c3d1af8db705b72c359b563a

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Date/TimeThumbnailDimensionsUserComment
current06:57, 25 January 2025Thumbnail for version as of 06:57, 25 January 2025751 × 732 (52 KB)wikimediacommons>Phiarcsome text layout fixes caused by converting the diagram to a Commons-compatible (non-XHTML foreignObject-containing) format

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