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File:Lenovo USB-C Dock 40AY block diagram.svg

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Somewhat speculative block diagram of a pure USB-C dock based entirely on lsusb -t

Summary

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Description
English: Somewhat speculative block diagram of a pure USB-C dock based entirely on lsusb -t

Speculative points are

  • The specific USB topology used, the USB 2.0 and USB 3.0 tree do not line up at all. In particular, the first USB 2.0 hub only enumerates as a three-port hub and then has an attached cascade of two four-port hubs, while the USB 3.0 topology is a 4-port hub with another 4-port hub. My guess is that there's a separate three port 2.0 hub sitting between the upstream USB-C and the first VL82x hub.
  • The MST structure and TMDS conversion, it could be there is no separate TMDS conversion chip
    • The MST hub is a Synaptics part (as per i915 mst dump), and if it is a VMM5320 then it would have a native HDMI port (2x DP/++, 1x HDMI). That chip also does DSC decompression (see below).
  • The documentation states that this supports dual 4K 60 Hz, which obviously exceeds the available DisplayPort bandwidth of 2 lanes of HBR3 in alt-mode. Maybe if you forego USB 3.0 entirely?
    • It is very likely that the MST hub supports DSC compression. It clearly does _something_ with DSC, because a DSC-enabled display seemingly cannot be driven in a DSC mode through this hub. So it seems very likely to me that the MST hub always decompresses a DSC signal.
Date
Source Own work
Author Phiarc
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File history

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Date/TimeThumbnailDimensionsUserComment
current14:37, 25 January 2025Thumbnail for version as of 14:37, 25 January 2025791 × 681 (48 KB)Phiarc (talk | contribs)tweak depiction of USB-c connection
13:47, 25 January 2025Thumbnail for version as of 13:47, 25 January 2025791 × 681 (48 KB)Phiarc (talk | contribs)accurize USB 2.0 path - it wouldn't go through the alt-mode mux
13:44, 25 January 2025Thumbnail for version as of 13:44, 25 January 2025791 × 681 (47 KB)Phiarc (talk | contribs)Added separate USB 2.0 topology
13:36, 25 January 2025Thumbnail for version as of 13:36, 25 January 2025791 × 681 (47 KB)Phiarc (talk | contribs)Uploaded own work with UploadWizard

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