Beware of "reverse engineered" schematics on random forums (GitHub Gists or Chinese forums). While well-intentioned, they often contain errors:
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When designing a hardware add-on, the GPIO section of the schematic is your authoritative reference for pin assignments, voltage levels, and interface availability. Beware of "reverse engineered" schematics on random forums
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Are you troubleshooting a or power issue?
The Broadcom SoC does not natively output USB 3.0 ports. To solve this, the schematic maps a single from the BCM2711 to a Via Labs VL805 PCIe-to-USB 3.0 Host Controller .