CM4 has only one USB 2.0 interface (unless you use PCIe to USB). Many schematics short both USB ports to the same D+/D- – this fails.
A standard cm4 94v0 schematic follows a predictable hierarchical structure. Here are the essential blocks you must include. cm4 94v0 schematics
This is the most error-prone area of cm4 94v0 schematics. CM4 has only one USB 2
Even experienced designers make mistakes. Avoid these: cm4 94v0 schematics
Once you have identified the brand, use the following resources to find the schematic: