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I am new at using USB, and need some help deciding which devices to use for a USB interface to an existing product. Attached is a block diagram of what I need to do.
Based on your block diagram and your requirements, it seems that you will need a HUB like TUSB4041I a bridge like TUSB3410, a switch like TS3USB221 among other passive devices to make your block named "USB Interface" fulfill your requirements.