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According to usb spec, there are two power type, self-power and bus-power. If we use bus-power, Powered stage is 2nd stage. Why should we need to use external power ?
TUSB7340 is not a USB Hub. TUSB7340 is a USB 3.0-compliant xHCI host controller. Being a host controller, the system TUSB7340 is placed on sources Vbus to the down stream devices, including USB hubs that are bus powered or self powered (i.e. TUSB8041A, etc.), therefore a external power supply is needed.
