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4. Place the 0.1 uF capacitors even though no connector is used for the DS port (as FX3 is directly connected onboard. As there is no connector, place the capacitor anywhere on the Tx lines of the DS port of the Hub)
5. Make sure the TX and RX look like the connection shown in the figure.
In the above figure, the value of each cap is 0.1uF
6. According to the USB specification, each DS port must have a minimum capacitance of 120 μF on the VBUS pin to maintain stable voltage under maximum load condition. This 120uF capacitor is required when FX3 is connected to the Hub with a connector. But when it is connected onboard, there is no need for this capacitor. VBUS pin of FX3 can be directly connected to VBUS_DS line of the Hub.