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Yeah, but standard pico usb is slow (it has usb 1.1 with 12Mbit/s or even 1.5Mbit/s). BUT you could add separate usb 2.0 phy, but AFAIK it would have to share some pins with that ethernet phy, but still doable.

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Never looked at USB 2.0 phy, but you can move any pins used by the eth phy, so I don't see why you would have to share pins between the two.

I remembered bad, ULPI uses only 12 lines, not 20, so you could easily add it without sharing pins.

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