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unused pins on CC2538

Other Parts Discussed in Thread: CC2538

What document explains what to do with the unused pins on PCB layouting? 

If it is on any of these two links below, can you please state where exactly is it described? 

http://www.ti.com/lit/ds/symlink/cc2538.pdf

http://www.ti.com/lit/ug/swru319c/swru319c.pdf

If it is not documented, how should I connect pin 4 (DVDD_USB), pin2 (USB_P) and pin3(USB_N)? I don't use the USB interface.

Should I set as output for the all unused GPIOs and left them unconnected?