The USB data line definition
USB is a common PC interface, only the A4 thread, two signal two power, the need to pay attention to is don't get positive and negative anti-A, otherwise it will burn a USB device or computer in the South Bridge chip!
The ID foot use until the OTG function. Because the Mini-USB interface into Mini-A, B and AB interface.
If your system is only used for Slave, then use the B interface.
The system controller can determine the ID pin to judge what kind ofequipment is inserted, if high level, is B joint is inserted, at this point the system can decide to model (master mode)
If ID is low, it is inserted into the A interface, then the system will use the HNPdialog protocol to decide which to do Master, which makes Slave.