USB data cable structure

Respectively by the ground wire, power cords, D + and D - four lines, D + and D - is the differential input lines, it is using a 3.3 V voltage (note: oh, and the 5 V CMOS level), to the power line and ground equipment to provide a 5 V voltage, maximum current of 500 ma (can be set in the programming, as for the hardware implementation mechanisms, don't tube it!) .

USB data format: USB data, like any other, is made up of strings of binary digits. First, strings of digits form domains (of which there are seven), domains form packets, packets form transactions (IN, OUT, SETUP), and transactions form transfers (interrupt transfers, parallel transfers, batch transfers, and control transfers).

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