cable.com/product' target='_blank'>USB cable is one of the most common function data transfer and charging, and other structure of the very few people know that the following to everyone more comprehensive knowledge structure of USB cable: USB cable structure: respectively by the ground wire, power cords, D + and D - Four lines, D + and D - Is the differential input line, its use is 3. 3 v voltage ( Note well, with 5 v CMOS level different) Can provide to the device, and the power cord and ground 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: like other, USB data is composed of binary Numbers, first of all the Numbers domain ( There are seven kinds of) Domain to constitute a package, package to constitute the transaction ( IN、OUT、SETUP) Finally a transmission, the transaction ( Interrupt transmission, parallel transfer, mass transfer and control) 。 USB cable coding scheme: USB USES has no return to transmit data, when the difference of data input on a transmission line 0 invert, enter 1 will keep original value, in order to ensure the accuracy of signal transmission, when sending a package on the USB bus, transmission equipment is to insert ( Namely every six consecutive 1 in the data stream and then insert a 0) Change, thus forcing NRZI codes. There is data in USB cable transmission is sent from low to high.
The , essentially perfected by custom data cables, is one of the first home appliance to be widely distributed.
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