The layout requirement for USB interfaces depends on the version that needs to be supported. Up
to USB 2.0, the interface was consisting of a single bidirectional data signal pair. The USB 3.0
standard introduces two additional data signal pairs for the Super Speed link. These two pairs are
running at 5 Gbit/s and are fully compliant to the PCI Express Base Specification, Revision 2.0.
Super Speed signals support the Polarity Inversion. This means the positive and negative signal
pins can be inverted in order to simplify the layout by avoiding crossing of the signals. But it is not
allowed to swap the receiving signals with the transmitting ones. The USB 2.0 data signals do not
support Polarity Inversion, D+ and D- cannot be swapped.
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