| 摘要 |
A structure and method for electrically isolating a universal serial bus (USB) communication link is provided. One aspect of this disclosure relates to a system for isolating a host from a peripheral. The system includes a first programmable logic device for selectively passing two host USB lines into four host unidirectional lines. Four optoisolators are connected to the first programmable device via the four host unidirectional lines. A second programmable logic device for selectively passing four peripheral unidirectional lines into two peripheral USB lines is connected to the four optoisolators via the four peripheral unidirectional lines. The first and second programmable logic devices detect arriving edge transitions to determine whether a signal is arriving from a host or a peripheral, and disable and enable corresponding input and output lines to maintain unidirectional flow of the signal through the four optoisolators. Other aspects and embodiments are provided herein.
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