The Nothbridge provides a SMC bus interface to an external
Philips ISP1761 USB 2.0 controller. Three USB interfaces are provided
on the baseboard,
The internal registers of the controller are memory-mapped
starting at 0x4F000000.
USB port 1 provides an OTG device interface and connects to
the mini USB A-Type connector on the front panel of the enclosure.
USB ports 2 and USB port 3 can function in either master or
slave mode and connect to the dual A-Type connector on the rear
panel of the enclosure (USB port 2 is the top connector).
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