The invention provides for a sideband signal for the USB that has
real-time interrupt capabilities. A system and method for hardware
detection of an interrupt signal provides for the ability to superimpose
a high frequency interrupt signal on a USB power line for transmission to
a controller. Alternatively, an overcurrent flow may be generated from a
peripheral device and detected by an overflow current detector on the
USB. In response, the overflow current detector may output an
interrupt/overflow current detection signal to the controller.