In response to determining that the interface is coupled to {HEAD ~ the host device}, the electronic circuit is coupled to the interface such that power is supplied to the electronic circuitry from {TAIL ~ the host device} 
In response to determining that the interface is coupled to { HEAD ~ the host device } , the electronic circuit is coupled to the interface such that power is supplied to the electronic circuitry from { TAIL ~ the host device }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL