The first voltage forms {TAIL ~ a first write current} for a first time duration through {HEAD ~ the resistive sense memory cell} in a first direction 
The first voltage forms { TAIL ~ a first write current } for a first time duration through { HEAD ~ the resistive sense memory cell } in a first direction
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH