In a self refresh mode, data from the output of the sense amplifier is fed back via {HEAD ~ the transition circuit} to the input of {TAIL ~ the write amplifier} 
In a self refresh mode , data from the output of the sense amplifier is fed back via { HEAD ~ the transition circuit } to the input of { TAIL ~ the write amplifier }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL