Accordingly, {TAIL ~ a small scale refresh counter circuit} with high degree of {HEAD ~ flexibility} in control can be realized 
Accordingly , { TAIL ~ a small scale refresh counter circuit } with high degree of { HEAD ~ flexibility } in control can be realized
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH