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