A semiconductor memory having memory cells, {HEAD ~ each memory cell} includes {TAIL ~ a selection transistor} and a trench capacitor 
includes
A semiconductor memory having memory cells , { HEAD ~ each memory cell } includes { TAIL ~ a selection transistor } and a trench capacitor
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH