Through the transistors {TAIL ~ 15a}, 15b, the data lines {HEAD ~ DL, DL}, are connected to the gates of the n transistors 13a, 13b, so that only the read circuits 1Oa, 10b can be activated 
Through the transistors { TAIL ~ 15a } , 15b , the data lines { HEAD ~ DL , DL } , are connected to the gates of the n transistors 13a , 13b , so that only the read circuits 1Oa , 10b can be activated
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH