In a write/read mode, data is transited from {TAIL ~ an input/output buffer} via the transition circuit to {HEAD ~ an input} of the write amplifier or from an output of the sense amplifier via the transition circuit to an input/output buffer 
In a write / read mode , data is transited from { TAIL ~ an input / output buffer } via the transition circuit to { HEAD ~ an input } of the write amplifier or from an output of the sense amplifier via the transition circuit to an input / output buffer
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH 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