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