{HEAD ~ Logic control circuitry} 320 is connected to the first tracking bit line and usable to convert {TAIL ~ the voltage change} on the first tracking bit line DBL into the SAE signal 
usable to convert
{ HEAD ~ Logic control circuitry } 320 is connected to the first tracking bit line and usable to convert { TAIL ~ the voltage change } on the first tracking bit line DBL into the SAE signal
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH