CHRDY is a signal which becomes “H” upon {HEAD ~ completion} of {TAIL ~ an initialization operation} of all internal circuits after turning on a power supply 
CHRDY is a signal which becomes “ H ” upon { HEAD ~ completion } of { TAIL ~ an initialization operation } of all internal circuits after turning on a power supply
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH