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