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