These zeros are supplied by the MQ register which is {HEAD ~ part} of {TAIL ~ the FPP} 
These zeros are supplied by the MQ register which is { HEAD ~ part } of { TAIL ~ the FPP }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL