{TAIL ~ The routing data generation circuit} generates and adds routing data to the data frame received by {HEAD ~ the buffer} 
{ TAIL ~ The routing data generation circuit } generates and adds routing data to the data frame received by { HEAD ~ the buffer }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD