{TAIL ~ Memory device} having {HEAD ~ a cyclically configured data memory} and having plural data portals for outputting/inputting data 
{ TAIL ~ Memory device } having { HEAD ~ a cyclically configured data memory } and having plural data portals for outputting / inputting data
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH