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