A vector register provides the capability for simultaneously writing through {HEAD ~ at least two write ports} and simultaneous reading from {TAIL ~ at least two read ports} 
A vector register provides the capability for simultaneously writing through { HEAD ~ at least two write ports } and simultaneous reading from { TAIL ~ at least two read ports }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL