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