The plurality of circuits receive the MSB mask and the least significant bits mask generated from {TAIL ~ the least significant bits section} of {HEAD ~ the pointer} and generate the output mask therefrom 
The plurality of circuits receive the MSB mask and the least significant bits mask generated from { TAIL ~ the least significant bits section } of { HEAD ~ the pointer } and generate the output mask therefrom
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH