Both address sequencers 20 and 30 generate a next address based upon the current address and {TAIL ~ the value} sampled using {HEAD ~ the current address} 
Both address sequencers 20 and 30 generate a next address based upon the current address and { TAIL ~ the value } sampled using { HEAD ~ the current address }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD