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