The log memory is formed of a plurality of banks, and {HEAD ~ stores history information} in {TAIL ~ the plurality} of banks in a ring like fashion 
in
The log memory is formed of a plurality of banks , and { HEAD ~ stores history information } in { TAIL ~ the plurality } of banks in a ring like fashion
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH