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