in a third cycle, old data are written back into the DRAM memory, and new data from the DRAM memory are transferred into {HEAD ~ the cache memory} to replace {TAIL ~ old data} 
to replace
in a third cycle , old data are written back into the DRAM memory , and new data from the DRAM memory are transferred into { HEAD ~ the cache memory } to replace { TAIL ~ old data }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL