The protocol supports a memory subsystem which queues memory requests such that the processor, or cache memory requesting data, relinquishes {HEAD ~ the shared bus} after making {TAIL ~ its request} 
after making
The protocol supports a memory subsystem which queues memory requests such that the processor , or cache memory requesting data , relinquishes { HEAD ~ the shared bus } after making { TAIL ~ its request }
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