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