and wherein said interface means cooperates with said cache means to implement {HEAD ~ said hardwired protocol} as {TAIL ~ a snooping coherency protocol} which updates said first and second directory means to a concurrently valid status condition via non concurrent clock cycles 
as
and wherein said interface means cooperates with said cache means to implement { HEAD ~ said hardwired protocol } as { TAIL ~ a snooping coherency protocol } which updates said first and second directory means to a concurrently valid status condition via non concurrent clock cycles
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 TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH