SBACK1 and SBACK2 signals 480, 485 are asserted by {HEAD ~ the central arbitrator circuit} of {TAIL ~ the system bus} 110 over the bus 110 
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SBACK1 and SBACK2 signals 480 , 485 are asserted by { HEAD ~ the central arbitrator circuit } of { TAIL ~ the system bus } 110 over the bus 110
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH