The data bus grant {HEAD ~ line} to {TAIL ~ the memory controller} is overloaded to use it as a back pressure, get off the bus signal as well as a normal data bus grant line 
to
The data bus grant { HEAD ~ line } to { TAIL ~ the memory controller } is overloaded to use it as a back pressure , get off the bus signal as well as a normal data bus grant line
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL 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 OTH OTH OTH OTH OTH