{HEAD ~ The data bus} grant 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 
{ HEAD ~ The data bus } grant 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
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH 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