{TAIL ~ The double speed clock signal} has a frequency twice as large as the frequency of {HEAD ~ the internal memory controller clock signal} 
{ TAIL ~ The double speed clock signal } has a frequency twice as large as the frequency of { HEAD ~ the internal memory controller clock signal }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD