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