During coarse tuning, a reference signal used to control an output frequency of {HEAD ~ the PLL} is provided to the coarse tuning circuitry and is divided by a factor M to provide {TAIL ~ a divided reference signal} 
During coarse tuning , a reference signal used to control an output frequency of { HEAD ~ the PLL } is provided to the coarse tuning circuitry and is divided by a factor M to provide { TAIL ~ a divided reference signal }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL