{HEAD ~ The pump down circuit} may be configured to generate a pump down signal in response to the pump up {TAIL ~ signal} and the control signal 
{ HEAD ~ The pump down circuit } may be configured to generate a pump down signal in response to the pump up { TAIL ~ signal } and the control signal
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH