 if {HEAD ~ the half rate clock signal} is sampled at {TAIL ~ a first state}, selecting the quadrature of the half rate clock signal or, if the half rate clock signal is sampled at a second state, selecting a digital complement of the quadrature of the half rate clock signal; and 
if { HEAD ~ the half rate clock signal } is sampled at { TAIL ~ a first state } , selecting the quadrature of the half rate clock signal or , if the half rate clock signal is sampled at a second state , selecting a digital complement of the quadrature of the half rate clock signal ; and
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH