The driver circuits {TAIL ~ 106 and 106′} provide differential signals on the interconnects which have a reduced voltage swing that is less than a voltage differential of a single power supply, or {HEAD ~ a single pair} of voltage rails 
The driver circuits { TAIL ~ 106 and 106′ } provide differential signals on the interconnects which have a reduced voltage swing that is less than a voltage differential of a single power supply , or { HEAD ~ a single pair } of voltage rails
OTH OTH OTH 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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH