540 Index verification languages , 358­9 Verilog , 350 , 356 Verisity , 358 Very High Speed Integrated Circuit (VHSIC) program , 356 Very-Large Scale Integration (VLSI) , 188 VHDL , 350 , 356 VHSIC (Very High Speed Integrated Circuit) program , 356 VHS tapes , 161 VI (Visual Interface) , 363 vias , 180 , 263 , 263 f , 265 , 298 versus holes , 264­5 hybrids , 278 via-screen , 299 vigesimal (base-20) system , 76 Visual Interface(VI) , 363 VLSI (Very-Large Scale Integration) , 188 volatile , 194 Volta, Count Alessandro , 19 f voltage , 18­19 f wafers , 175 wagon wheel pattern , 269 f Walter Brattain , 39 water clock , 72 water molecule , 14 water tank representation of capacitance , 22 of voltage, current, and resistance , 18­19 Watt, James , 19 f watts , 19 , 19 f waveforms , 4 , 5 , 6 wave soldering , 259­60 weasel words , 361 wells (in multichip modules) , 301 , 302 wetware , 308 f Wilder, John Tukey , 78 William of Ockham , 107 f Williams, R. Stanley , 28 William Shockley , 39 , 429 Winston Churchill , 342 wire bonding , 287 Xilinx , 227 XNOR gate/function , 54 , 54 fp , 54­ 562­3 , 101 , 126 pass-transistor implementation , 63­5 , 424 XNORs even number of , 391 odd number of , 392 Reed-Müller implementations , 392 XOR gate/function , 52 fp , 53 , 62­3 , 100­1 , 456­7 pass-transistor implementation , 424 pass-transistor implementations , 63­5 Y yocto , 31 yotta , 31