y x Half Adder Full Adder r x y R x PDF document - DocSlides

y x Half Adder Full Adder r x y R  x PDF document - DocSlides

2014-12-11 95K 95 0 0

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y x Half Adder Full Adder r x y R xy rxy S rxy xy rxy xyr Exclusive OR xy rx y brPage 2br c0 addition c1 substraction Multiplexor select among several inputs MUX MUX A ID: 22252

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Presentations text content in y x Half Adder Full Adder r x y R x


Page 1
. . y x Half Adder Full Adder r x y R = x.y + r.(x+y) S = r(x.y + x.y) + r.(x.y + x.y)=r Exclusive OR = x.y + r.(x y)
Page 2
c=0: addition c=1: substraction Multiplexor: select among several inputs MUX MUX ALU
Page 3
overflow 1110111001101011001010000000000 + 0 1110111001101011001010000000000 ------------------------------------------------ 1101110011010110010100000000000
Page 4
nration de la retenue ropagation de la retenue .( .( S ( t=t +2 r ( t=t x,y (t=0) x,y ( t=0 p,g ( t=2 4k-1 t=t r4k-1 4k,4k+1,4k+2,4k+3 t=max(t r4k-1 +2,4) r3 =4 r7 =6 r7 =16 r3 =8 Carry Look Ahead CLA c ,b +b .a ,b .a a,b r b + a.r 2..1 =p 2..1 =g +p =g +p 10 11 12 13 14 15
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10 11 12 13 14 15

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