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Halfadder

Halfadder. a. =1. s. &. c out. b. Fulladder. Halfadder. generate. HA. a. ≥1. c out. b. propagate. generate. HA. propagate. s. c in. Ripple Carry Adder. b i-1. a i-1. c i-1. b 1. a 1. b 0. a 0. 0. FA. FA. FA. c i. s i-1. c 2. s 1. c 1. s 0.

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Halfadder

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  1. Halfadder a =1 s & cout b

  2. Fulladder Halfadder generate HA a ≥1 cout b propagate generate HA propagate s cin

  3. Ripple CarryAdder bi-1 ai-1 ci-1 b1 a1 b0 a0 0 FA FA FA ci si-1 c2 s1 c1 s0

  4. Manchester Carry Chain p schaltet wenn p=0 g HA cout a b p p transmissiongate p cin schaltet wenn p=1 p

  5. Carry Skip Adder FA FA FA ≥1 cin cout a0 b0 a1 b1 a2 b2 =1 =1 =1 & &

  6. Carry Look AheadAdder g0 p0 g1 p1 g2 p2 g3 p3 cout c1 c2 c3 c0 s0 s1 s2 s3 a0 b0 a1 b1 a2 b2 a3 b3

  7. Carry Select Adder b7…b4 a7…a4 c4=1 b7…b4 a7…a4 c4=0 4 Bit Adder 4 Bit Adder b3…b0 a3…a0 c0 cout, s7…s4 cout, s7…s4 MUX 4 Bit Adder c4 cout, s7…s4 s3…s0

  8. Serial Adder D Q sum Clk a FA b D Q cin Clk cout & damit nicht Carry von alter Addition übernommen wird

  9. Alignment 0 8 16 24 Byte 1 Byte 2 Byte 3 Byte 4 Wort nicht möglich, da Beginn immer bei Vielfachen der Länge kein Wort Wort

  10. Schaltung gegen Spikes Din gegen Spikes, die durch Verzögerungen des Negators entstehen & Clk & ≥1 Z Clk 1 &

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