Exercises: Adder I

• Create 4-Bit Propagate/Generate Units

  • P1,P2,P3,P4
  • G1,G2,G3,G4

• Create a 4-Bit Carry Lookahead Unit

  • C1 = C0·P1+G1
  • C2 = C0·P1·P2+G1·P2+G2
  • C3 = C0·P1·P2·P3+G1·P2·P3+G2·P3+G3
  • GP = P1·P2·P3·P4
  • GG = G1·P2·P3·P4+G2·P3·P4+G3·P4+G4

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