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Digital ElectronicsArithmetic Circuits

For a 4-bit carry look-ahead group with bit propagate terms P0,P1,P2,P3, which product indicates that an input carry can propagate through all four bit positions?

  • AP0+P1+P2+P3
  • BP0P1P2P3
  • CP0⊕P1⊕P2⊕P3
  • DP0P3 only
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Correct Answer: B. P0P1P2P3
Explanation: A carry propagates through the entire group only if every bit position propagates it, so the group-propagate condition is the product P0P1P2P3.
Reference: Standard digital electronics: carry look-ahead group propagate
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