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Kogge-Stone CLA Subtracting?

Discussion in 'General Electronics Discussion' started by CX gamer, Jun 20, 2011.

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  1. CX gamer

    CX gamer

    Jun 9, 2011
    Hi, I've successfully built a working Kogge-Stone CLA that adds properly. But I want to learn it to subtract. Since the absence of a Cin input, I decided to replace the first bit's half adder with a full adder, leaving everything else intact.
    This circuit, however, fails, as the 4-value-bit won't propagate correctly when both x0, y0, Cin and x1 are active. Any help here?

    Thank you in advance,

  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    To subtract you add the 2's complement.
  3. CX gamer

    CX gamer

    Jun 9, 2011
    Yes I know, I invert both inputs and enabling the Cin in the full adder which replaced the 1-value-bit's half adder. But it isn't working. :(
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