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| XC3000 | XC4000E | XC4000X | XC5200 | XC9000 | Spartan | SpartanXL | Spartan2 | Virtex |
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| Macro | Macro | Macro | Macro | Macro | Macro | Macro | N/A | N/A |
X74_283, a 4-bit full adder with carry-in and carry-out, adds two 4-bit words (A4 - A1 and B4 - B1) and a carry-in (C0) and produces a binary sum output (S4 - S1) and a carry-out (C4).
16(C4)+8(S4)+4(S3)+2(S2)+S1=8(A4+B4)+4(A3+B3)+2(A2+B2)+(A1+B1)+CO
(where “+” = addition)
Figure 11.36 X74_283 Implementation XC3000, XC4000E, XC4000X, XC5200, Spartan, SpartanXLFigure 11.37 X74_283 Implementation XC9000