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| XC3000 | XC4000E | XC4000X | XC5200 | XC9000 | Spartan | SpartanXL | Spartan2 | Virtex |
|---|---|---|---|---|---|---|---|---|
| N/A | N/A | N/A | N/A | Macro | N/A | N/A | N/A | N/A |
ADD1 is a cascadable 1-bit full adder with carry-in and carry-out. It adds two 1-bit words (A and B) and a carry-in (CI), producing a binary sum (S0) output and a carry-out (CO).
| Inputs | Outputs | |||
|---|---|---|---|---|
| A0 | B0 | CI | S0 | CO |
| 0 | 0 | 0 | 0 | 0 |
| 1 | 0 | 0 | 1 | 0 |
| 0 | 1 | 0 | 1 | 0 |
| 1 | 1 | 0 | 0 | 1 |
| 0 | 0 | 1 | 1 | 0 |
| 1 | 0 | 1 | 0 | 1 |
| 0 | 1 | 1 | 0 | 1 |
| 1 | 1 | 1 | 1 | 1 |
Figure 3.8 ADD1 Implementation XC9000