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Question
Draw the output signals C1 and C2 in the given combination of gates (Figure).
Diagram
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Solution
`C_1 = barbar(barA * barB) = barbar(barbarA + barbarB) = bar(A + B)`
| A | B | C | D | E | F | G | H | I | C1 |
| 0 | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 1 |
| 1 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 1 | 0 |
| 0 | 1 | 0 | 1 | 1 | 0 | 0 | 1 | 1 | 0 |
| 1 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 1 | 0 |
`C_2 = bar(barA * barB) = barbarA + barbarB = A * B`
| A | B | C | D | E | F | G | C2 |
| 0 | 0 | 0 | 0 | 1 | 1 | 1 | 0 |
| 1 | 0 | 1 | 0 | 0 | 1 | 1 | 0 |
| 0 | 1 | 0 | 1 | 1 | 0 | 1 | 0 |
| 1 | 1 | 1 | 1 | 0 | 0 | 0 | 1 |
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