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Unformatted text preview: can occur using the AND operator in a Boolean expression: 0 0 equals 0 0 1 equals 0 1 0 equals 0 1 1 equals 1 Likewise, the truth table showing the behavior of the AND gate has four rows, showing all four possible input combinations. The output column of the truth table is consistent with results of these Boolean expressions. OR Gate An OR gate is shown in Figure 4.3. Like the AND gate, there are two inputs to an OR gate. If the two input values are both 0, the output value is 0; otherwise, the output is 1. The Boolean algebra OR operation is expressed using a plus sign (+). The OR gate has two inputs, each of which can be one of two values, so as with an AND gate there are four input combinations and therefore four rows in the truth table....
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- Fall '10