5.31. OR

Purpose

To perform a logical OR operation.

Procedure

The output becomes TRUE (=1) if at least one input signal is TRUE. Only when all input signals are FALSE does the output become FALSE (=0).

Parameters

None.

Remarks

None.

Examples

Table 1 presents the possible output values that can result from two input signals. Table 2 presents the possible output values that can result from three input signals.

Table 1: Possible output values for two input signals

Scenario	input 1	input 2	Output
1	TRUE	TRUE	TRUE
2	TRUE	FALSE	TRUE
3	FALSE	TRUE	TRUE
4	FALSE	FALSE	FALSE

Table 2: Possible output values for three input signals

Scenario	input 1	input 2	input 3	Output
1	TRUE	TRUE	TRUE	TRUE
2	TRUE	TRUE	FALSE	TRUE
3	TRUE	FALSE	TRUE	TRUE
4	TRUE	FALSE	FALSE	TRUE
5	FALSE	TRUE	TRUE	TRUE
6	FALSE	TRUE	FALSE	TRUE
7	FALSE	FALSE	TRUE	TRUE
8	FALSE	FALSE	FALSE	FALSE