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Example OR gate

Behavior

The OR gate outputs the result of the OR function of the 1-bit signals at the input. The output only has the value 1 if at least one of the inputs has the value 1.

Table 1. Truth table
0 1 Z X

0

0

1

0

X

1

1

1

1

X

Z

0

1

0

X

X

X

X

X

X

(Z: Undefined/High impedance, X: Error)

The behaviour for unconnected inputs or input wires carrying an undefined signal can be changed using the system preference "Open Gate Input Behaviour".

The multi-bit version of the OR gate will perform its one-bit transformation bitwise on its inputs.

Mnemonics

The logical gates of Antares can illustrate their function with so-called "mnemonics". See the chapter Descriptions and explanations. The mnemonic of the OR gate is shown below.

Example Mnemonic

Ports

Inputs

The 1-bit inputs of the OR gate. Their number is determined by the attribute "Number of inputs".

Output

The 1-bit output of the OR gate. Outputs the value of the calculated OR function.

Attributes

Orientation

The direction in which the output points.

Number of inputs

Determines how many inputs the OR gate has. There are 2 to max. 8 inputs available. Can even be changed if the gate is already connected to wires.

Negate input n

When selected, the n-th input pin is negated. The maximum of "n" is determined by attribute "Number of inputs". Negation is also applied to the truth table and the mnemonics displayed for the gate.

Output Name

The optional name displayed next to the output. This can be useful when the OR gate forms the end of a complex combinatorial circuit and the logical expression produced by the OR gate should be specified.