hasChanged

Detect data change in test step

Syntax

tf = hasChanged(u)

Description

tf = hasChanged(u) returns 1 (true) if the value of u at the beginning of the current time step is different from the value of u at the beginning of the previous time step. Otherwise, the operator returns 0 (false).

Examples

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Detect Value Change

Detect if x has changed value. This statement returns true if x has changed.

hasChanged(x)

Detect Value Change in a Bus

For a bus with two signals, signal_1 and signal_2, and data as the name of the input to the test sequence, detect when the value of signal_2 has changed.