compare clock

The compare clock command defines a clock that can then be used for clocked-mode comparisons. In clocked-mode comparisons, signals are sampled and compared on a specified strobe.

Syntax

compare clock

[-rising | -falling | -both] [-offset <delay>] [-when {<expression>}]
[-wavewindow <name>] [-wavepane <n>] <clock_name> <signal_path>

Arguments

-rising

Specifies that the rising edge of the specified signal should be used. Optional. This is the default.

-falling

Specifies that the falling edge of the specified signal should be used. Optional. The default is rising.

-both

Specifies that both the rising and the falling edge of the specified signal should be used. Optional. The default is rising.

-offset <delay>

Specifies a time value for delaying the sample time beyond the specified signal edge. Optional. The default is 0. If a unit (e.g., ps) is used with the time value, the time must be placed in curly braces.

-when {<expression>}

Specifies a conditional expression that must evaluate to "true" or "1" for that clock edge to be used as a strobe. Optional. The expression is evaluated at the time of the clock edge, rather than after the delay has been applied. See "GUI_expression_format" for legal expression syntax.

-wavewindow <name>

Specifies the name of the Wave window in which the strobe will be viewed. Optional.

-wavepane <n>

Specifies the pane of the Wave window in which the strobe will be viewed. Optional.

<clock_name>

A name for this clock definition. Required. This name will be used with the compare signal command when doing a clocked-mode comparison.

<signal_path>

A full path to the signal whose edges are to be used as the strobe trigger. Required. The path must include the dataset name.

Examples

compare clock -rising strobe gold:.top.clock

Defines a clocked compare strobe named "strobe" that samples signals on the rising edge of signal gold:.top.clock.

compare clock -rising -delay {12 ns} clock12 gold:/mydesign/clka

Defines a clocked compare strobe named "clock12" that samples signals 12 ns after the rising edge of signal gold:/mydesign/clka.

See also

compare add, Waveform Comparison chapter

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