The first macro (pi) calculates the value of π. To use the macro feature, select Macros from the Trace menu in Probe. You can then change the time axis variable from time to this sweep function to obtain an eye display. Probe’s macro feature can be used to create a sweep function that implements the wrap feature required. If a random bit pattern is simulated and then displayed in this way, the required margins can be seen as the opening in the eye on the display. The signal wraps from the right edge of the display back to the left edge, thereby depicting a large number of overlapping data periods. In an eye display the signal is shown with a time axis that is a small number of data periods long. In communications work, the eye display is frequently used to illustrate the voltage and timing margins present in a system transmitting digital data.
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