A signal waveform is made of individual segments.
Each segment contains two parts, in the following order:
transition and level.
Each part can be of width zero units, but not both. Thus, a segment is of a width of at least one unit.
Signal values are:
Low (L), High (H), High-Z (Z) or Don't care (X).
Value colors and default segment widths are set with the Waveform options dialog (Diagram | Waveform options).
Begin by adding a new Signal waveform row
Menu: Add | Signal
This will create a new empty row with the signal's name to its left. The row can then be moved up and down, edited, duplicated and deleted (see row operations).
Continue by adding individual segments to this waveform (see Signal & Bus Operations).