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The NI Digital Waveform Editor is a graphical software tool
you can use to visualize digital signals and easily create, edit, and modify
digital waveforms for customized interfacing and test applications. You can
design digital waveforms from scratch or import existing waveforms from Value
Change Dump (.VCD) or ASCII file formats. The waveform editor offers six
different digital states so you can define waveforms on a per-channel, per-cycle
basis for generation (0, 1, or Z) and acquisition (L, H, or X) of unidirectional
and bidirectional parallel data lines. You can also fill digital signals or
buses with count up, count down, pseudorandom bit sequences, and other
well-known patterns.