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I have a digital circuit with several inputs that I want to change over time in precise ways. For example, D0 becomes 0 at T=1, then becomes 1 at T=3, then becomes 0 at T=10. These are not simple square waves. And the different inputs do not necessarily "change together".

The closest I can see is a timed switch, which allows a single transition at a specific time.

Thanks Steve

Sounds to me like a job for one of the Arduino family controllers. Using this you would handle the program of each of the several inputs in software.