A Logic Cookbook for Synthesis

One thing cannot happen until after another has happened

Attibution: mdoudoroff

flipflops will hold low or high until something causes them to flip

You can use a flipflop to track whether something has happened or not, and employ the output downstream (in another logic module or VCA) to prevent something else from happening prematurely.

Note: A plain flipflop may have only one effective input and be hard to work with except as a divide-by-two. Some flipflops, such as the Set/Reset feature of Klavis Logica XT, have separate set and reset inputs.


Result: the output will not go high until a trigger at the SET input arrives. The output will remain high until another trigger either resets or toggles the flipflop.

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