D flip-flop In progress
A D flip-flop takes d at each rising edge of the clock and holds it until the next. The always_ff that describes it, an enable, and an asynchronous reset.
Tagged asynchronous-reset
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Reset synchronizer In progress
Two flip-flops that assert a reset at once and release it only just after a clock edge. Why the release has to be synchronous, shown on a ring it can break.