Gray code counter In progress
A 3-bit binary count with its Gray code loaded beside it at the same edge, and why one bit per step, the wrap included, lets a count cross clock domains.
Tagged clock-domain-crossing
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Pulse synchronizer In progress
A one-cycle pulse carried into another clock domain. A toggle flop makes it a level, two flops carry it across, and a flop and an XOR make it a pulse again.
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Two-flop synchronizer In progress
One asynchronous input into a single flip-flop and into two, side by side. What metastability looks like, and what the second flop actually buys.