What is clock domain crossing and what are the typical challenges it presents?

Question

Anonymous · Accepted Answer

Clock domain crossing (CDC) transfers signals between circuits running on
different, asynchronous clocks, typically using synchronizers or handshaking
logic to prevent timing issues. Complications include metastability, data
corruption, missed pulses, and unpredictable behavior if signals are not
properly synchronized.

Anonymous · Answer

Clock domain crossing is when data must cross between one clock domain (area of
hardware running on a clock of one given frequency) to another clock domain with
a different frequency. Key challenges are maintaining data integrity of any data
over the crossing (data is correct, and nothing is missing) and avoiding any
metastability from as a result of the crossing.

What is clock domain crossing and what are the typical challenges it presents?

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