Don’t Forget the Protocol! A CDC Protocol Methodology to Avoid Bugs in Silicon
Clock-Domain Crossing (CDC) issues are the second most common reason for silicon re-spins. Most modern day designs have more than one clock, many of which are asynchronous. Signals that pass between logic clocked by different asynchronous clocks are called clock-domain crossing (CDC) signals. Due to the asynchronous nature of clocks, there is a possibility of CDC signals going metastable and propagating incorrect logic downstream resulting in functional failure of the design.
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