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=== Synchronicity ===
A synchronous FIFO is a FIFO where the same clock is used for both reading and writing. An asynchronous FIFO uses different clocks for reading and writing and they can introduce [[metastability]] issues. A common implementation of an asynchronous FIFO uses a [[Gray code]] (or any unit distance code) for the read and write pointers to ensure reliable flag generation. One further note concerning flag generation is that one must necessarily use pointer arithmetic to generate flags for asynchronous FIFO implementations. Conversely, one may use either a [[leaky bucket]] approach or pointer
A hardware FIFO is used for synchronization purposes. It is often implemented as a [[circular queue]], and thus has two [[Pointer (computer programming)|pointers]]:
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