Asynchronous FIFO is an important module which always used to absorb the phase and frequency offset between different clock domain in communication area .In this paper, an FIFO module is designed using Gray convert technology and dual-port ram , which realizing scatheless transmit between different clock domain. The advances of Gray (Only one bit changes between neighboring two clock ) improves the reliability and anti-jamming capability of the system. And the system can work normally in the bad condition which the phase and frequency offset target to 300PPM. It is proved by work that the FIFO module can fulfill the demands of real-time of data transmitting system, and the module is powerful enough for more data process in the future.

fpga.fifo.doc

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