异步FIFO的设计分析

摘要

基于FIFO的工作原理依次论述了异步FIFO的读写控制逻辑和空满状态判断逻辑，突破了传统的方法，采用分别为读、写指针增添一位附加位的方法来更快、更准确地判断异步FIFO的空、满状态，设计了一款具有转发功能的FIFO。测试结果表明：此款FIFO的转发功能正常，读写速率可达到165 MHz。%Based on the principle of FIFO,in turn,the asynchronous FIFO's read/write control logic and empty/full judgment logic are discussed. Through breaking the traditional methods,an additional potential method is structed respectively by addeding the addotional bit to the read/write pointer to make a judge of the asynchronous FIFO's empty/full state faster and more accurately and a FIFO with forwarding function is designed. The test results show that the forwarding function of this FIFO is normal,and the speed of reading and writing can arrive at 165 MHz.