电子与封装
電子與封裝
전자여봉장
EIECTRONICS AND PACKAGING
2014年
5期
33-36
,共4页
FIFO%亚稳态%Gray码%单步循环码
FIFO%亞穩態%Gray碼%單步循環碼
FIFO%아은태%Gray마%단보순배마
FIFO%metastability%gray code%signal step cyclic code
如何防止产生亚稳态问题，更好地同步异步信号及准确地设计空、满、几乎空、几乎满控制信号的产生是异步FIFO设计的两大难点。介绍了一种异步FIFO的设计方法，用先比较读写地址产生空满标志，再同步到相应的时钟域的方法来准确设计标志位信号的产生。采用格雷（Gray）码来避免亚稳态的出现，性能较稳定，并比较了利用Gray码、单步循环码作异步FIFO指针的优缺点。最后，给出了系统的仿真及综合结果。
如何防止產生亞穩態問題，更好地同步異步信號及準確地設計空、滿、幾乎空、幾乎滿控製信號的產生是異步FIFO設計的兩大難點。介紹瞭一種異步FIFO的設計方法，用先比較讀寫地阯產生空滿標誌，再同步到相應的時鐘域的方法來準確設計標誌位信號的產生。採用格雷（Gray）碼來避免亞穩態的齣現，性能較穩定，併比較瞭利用Gray碼、單步循環碼作異步FIFO指針的優缺點。最後，給齣瞭繫統的倣真及綜閤結果。
여하방지산생아은태문제，경호지동보이보신호급준학지설계공、만、궤호공、궤호만공제신호적산생시이보FIFO설계적량대난점。개소료일충이보FIFO적설계방법，용선비교독사지지산생공만표지，재동보도상응적시종역적방법래준학설계표지위신호적산생。채용격뢰（Gray）마래피면아은태적출현，성능교은정，병비교료이용Gray마、단보순배마작이보FIFO지침적우결점。최후，급출료계통적방진급종합결과。
How to prevent metastability, and better synchronous asynchronous signals to accurately design empty, full, alempty, alfull control signal which are the two major dififculties. The paper introduce a method of asynchronous FIFO design, ifrst comparing the reading and wirting address to generate empty and full lfag, secondly, synchronous to the corresponding clock domain approach to accurate the lfag accurately. The Gray code can avoid the emergence of metastability and get more performance. And the paper also analyze the Gray code and signal step cyclic code advantages and disadvantages to produce the iffopointer. Finally, the paper show the system simulation and DC results.
