[问答]

有办法刷新MCB读FIFO而不必将其计时直到空吗？

663 MCB

问答对人有帮助，内容完整，我也想知道答案 0 问题：有没有办法刷新（即，重置）MCB读FIFO而不必将其计时直到空？背景信息：我们有一个PCI接口设置，可以从MCB读取。大多数情况下，交易是32个单词，每个单词都有一个新的起始地址。每次要求在每个（32字）事务之间刷新MCB读FIFO将加载64个字。这是通过选通MCB读时钟直到FIFO最终为空来完成的，此时我们已准备好进行另一次PCI事务。这有效，但需要时间，从而降低吞吐量。读指针复位确实是我们所需要的。解决方法的想法包括在刷新时间内将读取时钟频率提高，但这会导致时序收敛问题。另一个想法是使用两个MCB端口并在它们之间切换，但所有端口都在使用。还有其他任何想法或解决方法吗？谢谢，麦克风以上来自于谷歌翻译以下为原文 Question: Is there any way to flush (ie., reset) the MCB read FIFO without having to clock it down till empty? Background info: We have a PCI interface setup to read from the MCB. Much of the time the transactions are for 32 words each with a new starting address. The MCB read FIFO will get loaded with up with 64 words each time requiring it to be flushed in between each (32 word) transaction. This is being done by strobing the MCB read clock until the FIFO is finally empty at which time we're ready for another PCI transaction. This works but takes time thereby reducing throughput. A read pointer reset is really what we needed. Work-around ideas include bumping the read clock frequency up just during the flush time but this causes timing closure issues. Another thought is to use two MCB ports and toggle between them but all ports are being used. Any other ideas or work-arounds out there? Thanks, Mike 0
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答案对人有帮助，有参考价值 0 一种可能的解决方法是在MCB读端口的输出端放置一个FIFO。通过移动数据字 - 当它们到达MCB读取FIFO时 - 从MCB读取FIFO到中间FIFO，保持MCB读取FIFO耗尽。这为您提供了一个可以显式控制的备用FIFO。你可以随心所欲地跳过/刷新任意数量的单词。 - 鲍勃埃尔金德签名：新手的自述文件在这里：http：//forums.xilinx.com/t5/New-Users-Forum/README-first-Help-for-new-users/td-p/219369总结：1。阅读手册或用户指南。你读过手册了吗？你能找到手册吗？2。搜索论坛（并搜索网页）以寻找类似的主题。不要在多个论坛上发布相同的问题。不要在别人的主题上发布新主题或问题，开始新的主题！5。学生：复制代码与学习设计不同.6“它不起作用”不是一个可以回答的问题。提供有用的详细信息（请与网页，数据表链接）.7。您的代码中的评论不需要支付额外费用。我没有支付论坛帖子的费用。如果我写一篇好文章，那么我一无所获。以上来自于谷歌翻译以下为原文 One possible workaround is to place a FIFO at the output of the MCB read port. Keep the MCB read fifo drained by moving data words -- as they arrive in the MCB read fifo -- from the MCB read fifo to the intermediate FIFO. This gives you an alternate FIFO which you can control explicitly. You can skip/flush as many words as you like, as often and as quickly as you like. -- Bob Elkind SIGNATURE: README for newbies is here: http://forums.xilinx.com/t5/New-Users-Forum/README-first-Help-for-new-users/td-p/219369 Summary: 1. Read the manual or user guide. Have you read the manual? Can you find the manual? 2. Search the forums (and search the web) for similar topics. 3. Do not post the same question on multiple forums. 4. Do not post a new topic or question on someone else's thread, start a new thread! 5. Students: Copying code is not the same as learning to design. 6 "It does not work" is not a question which can be answered. Provide useful details (with webpage, datasheet links, please). 7. You are not charged extra fees for comments in your code. 8. I am not paid for forum posts. If I write a good post, then I have been good for nothing.

2019-6-10 08:21:13 评论举报张晓宁