设备是Spartan 3E系列，要想延迟20ms外部clk频率是30 Mhz，请问需要使用DCM吗？

Gabor意味着您应该每隔20 ms（使用计数器）发出一个“1”的信号。
将该信号用作时钟使能。
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在原帖中查看解决方案



以下为原文

Gabor means that you should make a signal that is '1' only every 20 ms (using a counter). Use that signal as a clock enable.

Please google your question before asking it.
If someone answers your question, mark the post with "Accept as solution". If you see a particularly good and informative post, consider giving it Kudos (the star on the left).View solution in original post

您需要以不同的方式考虑这个问题。
这完全是不合理的
假设您应该有一个以您需要更新的频率运行的时钟
设计的每个小部分。
特别是当事情运行非常缓慢的时候
系统时钟，您需要使用计数器来产生延迟。
假设你
有30 MHz，甚至不知道什么是DCM。
想想你是如何产生的
延迟20毫秒（提示：30 MHz时钟将在20 ms内有600,000个周期）。
制作一个运行在30 MHz的计数器，每20 ms给出一个使能脉冲。
然后
用它来启用你的其他计数器。
HTH，
的Gabor
-  Gabor



以下为原文

You need to think of this problem in a different way.  It is completely unreasonable to
assume that you should have a clock that runs at the frequency you need to update
each small part of a design.  Especially when things run very slow compared to the
system clock, you need to use counters to generate your delays.  So assume you
have 30 MHz and don't even know what a DCM is.  Think about how you generate
a delay of 20 milliseconds (hint:  the 30 MHz clock will have 600,000 cycles in 20 ms).
Make a counter that runs on 30 MHz and gives an enable pulse every 20 ms.  Then
use that to enable your other counter.
 
HTH,
Gabor
-- Gabor

嗨，
--------------------------------------------------
--------------------------------------------------
----------------
您需要以不同的方式考虑这个问题。
这完全是不合理的
假设您应该有一个以您需要更新的频率运行的时钟
设计的每个小部分。
特别是当事情运行非常缓慢的时候
系统时钟，您需要使用计数器来产生延迟。
假设你
有30 MHz，甚至不知道什么是DCM。
想想你是如何产生的
延迟20毫秒（提示：30 MHz时钟将在20 ms内有600,000个周期）。
制作一个运行在30 MHz的计数器，每20 ms给出一个使能脉冲。
然后
用它来启用你的其他计数器。
--------------------------------------------------
--------------------------------------------------
----------------
对不起，我无法得到你。请解释我这个....
感谢你，Mahesh Hegde。



以下为原文

Hi,
--------------------------------------------------------------------------------------------------------------------
You need to think of this problem in a different way.  It is completely unreasonable to
assume that you should have a clock that runs at the frequency you need to update
each small part of a design.  Especially when things run very slow compared to the
system clock, you need to use counters to generate your delays.  So assume you
have 30 MHz and don't even know what a DCM is.  Think about how you generate
a delay of 20 milliseconds (hint:  the 30 MHz clock will have 600,000 cycles in 20 ms).
Make a counter that runs on 30 MHz and gives an enable pulse every 20 ms.  Then
use that to enable your other counter.
--------------------------------------------------------------------------------------------------------------------
Sorry I am not able to get you.Please explain me regarding this....
Thanks You in Advance,
Mahesh Hegde.

Gabor意味着您应该每隔20 ms（使用计数器）发出一个“1”的信号。
将该信号用作时钟使能。
请在询问之前先查询您的问题。如果有人回答您的问题，请在“接受为解决方案”标记该帖子。
如果你看到一个特别好的和信息丰富的帖子，考虑给它Kudos（左边的星）。



以下为原文

Gabor means that you should make a signal that is '1' only every 20 ms (using a counter). Use that signal as a clock enable.

Please google your question before asking it.
If someone answers your question, mark the post with "Accept as solution". If you see a particularly good and informative post, consider giving it Kudos (the star on the left).