时钟频率不变？

喜
此输出信号的频率取决于您正在使用的板载频率。
如果改变板载频率，您将能够改变切换信号的频率。
您在约束文件中更改的频率值将用于执行时序分析，它实际上不会改变您的板载频率。
有关更多信息，请参阅xilinx UG612
谢谢
shreyas
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以下为原文

hi,
 
frequency of the this output signal is depended on the onboard frequency that you are using.
you will be able to change frequency of toggling signal if you change on board frequency.
frequency value that you are changing in constraint file will be used to perform timing analysis and it doesn't practically change your onboard frequency.
for more information you can refer to xilinx UG612
 
thanks
shreyas
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喜
此输出信号的频率取决于您正在使用的板载频率。
如果改变板载频率，您将能够改变切换信号的频率。
您在约束文件中更改的频率值将用于执行时序分析，它实际上不会改变您的板载频率。
有关更多信息，请参阅xilinx UG612
谢谢
shreyas
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在发布新帖子之前在论坛或xilinx用户指南中发出问题。请注意 - 如果提供的信息解决了您的问题，请将答案标记为“接受为解决方案”。给予您认为有用的帖子给予荣誉（右边提供的星号）
并回复.----------------------------------------------
------------------------------------------------



以下为原文

hi,
 
frequency of the this output signal is depended on the onboard frequency that you are using.
you will be able to change frequency of toggling signal if you change on board frequency.
frequency value that you are changing in constraint file will be used to perform timing analysis and it doesn't practically change your onboard frequency.
for more information you can refer to xilinx UG612
 
thanks
shreyas
----------------------------------------------------------------------------------------------
Try to search answer for your issue in forums or xilinx user guides before you post a new thread.

Kindly note- Please mark the Answer as "Accept as solution" if information provided solves your query.
Give Kudos (star provided in right) to a post which you think is helpful and reply oriented.
----------------------------------------------------------------------------------------------

您可以尝试使用MMCM并通过提供输入时钟生成所需的频率。
检查Artix-7 datsheet以了解需要考虑的MMCM输入和输出时钟规格
http://www.xilinx.com/support/documentation/data_sheets/ds181_Artix_7_Data_Sheet.pdf
还请查看应该帮助您的时钟用户指南
http://www.xilinx.com/support/documentation/user_guides/ug472_7Series_Clocking.pdf
--Krishna



以下为原文

you can try to use MMCM and generate the required frequency by providing the input clock.
Check the Artix-7 datsheet for the MMCM input and output clock specifications which needs to be considered
http://www.xilinx.com/support/documentation/data_sheets/ds181_Artix_7_Data_Sheet.pdf
 
also check the clocking user guide which should help you
http://www.xilinx.com/support/documentation/user_guides/ug472_7Series_Clocking.pdf
 
--Krishna