about component made by user logic

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Yeah, I have chosen all the possible optimizations for the project. Although the Nios and peripherals run in asynchoronizing mode, only one system clock be input here.[/b]

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I&#39;m a little confused about that. So you don&#39;t run your custom hardware at the same clock? If that&#39;s the case then you need to synchronize the interface to your hardware so that the data gets across properly.

I will need some more information about the system now (NIOS and the custom hardware) because I&#39;m drawing at straws here.