Just in case you dont want to have the buffer, let skip the auto insertion from Vivado when building the design_1_wrapper design. Or, you can manually remove the buffer and just connect its input output. Re: Critical warning of "No clock" received after implementation in Vivado No clock probably makes sense.

Understanding the Context

Either the tools need you to define something as a clock in the xdc, or the tools need to see a clock source somewhere in the clock tree. I don't know which one as I've always had defined clocks. Because you are doing something that is more of a research project than a normal design ... Would like suggestions on what & where I am going wrong.

Key Insights

Target: Develop a Hello World C code to be run on a MicroBlaze MCS processor implemented on Artix AC701 using Vivado 2014.4 and SDK. What is done: Upto bit file generation of my top level design file which just contains the instantiation... Free 3 day trial for you to try out the tool that will optimize your connection for online gaming. Better yet: you don't even need to register a credit card to start the trial. Stay Connected with DON!

Final Thoughts

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Vijay is recruited by a police officer to masquerade as his lookalike Don, the leader of an international gang of smugglers. Things go wrong when the officer is killed and Vijay is left to fend for himself.