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Yes, I have "create_clock" command in sdc.the tool did not find any clocks, that simple. do you have any defined in your sdc?
After IO pad insertion, I replace clk with top level clk_io in sdc.try report_clocks, it will tell you whether you really have properly defined clocks
Thanks alot Sir,nothing suspicious there. maybe the IO connection is not done properly? I assume the IO has some in/out port and some config bits that you have to set. If, by mistake, you configured the clock IO as an output, it could create a weird behavior like what you are describing. double check that.