Compile Time in Quartus.

Question

I have two almost identical projects in Quartus.The first project compiled for 10 minutes, the second - for two hours.The project compiled for two hours has infoInfo (188005): Design requires adding a large amount of routing delay for some signals to meet hold time requirements, and there is an excessive demand for the available routing resources. The Fitter is reducing the routing delays of some signals to help the routing algorithm converge, but doing so may cause hold time failures.
For more information, refer to the "Estimated Delay Added for Hold Timing" section in the Fitter report. But how can I see form the report what is the problem?

kennyt_altera · Answer

​Can you try to opened the fitter report and check for the section "Estimated Delay Added for Hold Timing". Try to debug the issue from there.

eeren · Answer

Yes I open and compare the reports in both projects. I don't see any big difference.

kennyt_altera · Answer

​How about the resource utilization? Is both of the project same?

eeren · Answer

Thank you. With this report I found the problematic module.

eeren · Answer

Well..I removed the problematic module. Compare the reports - the two-hours-compiled project report looks even better.Can't bit it.

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Compile Time in Quartus.

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