how do i speed up place&route timing in cyclone V

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Hi,

I need help to find a way to speed up fitter time because it takes me over 4 hrs to done the fitter. my sdc file is not complicated and only 76% of usage for device resource. I don't know why what cause cyclone V take so long to do the fitter.

Thanks,

Jeff

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>70% device usage can be significant usage, depending on the size of your device. I run around 1h 10m on a Cyclone V SX with an HPS, using almost every DSP and memory block. This can balloon significantly if I leave floating inputs/outputs in the design. The best thing is to have a completely constrained design, both in connections and in timing. The more open variables you give the compiler, the more difficult it is for it.

I'd take a look at your clock-crossing timing constraints, any parts that are optimized out, and check every warning that you get, line-by-line. As long as you set the correct constraints for the negative edge clock, you shouldn't have an issue, but it does matter depending on how you generate the clock!