Critical Warning: Timing requirements for slow timing model timing analysis were not

Question

Hello,

I am implementing a design in Quartus 2. The compilation gives me:Critical Warning: Timing requirements for slow timing model timing analysis were not met. See Report window for details. I have spend 2 days trying to solve the problem and got from 54 HZ to 62HZ... but I need it to be 64HZ. Can someone clear me on the following topics:

1. How deadly for the design is this critical error... is there a chance that it will refuse to work?

2. How this problem can be fixed?

3. A solution I found is to use different clocks for different modules, what are the possible consequences of this?

Thanks

altera_forum · Answer

Is't setup violation or hold? what device? how big is your design as percentage resource?

altera_forum · Answer

It is a setup violation. Device Cyclone-EP1C12Q240C8. Aprox 8 percent percentage.

altera_forum · Answer

You have most likely long combinatorial paths to those violated registers and it seems they are very long. You need to break that into smaller chunks by adding registers in between. stay on one clock approach.

altera_forum · Answer

ok, thanks. Can you tell how deadly is that?

altera_forum · Answer

very.

but depends on slack. -few ps may be tolerated at some range of temperature. anything > 100 ps will fail but depends on paths involved. The best answer is to run it and see across range of temp.

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Critical Warning: Timing requirements for slow timing model timing analysis were not

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