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Fix setup requirement - Innovus/Tempus

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rodrigoluizb

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Hey guys,

I am trying to fix some setup violations in my design. Most of the paths that are violating have a huge setup requirement (not the setup slack), around 350~400ps. I was able to reduce these values by increasing the strength of the capturing flop but it wasn't enough (was reduced by ~100ps). Do you guys have any other suggestions that I can try to solve this problem?

Thanks,
Rodrigo
 

sorry, makes no sense. do you have a spec of 400ps period that you can't meet? why are you doing timing optimizations by hand?
 

The thing is that it is not only a spec I can't meet but it is a value higher than it should be: there are other paths that has a setup req. of ~50ps. I was trying to work on the slew of the clock on both capture and launching flops but I didn't get where I wanted. I am doing this by hand bc I am working on a partition which was designed with unrealistic insertion delay. Now that we are analyzing the top level, there are a couple of viols that showed up. Some of them happen to suffer from this high setup req. values.
 

~50ps is only enough to put something like 2-3 std cells in an advanced technology node. you can't do much with that. if you take setup time away, you are left with ~40ps for a path. it's ridiculously low.

I don't see a solution other than rework the poorly designed parts.
 

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