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Altera_Forum's avatar
Altera_Forum
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13 years ago

How to handle the Hold time is violated?

In my design, after analysis in TimeQuest, there are 4 paths that hold time are violated, the slack time is negative. What is normal approach to handle the case that hold time is violated? Than...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

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Do you have the Fitter option to "Optimize Hold Timing" for "All Paths" turned on? If so, then you may need to over-constrain the failing Hold paths with a set_min_delay constraint.

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Hi, when I firstly compiled, I already had the Fitter option to "Optimize Hold Timing" for "All Paths" turned on. But after I read your post, I realized that my hold time violated is only happening in Fast 0C mode, so I turn on another Fitter option is "Optimize multi-corner timing". Then after I fully complied it again, the hold violated disappear. Should I use that option?

Thanks.