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Altera_Forum
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10 years ago

Facing problems in constraining Negative Setup Slack

Hello all, I am facing problems in constraining Negative Slacks (for a 50Mhz clock and 150MhZ clock both generated clocks). I had a negative slack of -59 which was because of using a 44_24 LPM ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

It is need entire project because timing depend on a lot of things (device, pinout, etc..) but I don't think I have enough time to do your project analysis now. Use Timequest to find what path are failing and then edit design..

You use C8 device.. maybe you can upgrade to a faster speed grade?

Another way is to change phase shift to improve setup times..