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Altera_Forum
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16 years ago

TimeQuest Constraints

I have taken three of the Altera classes for timequest, and it still is not very clear. I have a synchrounous DDR input with both the data and clock aligned with matched lines from the output chip. N...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Found out that timequest does not see an inverted output clock, when using a DDR output register. You either have to put in the generated clock in the SDC or use a PLL output to invert the clock.