Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Explanation of "COMP" value in TimeQuest When PLL Is In No Comp Mode

Looking at the "Data Available" report in TimeQuest of a path where the data is launched by a PLL within the design. The PLL is in 'No Compension Mode'. In looking at the delay through the PLL ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

There is always a feedback path delay in the PLL and that is what the “COMP” delay refers to. “No compensation” mode means that the feedback path delay is not guaranteed to be any particular value since the PLL is not trying to compensate any particular clock path (e.g. as in “normal mode” where the PLL tries to make the full clock path delay 0ns).