Forum Discussion

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

Found pins functioning as undefined clock

Hi, I'm encountering the following "Warning: Found pins functioning as undefined clocks and/or memory enables". I've gone into the "Classic Timing Analysis Settings", set an individual clock ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

--- Quote Start ---

Tricky

Re: Found pins functioning as undefined clock

What version of quartus are you using? you would be far better off using Timequest with SDC constraints

--- Quote End ---

I'm using Quartus 9.0sp2, unfortunately I need to use ACEX1K and this version of quartus is the last one that has compatibility with the ACEX devices.

I worked out what was causing the warning. One of the default settings for the Classic Timing Analyzer is to ignore all user-defined clocks. Once I turned that off the warning went away.