Forum Discussion

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

encoutered a confusing prob. about its warning

I got a warning :"input pins that donot drive logic".In my project I use a "component" sentence. The problem is when I compile the component only ,that input pin xx work(the warning disappear,I can ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

The problem is surely caused by missing connectivity of the component in the full design. Missing clock, component held inadvertently in permanent reset or no design output depending on the respective component are possible reasons.

Please consider, that minimization of logic is an important feature of a design compiler. Unfortunately it also allows you to remove your complete design logic by omitting just one signal connection.