Forum Discussion

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

Having outputs changes behavior

Why would having outputs change the behavior of a circuit? I'm trying to test whats going on so I put in test outputs to read signals however the behavior of the circuit is different when I have the...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

Just one explanation would be that you have errors in your logic which would cause parts of the circuit to be synthesized out, but when you add outputs as test points those parts would be put back in by the compiler.

Try to use signal probe or signaltap, or better run a simulation in modelsim.