Forum Discussion

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

zero logic elements used

Hey friends,

I am a beginner in Quartus. I am trying to do a simulation using the simulator in Quartus. I am getting the expected results . However, it shows me that the logic elements or register used are zero!! Does that mean that my entire design is wrong?:confused:

Well, is it because after I accept all my inputs, I need to do some array calculations. I have performed them using registers and then then assigned those registers to outputs. But still it should show me some registers used. Also, some of the inputs values have been assigned in the code itself.

Please help. Thanks in advance!!

Regards

sim007

2 Replies

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

    --- Quote Start ---

    Hey friends,

    it shows me that the logic elements or register used are zero!! Does that mean that my entire design is wrong?

    --- Quote End ---

    1. if your project don`t use register, there are not used register in report - it`s Ok, there is example "voltage level shifting" (http://www.altera.com/support/examples/max/exm-max.html)

    2. if you didn`t connect you resource, there are not used register in report - it`s error
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    You need to ensure there is a clear path from inputs to outputs. Any break is likely to mean all of your logic gets synthesised away.

    It might be a good idea to post up some code you think is causing the problem.