Honored ContributorProbably missing something basic here but I set up a simple simulation with 8 data lines going into 8 d flipflops, a megawizard, with a clock input and 8 data line outputs. I changed several of the input signals to go high using the waveform editing tool in the vector file but when I run the simulation none of the output lines go high, any ideas?
Honored ContributorGot it to work, had a pin functioning as undefined clock so the flipflops were never clocked in the simulation.
Honored ContributorI also have the same problem. I also got the same error. How do I correct it? How do I go about it? I am doing a project on vending machine controller. I am using decoders. And no matter what I do the inputs, I have the same answer for eveything. No changes at all.
Thanks in advanceHonored Contributorare you using a clock? is it properly defined in the simulator?
Honored ContributorI am completely new to Altera. So please be patient with me. How can do you define a clock? I do not think I have defined the clock.
Honored ContributorI've never used the Altera simulator, but basically your clock signal needs to change regularly from 0 to 1 and the flip flops will only update their outputs on the rising edge of the clock. There is probably a button in the waveform creator that can automatically generate a signal that regularly switches from 0 to 1 for you.
Honored ContributorOh yes, I do do that. But no matter how much ever I change the the clock signal to high or low, I get the same result. In some case, it takes the previous output result and then never change despite changing the inputs.
Honored Contributorcould you show us a screenshot of your waveforms?
Honored Contributor
