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gomezramones's avatar
gomezramones
Icon for New Contributor rankNew Contributor
3 years ago
Solved

Problem FSM

There is a problem that when I tried to design a FSM, the code never enters to that part. I simulated the same code in ModelSim and it was working fine. FSM_I2C : process(current_state,next_sta...
  • gomezramones's avatar
    gomezramones
    3 years ago

    The problem was not the triggered in the FSM. When you have a FSM and some signals are going to change in some cases, you need to initialize them at the beginning so the FSM can see signals change in every case possible.

ShengN_altera's avatar
ShengN_altera
Icon for Super Contributor rankSuper Contributor
3 years ago

Hi,

By using the comparison trigger condition, i'm getting the signal tap waveform below (image):

May check out this video https://www.youtube.com/watch?v=WJFKBWCnAB4&t=1026s for the trigger condition details. I had sent the project file to your email.

For those red coloured signals are not in the node list due to being optimized away. But can try to preserve those signals by using keep or preserve attribute check this link https://www.intel.com/content/www/us/en/docs/programmable/683552/18-1/signal-preservation.html. However, I try with keep attribute on next_state signal but that affected the waveform result.

Thanks,

Best regards,

Sheng

p/s: If any answer from the community or Intel Support are helpful, please feel free to give best answer.