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Mikolaj's avatar
Mikolaj
Icon for New Contributor rankNew Contributor
2 years ago
Solved

Only 0 outputs in waveform simulation

I have a problem with simulating schematics in Quartus II 13.1 Web Edition. I've tried to simulate several projects, but every simulation gives me 0s in the outputs. I remember that I accidentally changed something in the schematic of a specific block, but I don't know exactly what. I'm not sure if that is the problem, but reinstalling doesn't work.

Hdl
Timing
  • FvM's avatar
    FvM
    2 years ago

    Hi,
    circuit behaviour is just as expected.

    You have a quad DFF 74175 connected as circular shift register. All register are initially cleared, shifting "0000" will never result in a nonzero bit.

2 Replies

  • ShengN_altera's avatar
    ShengN_altera
    Icon for Super Contributor rankSuper Contributor
    2 years ago

    Hi,


    Possible to provide the design file for better tracking down the problem?


    Thanks,

    Sheng


  • FvM's avatar
    FvM
    Icon for Super Contributor rankSuper Contributor
    2 years ago

    Hi,
    circuit behaviour is just as expected.

    You have a quad DFF 74175 connected as circular shift register. All register are initially cleared, shifting "0000" will never result in a nonzero bit.